[SC64][SW] Disable writeback prior to jumping to menu code, added SDRAM tests, SC64 reference implementation rewrite

docker_build.sh

@@ -20,8 +20,8 @@ docker run \
     --rm \
     --user $(id -u):$(id -g) \
     --mac-address ${MAC_ADDRESS:-F8:12:34:56:78:90} \
-    --mount type=bind,src="$(pwd)/fw/project/lcmxo2/license.dat",target="/flexlm/license.dat" \
+    -v "$(pwd)"/fw/project/lcmxo2/license.dat:/flexlm/license.dat \
-    --mount type=bind,src="$(pwd)",target="/workdir" \
+    -v "$(pwd)":/workdir \
     -h=`hostname` \
     -e GIT_BRANCH="$GIT_BRANCH" \
     -e GIT_TAG="$GIT_TAG" \

sw/bootloader/N64.ld

@@ -23,12 +23,13 @@ SECTIONS {
         *(.framebuffer .framebuffer.*)
     } > framebuffer
 
-    .text : SUBALIGN(4) {
+    .text : SUBALIGN(8) {
         *(.text.entry_handler)
         *(.text .text.* .gnu.linkonce.t.*)
         *(.assets .assets.*)
         *(.rodata .rodata.* .gnu.linkonce.r.*)
         *(.data .data.* .gnu.linkonce.d.*)
+        . = ALIGN(8);
         _gp = . + 0x8000;
         *(.sdata .sdata.* .gnu.linkonce.s.*)
         *(.lit8 .lit4)

sw/bootloader/src/display.c

@@ -1,3 +1,4 @@
+#include <stdbool.h>
 #include <stdio.h>
 #include "display.h"
 #include "font.h"
@@ -19,6 +20,7 @@
 static io32_t display_framebuffer[SCREEN_WIDTH * SCREEN_HEIGHT] __attribute__((section(".framebuffer, \"aw\", %nobits#")));
 static int char_x;
 static int char_y;
+static bool vi_configured = false;
 static const vi_regs_t vi_config[] = {{
     .CR = VI_CR,
     .H_WIDTH = SCREEN_WIDTH,
@@ -99,6 +101,22 @@ static void display_draw_character (char c) {
         return;
     }
 
+    if (c == '\b') {
+        char_x -= FONT_WIDTH;
+        for (int i = 0; i < (FONT_WIDTH * FONT_HEIGHT); i++) {
+            int c_x = char_x + (i % FONT_WIDTH);
+            int c_y = char_y + (i / FONT_WIDTH);
+
+            if ((c_x >= (SCREEN_WIDTH - BORDER_WIDTH)) || (c_y >= (SCREEN_HEIGHT - BORDER_HEIGHT))) {
+                continue;
+            }
+
+            int screen_offset = c_x + (c_y * SCREEN_WIDTH);
+            cpu_io_write(&display_framebuffer[screen_offset], BACKGROUND_COLOR);
+        }
+        return;
+    }
+
     if ((char_x + FONT_WIDTH) > (SCREEN_WIDTH - BORDER_WIDTH)) {
         char_x = BORDER_WIDTH;
         char_y += FONT_HEIGHT + LINE_SPACING;
@@ -113,7 +131,7 @@ static void display_draw_character (char c) {
         int c_y = char_y + (i / FONT_WIDTH);
 
         if ((c_x >= (SCREEN_WIDTH - BORDER_WIDTH)) || (c_y >= (SCREEN_HEIGHT - BORDER_HEIGHT))) {
-            break;
+            continue;
         }
 
         if (font_data[c - ' '][i / 8] & (1 << (i % 8))) {
@@ -133,8 +151,6 @@ static void display_draw_string (const char *s) {
 
 
 void display_init (uint32_t *background) {
-    const vi_regs_t *cfg = &vi_config[OS_INFO->tv_type];
-
     char_x = BORDER_WIDTH;
     char_y = BORDER_HEIGHT;
 
@@ -144,6 +160,11 @@ void display_init (uint32_t *background) {
         display_clear_background();
     }
 
+    if (!vi_configured) {
+        vi_configured = true;
+
+        const vi_regs_t *cfg = &vi_config[OS_INFO->tv_type];
+
         cpu_io_write(&VI->MADDR, (uint32_t) (display_framebuffer));
         cpu_io_write(&VI->H_WIDTH, cfg->H_WIDTH);
         cpu_io_write(&VI->V_INTR, cfg->V_INTR);
@@ -159,6 +180,7 @@ void display_init (uint32_t *background) {
         cpu_io_write(&VI->V_SCALE, cfg->V_SCALE);
         cpu_io_write(&VI->CR, cfg->CR);
     }
+}
 
 void display_vprintf (const char *fmt, va_list args) {
     char line[256];

sw/bootloader/src/fatfs/diskio.c

@@ -1,6 +1,7 @@
 #include <string.h>
 #include "ff.h"
 #include "diskio.h"
+#include "../error.h"
 #include "../io.h"
 #include "../sc64.h"
 
@@ -15,7 +16,12 @@ DSTATUS disk_status (BYTE pdrv) {
     }
 
     DSTATUS status = 0;
-    sc64_sd_card_status_t sd_card_status = sc64_sd_card_get_status();
+    sc64_error_t error;
+    sc64_sd_card_status_t sd_card_status;
+
+    if ((error = sc64_sd_card_get_status(&sd_card_status)) != SC64_OK) {
+        error_display("Could not get SD card status: %d", error);
+    }
 
     if (!(sd_card_status & SD_CARD_STATUS_INSERTED)) {
         status |= STA_NODISK;
@@ -47,7 +53,7 @@ DRESULT disk_read (BYTE pdrv, BYTE *buff, LBA_t sector, UINT count) {
         while (count > 0) {
             uint32_t blocks = ((count > BUFFER_BLOCKS_MAX) ? BUFFER_BLOCKS_MAX : count);
             size_t length = (blocks * SD_SECTOR_SIZE);
-            if (sc64_sd_read_sectors((uint32_t *) (SC64_BUFFERS->BUFFER), sector, blocks)) {
+            if (sc64_sd_read_sectors((uint32_t *) (SC64_BUFFERS->BUFFER), sector, blocks) != SC64_OK) {
                 return RES_ERROR;
             }
             if (((uint32_t) (buff) % 8) == 0) {
@@ -61,7 +67,7 @@ DRESULT disk_read (BYTE pdrv, BYTE *buff, LBA_t sector, UINT count) {
             count -= blocks;
         }
     } else {
-        if (sc64_sd_read_sectors(physical_address, sector, count)) {
+        if (sc64_sd_read_sectors(physical_address, sector, count) != SC64_OK) {
             return RES_ERROR;
         }
     }
@@ -85,7 +91,7 @@ DRESULT disk_write (BYTE pdrv, const BYTE* buff, LBA_t sector, UINT count) {
                 memcpy(aligned_buffer, buff, length);
                 pi_dma_write((io32_t *) (SC64_BUFFERS->BUFFER), aligned_buffer, length);
             }
-            if (sc64_sd_write_sectors((uint32_t *) (SC64_BUFFERS->BUFFER), sector, blocks)) {
+            if (sc64_sd_write_sectors((uint32_t *) (SC64_BUFFERS->BUFFER), sector, blocks) != SC64_OK) {
                 return RES_ERROR;
             }
             buff += length;
@@ -93,7 +99,7 @@ DRESULT disk_write (BYTE pdrv, const BYTE* buff, LBA_t sector, UINT count) {
             count -= blocks;
         }
     } else {
-        if (sc64_sd_write_sectors(physical_address, sector, count)) {
+        if (sc64_sd_write_sectors(physical_address, sector, count) != SC64_OK) {
             return RES_ERROR;
         }
     }
@@ -112,8 +118,13 @@ DRESULT disk_ioctl (BYTE pdrv, BYTE cmd, void *buff) {
 }
 
 DWORD get_fattime(void) {
+    sc64_error_t error;
     sc64_rtc_time_t t;
-    sc64_get_time(&t);
+
+    if ((error = sc64_get_time(&t)) != SC64_OK) {
+        error_display("Command TIME_GET failed: %d", error);
+    }
+
     return (
         ((FROM_BCD(t.year) + 20) << 25) |
         (FROM_BCD(t.month) << 21) |

sw/bootloader/src/init.c

@@ -6,6 +6,8 @@
 
 
 void init (void) {
+    sc64_error_t error;
+
     uint32_t pifram = si_io_read((io32_t *) (PIFRAM_STATUS));
     si_io_write((io32_t *) (PIFRAM_STATUS), pifram | PIFRAM_TERMINATE_BOOT);
 
@@ -20,12 +22,14 @@ void init (void) {
     exception_enable_watchdog();
     exception_enable_interrupts();
 
+    if ((error = sc64_set_config(CFG_ID_BOOTLOADER_SWITCH, false)) != SC64_OK) {
+        error_display("Command SET_CONFIG [BOOTLOADER_SWITCH] failed: %d", error);
+    }
+
     if (test_check()) {
         exception_disable_watchdog();
         test_execute();
     }
-
-    sc64_set_config(CFG_ID_BOOTLOADER_SWITCH, false);
 }
 
 void deinit (void) {

sw/bootloader/src/io.c

@@ -26,6 +26,27 @@ void cache_inst_hit_invalidate (void *address, size_t length) {
     cache_operation(HIT_INVALIDATE_I, CACHE_LINE_SIZE_I, address, length);
 }
 
+uint32_t c0_count (void) {
+    uint32_t value;
+    asm volatile (
+        "mfc0 %[value], $9 \n" :
+        [value] "=r" (value)
+    );
+    return value;
+}
+
+void delay_ms (int ms) {
+    uint64_t start = c0_count();
+    uint64_t end = start + (ms * ((93750000 / 2) / 1000));
+    uint64_t current;
+    do {
+        current = c0_count();
+        if (current < start) {
+            current += 0x100000000ULL;
+        }
+    } while (current < end);
+}
+
 uint32_t cpu_io_read (io32_t *address) {
     io32_t *uncached = UNCACHED(address);
     uint32_t value = *uncached;
@@ -37,6 +58,15 @@ void cpu_io_write (io32_t *address, uint32_t value) {
     *uncached = value;
 }
 
+void pi_io_config (uint8_t page_size, uint8_t latency, uint8_t pulse_width, uint8_t release) {
+    for (int domain = 0; domain < 2; domain += 1) {
+        cpu_io_write(&PI->DOM[domain].PGS, page_size);
+        cpu_io_write(&PI->DOM[domain].LAT, latency);
+        cpu_io_write(&PI->DOM[domain].PWD, pulse_width);
+        cpu_io_write(&PI->DOM[domain].RLS, release);
+    }
+}
+
 uint32_t pi_busy (void) {
     return (cpu_io_read(&PI->SR) & (PI_SR_IO_BUSY | PI_SR_DMA_BUSY));
 }

sw/bootloader/src/io.h

@@ -254,8 +254,11 @@ typedef struct {
 #define OS_INFO_RESET_TYPE_NMI      (1)
 
 
+uint32_t c0_count (void);
+void delay_ms (int ms);
 uint32_t cpu_io_read (io32_t *address);
 void cpu_io_write (io32_t *address, uint32_t value);
+void pi_io_config (uint8_t page_size, uint8_t latency, uint8_t pulse_width, uint8_t release);
 uint32_t pi_busy (void);
 uint32_t pi_io_read (io32_t *address);
 void pi_io_write (io32_t *address, uint32_t value);

sw/bootloader/src/main.c

@@ -7,10 +7,13 @@
 
 
 void main (void) {
+    sc64_error_t error;
     boot_info_t boot_info;
     sc64_boot_info_t sc64_boot_info;
 
-    sc64_get_boot_info(&sc64_boot_info);
+    if ((error = sc64_get_boot_info(&sc64_boot_info)) != SC64_OK) {
+        error_display("Could not obtain boot info: %d", error);
+    }
 
     switch (sc64_boot_info.boot_mode) {
         case BOOT_MODE_MENU:

sw/bootloader/src/menu.c

@@ -3,6 +3,7 @@
 #include "init.h"
 #include "io.h"
 #include "menu.h"
+#include "sc64.h"
 
 
 extern const void __bootloader_start __attribute__((section(".data")));
@@ -65,6 +66,19 @@ static void menu_check_load_address (void *address, size_t size) {
 
 
 void menu_load_and_run (void) {
+    sc64_error_t error;
+    bool writeback_pending;
+
+    do {
+        if ((error = sc64_writeback_pending(&writeback_pending)) != SC64_OK) {
+            error_display("Command WRITEBACK_PENDING failed: %d", error);
+        }
+    } while (writeback_pending);
+
+    if ((error = sc64_writeback_disable()) != SC64_OK) {
+        error_display("Could not disable writeback: %d", error);
+    }
+
     void (* menu)(void);
     FRESULT fresult;
     FATFS fs;

sw/bootloader/src/sc64.c

@@ -12,6 +12,7 @@ typedef struct {
 #define SC64_REGS_BASE              (0x1FFF0000UL)
 #define SC64_REGS                   ((sc64_regs_t *) SC64_REGS_BASE)
 
+
 #define SC64_SR_IRQ_PENDING         (1 << 29)
 #define SC64_SR_CMD_ERROR           (1 << 30)
 #define SC64_SR_CPU_BUSY            (1 << 31)
@@ -23,29 +24,31 @@ typedef struct {
 #define SC64_KEY_UNLOCK_2           (0x4F434B5FUL)
 #define SC64_KEY_LOCK               (0xFFFFFFFFUL)
 
+
 typedef enum {
-    SC64_CMD_IDENTIFIER_GET     = 'v',
+    CMD_ID_IDENTIFIER_GET       = 'v',
-    SC64_CMD_VERSION_GET        = 'V',
+    CMD_ID_VERSION_GET          = 'V',
-    SC64_CMD_CONFIG_GET         = 'c',
+    CMD_ID_CONFIG_GET           = 'c',
-    SC64_CMD_CONFIG_SET         = 'C',
+    CMD_ID_CONFIG_SET           = 'C',
-    SC64_CMD_SETTING_GET        = 'a',
+    CMD_ID_SETTING_GET          = 'a',
-    SC64_CMD_SETTING_SET        = 'A',
+    CMD_ID_SETTING_SET          = 'A',
-    SC64_CMD_TIME_GET           = 't',
+    CMD_ID_TIME_GET             = 't',
-    SC64_CMD_TIME_SET           = 'T',
+    CMD_ID_TIME_SET             = 'T',
-    SC64_CMD_USB_READ           = 'm',
+    CMD_ID_USB_READ             = 'm',
-    SC64_CMD_USB_WRITE          = 'M',
+    CMD_ID_USB_WRITE            = 'M',
-    SC64_CMD_USB_READ_STATUS    = 'u',
+    CMD_ID_USB_READ_STATUS      = 'u',
-    SC64_CMD_USB_WRITE_STATUS   = 'U',
+    CMD_ID_USB_WRITE_STATUS     = 'U',
-    SC64_CMD_SD_CARD_OP         = 'i',
+    CMD_ID_SD_CARD_OP           = 'i',
-    SC64_CMD_SD_SECTOR_SET      = 'I',
+    CMD_ID_SD_SECTOR_SET        = 'I',
-    SC64_CMD_SD_READ            = 's',
+    CMD_ID_SD_READ              = 's',
-    SC64_CMD_SD_WRITE           = 'S',
+    CMD_ID_SD_WRITE             = 'S',
-    SC64_CMD_DD_SD_INFO         = 'D',
+    CMD_ID_DD_SD_INFO           = 'D',
-    SC64_CMD_WRITEBACK_SD_INFO  = 'W',
+    CMD_ID_WRITEBACK_PENDING    = 'w',
-    SC64_CMD_FLASH_PROGRAM      = 'K',
+    CMD_ID_WRITEBACK_SD_INFO    = 'W',
-    SC64_CMD_FLASH_WAIT_BUSY    = 'p',
+    CMD_ID_FLASH_PROGRAM        = 'K',
-    SC64_CMD_FLASH_ERASE_BLOCK  = 'P',
+    CMD_ID_FLASH_WAIT_BUSY      = 'p',
-} cmd_id_t;
+    CMD_ID_FLASH_ERASE_BLOCK    = 'P',
+} sc64_cmd_id_t;
 
 typedef enum {
     SD_CARD_OP_DEINIT = 0,
@@ -56,37 +59,35 @@ typedef enum {
     SD_CARD_OP_BYTE_SWAP_OFF = 5,
 } sd_card_op_t;
 
+typedef struct {
+    sc64_cmd_id_t id;
+    uint32_t arg[2];
+    uint32_t rsp[2];
+} sc64_cmd_t;
+
+
+static sc64_error_t sc64_execute_cmd (sc64_cmd_t *cmd) {
+    pi_io_write(&SC64_REGS->DATA[0], cmd->arg[0]);
+    pi_io_write(&SC64_REGS->DATA[1], cmd->arg[1]);
+
+    pi_io_write(&SC64_REGS->SR_CMD, (cmd->id & 0xFF));
 
-static bool sc64_wait_cpu_busy (void) {
     uint32_t sr;
     do {
         sr = pi_io_read(&SC64_REGS->SR_CMD);
     } while (sr & SC64_SR_CPU_BUSY);
-    return (sr & SC64_SR_CMD_ERROR);
-}
 
-static bool sc64_execute_cmd (uint8_t cmd, uint32_t *args, uint32_t *result) {
+    if (sr & SC64_SR_CMD_ERROR) {
-    if (args != NULL) {
-        pi_io_write(&SC64_REGS->DATA[0], args[0]);
-        pi_io_write(&SC64_REGS->DATA[1], args[1]);
-    }
-    pi_io_write(&SC64_REGS->SR_CMD, ((uint32_t) (cmd)) & 0xFF);
-    bool error = sc64_wait_cpu_busy();
-    if (result != NULL) {
-        result[0] = pi_io_read(&SC64_REGS->DATA[0]);
-        result[1] = pi_io_read(&SC64_REGS->DATA[1]);
-    }
-    return error;
-}
-
-
-sc64_error_t sc64_get_error (void) {
-    if (pi_io_read(&SC64_REGS->SR_CMD) & SC64_SR_CMD_ERROR) {
         return (sc64_error_t) (pi_io_read(&SC64_REGS->DATA[0]));
     }
+
+    cmd->rsp[0] = pi_io_read(&SC64_REGS->DATA[0]);
+    cmd->rsp[1] = pi_io_read(&SC64_REGS->DATA[1]);
+
     return SC64_OK;
 }
 
+
 void sc64_unlock (void) {
     pi_io_write(&SC64_REGS->KEY, SC64_KEY_RESET);
     pi_io_write(&SC64_REGS->KEY, SC64_KEY_UNLOCK_1);
@@ -99,204 +100,334 @@ void sc64_lock (void) {
 }
 
 bool sc64_check_presence (void) {
-    uint32_t identifier = pi_io_read(&SC64_REGS->IDENTIFIER);
+    bool detected = (pi_io_read(&SC64_REGS->IDENTIFIER) == SC64_V2_IDENTIFIER);
-    if (identifier == SC64_V2_IDENTIFIER) {
+    if (detected) {
-        sc64_wait_cpu_busy();
+        while (pi_io_read(&SC64_REGS->SR_CMD) & SC64_SR_CPU_BUSY);
-        return true;
     }
-    return false;
+    return detected;
 }
 
+
 bool sc64_irq_pending (void) {
-    if (pi_io_read(&SC64_REGS->SR_CMD) & SC64_SR_IRQ_PENDING) {
+    return (pi_io_read(&SC64_REGS->SR_CMD) & SC64_SR_IRQ_PENDING);
-        return true;
-    }
-    return false;
 }
 
 void sc64_irq_clear (void) {
     pi_io_write(&SC64_REGS->IDENTIFIER, 0);
 }
 
-uint32_t sc64_get_config (sc64_cfg_id_t id) {
-    uint32_t args[2] = { id, 0 };
-    uint32_t result[2];
-    sc64_execute_cmd(SC64_CMD_CONFIG_GET, args, result);
-    return result[1];
-}
 
-void sc64_set_config (sc64_cfg_id_t id, uint32_t value) {
+sc64_error_t sc64_get_identifier (uint32_t *identifier) {
-    uint32_t args[2] = { id, value };
+    sc64_cmd_t cmd = {
-    sc64_execute_cmd(SC64_CMD_CONFIG_SET, args, NULL);
+        .id = CMD_ID_IDENTIFIER_GET
-}
-
-uint32_t sc64_get_setting (sc64_setting_id_t id) {
-    uint32_t args[2] = { id, 0 };
-    uint32_t result[2];
-    sc64_execute_cmd(SC64_CMD_SETTING_GET, args, result);
-    return result[1];
-}
-
-void sc64_set_setting (sc64_setting_id_t id, uint32_t value) {
-    uint32_t args[2] = { id, value };
-    sc64_execute_cmd(SC64_CMD_SETTING_SET, args, NULL);
-}
-
-void sc64_get_boot_info (sc64_boot_info_t *info) {
-    info->boot_mode = (sc64_boot_mode_t) sc64_get_config(CFG_ID_BOOT_MODE);
-    info->cic_seed = (sc64_cic_seed_t) sc64_get_config(CFG_ID_CIC_SEED);
-    info->tv_type = (sc64_tv_type_t) sc64_get_config(CFG_ID_TV_TYPE);
-}
-
-void sc64_get_time (sc64_rtc_time_t *t) {
-    uint32_t result[2];
-    sc64_execute_cmd(SC64_CMD_TIME_GET, NULL, result);
-    t->second = (result[0] & 0xFF);
-    t->minute = ((result[0] >> 8) & 0xFF);
-    t->hour = ((result[0] >> 16) & 0xFF);
-    t->weekday = ((result[1] >> 24) & 0xFF);
-    t->day = (result[1] & 0xFF);
-    t->month = ((result[1] >> 8) & 0xFF);
-    t->year = ((result[1] >> 16) & 0xFF);
-}
-
-void sc64_set_time (sc64_rtc_time_t *t) {
-    uint32_t args[2] = {
-        ((t->hour << 16) | (t->minute << 8) | t->second),
-        ((t->weekday << 24) | (t->year << 16) | (t->month << 8) | t->day),
     };
-    sc64_execute_cmd(SC64_CMD_TIME_SET, args, NULL);
+    sc64_error_t error = sc64_execute_cmd(&cmd);
+    *identifier = cmd.rsp[0];
+    return error;
 }
 
-bool sc64_usb_read_ready (uint8_t *type, uint32_t *length) {
+sc64_error_t sc64_get_version (uint16_t *major, uint16_t *minor, uint32_t *revision) {
-    uint32_t result[2];
+    sc64_cmd_t cmd = {
-    sc64_execute_cmd(SC64_CMD_USB_READ_STATUS, NULL, result);
+        .id = CMD_ID_VERSION_GET
-    if (type != NULL) {
+    };
-        *type = result[0] & 0xFF;
+    sc64_error_t error = sc64_execute_cmd(&cmd);
-    }
+    *major = ((cmd.rsp[0] >> 16) & 0xFFFF);
-    if (length != NULL) {
+    *minor = (cmd.rsp[0] & 0xFFFF);
-        *length = result[1];
+    *revision = cmd.rsp[1];
-    }
+    return error;
-    return (result[1] > 0);
 }
 
-bool sc64_usb_read (void *address, uint32_t length) {
+
-    uint32_t args[2] = { (uint32_t) (address), length };
+sc64_error_t sc64_get_config (sc64_cfg_id_t id, uint32_t *value) {
-    uint32_t result[2];
+    sc64_cmd_t cmd = {
-    if (sc64_execute_cmd(SC64_CMD_USB_READ, args, NULL)) {
+        .id = CMD_ID_CONFIG_GET,
-        return true;
+        .arg = { id }
-    }
+    };
-    do {
+    sc64_error_t error = sc64_execute_cmd(&cmd);
-        sc64_execute_cmd(SC64_CMD_USB_READ_STATUS, NULL, result);
+    *value = cmd.rsp[1];
-    } while(result[0] & (1 << 31));
+    return error;
-    return false;
 }
 
-bool sc64_usb_write_ready (void) {
+sc64_error_t sc64_set_config (sc64_cfg_id_t id, uint32_t value) {
-    uint32_t result[2];
+    sc64_cmd_t cmd = {
-    sc64_execute_cmd(SC64_CMD_USB_WRITE_STATUS, NULL, result);
+        .id = CMD_ID_CONFIG_SET,
-    return (!(result[0] & (1 << 31)));
+        .arg = { id, value }
+    };
+    return sc64_execute_cmd(&cmd);
 }
 
-bool sc64_usb_write (void *address, uint8_t type, uint32_t length) {
+sc64_error_t sc64_get_setting (sc64_setting_id_t id, uint32_t *value) {
-    while (!sc64_usb_write_ready());
+    sc64_cmd_t cmd = {
-    uint32_t args[2] = { (uint32_t) (address), ((type << 24) | (length & 0xFFFFFF)) };
+        .id = CMD_ID_SETTING_GET,
-    return sc64_execute_cmd(SC64_CMD_USB_WRITE, args, NULL);
+        .arg = { id }
+    };
+    sc64_error_t error = sc64_execute_cmd(&cmd);
+    *value = cmd.rsp[1];
+    return error;
 }
 
-bool sc64_sd_card_init (void) {
+sc64_error_t sc64_set_setting (sc64_setting_id_t id, uint32_t value) {
-    uint32_t args[2] = { (uint32_t) (NULL), SD_CARD_OP_INIT };
+    sc64_cmd_t cmd = {
-    if (sc64_execute_cmd(SC64_CMD_SD_CARD_OP, args, NULL)) {
+        .id = CMD_ID_SETTING_SET,
-        return true;
+        .arg = { id, value }
-    }
+    };
-    return false;
+    return sc64_execute_cmd(&cmd);
 }
 
-bool sc64_sd_card_deinit (void) {
+sc64_error_t sc64_get_boot_info (sc64_boot_info_t *info) {
-    uint32_t args[2] = { (uint32_t) (NULL), SD_CARD_OP_DEINIT };
+    sc64_error_t error;
-    if (sc64_execute_cmd(SC64_CMD_SD_CARD_OP, args, NULL)) {
+    uint32_t value;
-        return true;
+
+    if ((error = sc64_get_config(CFG_ID_BOOT_MODE, &value)) != SC64_OK) {
+        return error;
     }
-    return false;
+    info->boot_mode = value;
+
+    if ((error = sc64_get_config(CFG_ID_CIC_SEED, &value)) != SC64_OK) {
+        return error;
+    }
+    info->cic_seed = value;
+
+    if ((error = sc64_get_config(CFG_ID_TV_TYPE, &value)) != SC64_OK) {
+        return error;
+    }
+    info->tv_type = value;
+
+    return SC64_OK;
 }
 
-sc64_sd_card_status_t sc64_sd_card_get_status (void) {
+
-    uint32_t args[2] = { (uint32_t) (NULL), SD_CARD_OP_GET_STATUS };
+sc64_error_t sc64_get_time (sc64_rtc_time_t *t) {
-    uint32_t result[2];
+    sc64_cmd_t cmd = {
-    if (sc64_execute_cmd(SC64_CMD_SD_CARD_OP, args, result)) {
+        .id = CMD_ID_TIME_GET
-        return false;
+    };
-    }
+    sc64_error_t error = sc64_execute_cmd(&cmd);
-    return (sc64_sd_card_status_t) (result[1]);
+    t->hour = ((cmd.rsp[0] >> 16) & 0xFF);
+    t->minute = ((cmd.rsp[0] >> 8) & 0xFF);
+    t->second = (cmd.rsp[0] & 0xFF);
+    t->weekday = ((cmd.rsp[1] >> 24) & 0xFF);
+    t->year = ((cmd.rsp[1] >> 16) & 0xFF);
+    t->month = ((cmd.rsp[1] >> 8) & 0xFF);
+    t->day = (cmd.rsp[1] & 0xFF);
+    return error;
 }
 
-bool sc64_sd_card_get_info (void *address) {
+sc64_error_t sc64_set_time (sc64_rtc_time_t *t) {
-    uint32_t args[2] = { (uint32_t) (address), SD_CARD_OP_GET_INFO };
+    uint32_t time[2] = {(
-    if (sc64_execute_cmd(SC64_CMD_SD_CARD_OP, args, NULL)) {
+        ((t->hour << 16) & 0xFF) |
-        return true;
+        ((t->minute << 8) & 0xFF) |
-    }
+        (t->second & 0xFF)
-    return false;
+    ), (
+        ((t->weekday << 24) & 0xFF) |
+        ((t->year << 16) & 0xFF) |
+        ((t->month << 8) & 0xFF) |
+        (t->day & 0xFF)
+    )};
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_TIME_SET,
+        .arg = { time[0], time[1] }
+    };
+    return sc64_execute_cmd(&cmd);
 }
 
-bool sc64_sd_set_byte_swap (bool enabled) {
+
-    uint32_t args[2] = { (uint32_t) (NULL), enabled ? SD_CARD_OP_BYTE_SWAP_ON : SD_CARD_OP_BYTE_SWAP_OFF };
+sc64_error_t sc64_usb_get_status (bool *reset_state, bool *cable_unplugged) {
-    if (sc64_execute_cmd(SC64_CMD_SD_CARD_OP, args, NULL)) {
+    sc64_cmd_t cmd = {
-        return true;
+        .id = CMD_ID_USB_READ_STATUS,
-    }
+    };
-    return false;
+    sc64_error_t error = sc64_execute_cmd(&cmd);
+    *reset_state = (bool) (cmd.rsp[0] & (1 << 30));
+    *cable_unplugged = (bool) (cmd.rsp[0] & (1 << 29));
+    return error;
 }
 
-bool sc64_sd_read_sectors (void *address, uint32_t sector, uint32_t count) {
+sc64_error_t sc64_usb_read_info (uint8_t *type, uint32_t *length) {
-    uint32_t sector_set_args[2] = { sector, 0 };
+    sc64_cmd_t cmd = {
-    uint32_t read_args[2] = { (uint32_t) (address), count };
+        .id = CMD_ID_USB_READ_STATUS,
-    if (sc64_execute_cmd(SC64_CMD_SD_SECTOR_SET, sector_set_args, NULL)) {
+    };
-        return true;
+    sc64_error_t error = sc64_execute_cmd(&cmd);
-    }
+    *type = (cmd.rsp[0] & 0xFF);
-    return sc64_execute_cmd(SC64_CMD_SD_READ, read_args, NULL);
+    *length = cmd.rsp[1];
+    return error;
 }
 
-bool sc64_sd_write_sectors (void *address, uint32_t sector, uint32_t count) {
+sc64_error_t sc64_usb_read_busy (bool *read_busy) {
-    uint32_t sector_set_args[2] = { sector, 0 };
+    sc64_cmd_t cmd = {
-    uint32_t write_args[2] = { (uint32_t) (address), count };
+        .id = CMD_ID_USB_READ_STATUS,
-    if (sc64_execute_cmd(SC64_CMD_SD_SECTOR_SET, sector_set_args, NULL)) {
+    };
-        return true;
+    sc64_error_t error = sc64_execute_cmd(&cmd);
-    }
+    *read_busy = (bool) (cmd.rsp[0] & (1 << 31));
-    return sc64_execute_cmd(SC64_CMD_SD_WRITE, write_args, NULL);
+    return error;
 }
 
-bool sc64_dd_set_sd_info (void *address, uint32_t length) {
+sc64_error_t sc64_usb_write_busy (bool *write_busy) {
-    uint32_t args[2] = { (uint32_t) (address), length };
+    sc64_cmd_t cmd = {
-    if (sc64_execute_cmd(SC64_CMD_DD_SD_INFO, args, NULL)) {
+        .id = CMD_ID_USB_WRITE_STATUS,
-        return true;
+    };
-    }
+    sc64_error_t error = sc64_execute_cmd(&cmd);
-    return false;
+    *write_busy = (bool) (cmd.rsp[0] & (1 << 31));
+    return error;
 }
 
-bool sc64_writeback_enable (void *address) {
+sc64_error_t sc64_usb_read (void *address, uint32_t length) {
-    uint32_t args[2] = { (uint32_t) (address), 0 };
+    sc64_cmd_t cmd = {
-    if (sc64_execute_cmd(SC64_CMD_WRITEBACK_SD_INFO, args, NULL)) {
+        .id = CMD_ID_USB_READ,
-        return true;
+        .arg = { (uint32_t) (address), length }
-    }
+    };
-    return false;
+    return sc64_execute_cmd(&cmd);
 }
 
-bool sc64_flash_program (void *address, uint32_t length) {
+sc64_error_t sc64_usb_write (void *address, uint8_t type, uint32_t length) {
-    uint32_t args[2] = { (uint32_t) (address), length };
+    sc64_cmd_t cmd = {
-    return sc64_execute_cmd(SC64_CMD_FLASH_PROGRAM, args, NULL);
+        .id = CMD_ID_USB_WRITE,
+        .arg = { (uint32_t) (address), ((type << 24) | (length & 0xFFFFFF)) }
+    };
+    return sc64_execute_cmd(&cmd);
 }
 
-void sc64_flash_wait_busy (void) {
+
-    uint32_t args[2] = { true, 0 };
+sc64_error_t sc64_sd_card_init (void) {
-    sc64_execute_cmd(SC64_CMD_FLASH_WAIT_BUSY, args, NULL);
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_SD_CARD_OP,
+        .arg = { (uint32_t) (NULL), SD_CARD_OP_INIT }
+    };
+    return sc64_execute_cmd(&cmd);
 }
 
-uint32_t sc64_flash_get_erase_block_size (void) {
+sc64_error_t sc64_sd_card_deinit (void) {
-    uint32_t args[2] = { false, 0 };
+    sc64_cmd_t cmd = {
-    uint32_t result[2];
+        .id = CMD_ID_SD_CARD_OP,
-    sc64_execute_cmd(SC64_CMD_FLASH_WAIT_BUSY, args, result);
+        .arg = { (uint32_t) (NULL), SD_CARD_OP_DEINIT }
-    return result[0];
+    };
+    return sc64_execute_cmd(&cmd);
 }
 
-bool sc64_flash_erase_block (void *address) {
+sc64_error_t sc64_sd_card_get_status (sc64_sd_card_status_t *sd_card_status) {
-    uint32_t args[2] = { (uint32_t) (address), 0 };
+    sc64_cmd_t cmd = {
-    return sc64_execute_cmd(SC64_CMD_FLASH_ERASE_BLOCK, args, NULL);
+        .id = CMD_ID_SD_CARD_OP,
+        .arg = { (uint32_t) (NULL), SD_CARD_OP_GET_STATUS }
+    };
+    sc64_error_t error = sc64_execute_cmd(&cmd);
+    *sd_card_status = (sc64_sd_card_status_t) (cmd.rsp[1]);
+    return error;
+}
+
+sc64_error_t sc64_sd_card_get_info (void *address) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_SD_CARD_OP,
+        .arg = { (uint32_t) (address), SD_CARD_OP_GET_INFO }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+sc64_error_t sc64_sd_set_byte_swap (bool enabled) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_SD_CARD_OP,
+        .arg = { (uint32_t) (NULL), enabled ? SD_CARD_OP_BYTE_SWAP_ON : SD_CARD_OP_BYTE_SWAP_OFF }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+static sc64_error_t sc64_sd_sector_set (uint32_t sector) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_SD_SECTOR_SET,
+        .arg = { sector }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+sc64_error_t sc64_sd_read_sectors (void *address, uint32_t sector, uint32_t count) {
+    sc64_error_t error;
+    if ((error = sc64_sd_sector_set(sector)) != SC64_OK) {
+        return error;
+    }
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_SD_READ,
+        .arg = { (uint32_t) (address), count }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+sc64_error_t sc64_sd_write_sectors (void *address, uint32_t sector, uint32_t count) {
+    sc64_error_t error;
+    if ((error = sc64_sd_sector_set(sector)) != SC64_OK) {
+        return error;
+    }
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_SD_WRITE,
+        .arg = { (uint32_t) (address), count }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+
+sc64_error_t sc64_dd_set_sd_info (void *address, uint32_t length) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_DD_SD_INFO,
+        .arg = { (uint32_t) (address), length }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+
+sc64_error_t sc64_writeback_pending (bool *pending) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_WRITEBACK_PENDING
+    };
+    sc64_error_t error = sc64_execute_cmd(&cmd);
+    *pending = (cmd.rsp[0] != 0);
+    return error;
+}
+
+sc64_error_t sc64_writeback_enable (void *address) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_WRITEBACK_SD_INFO,
+        .arg = { (uint32_t) (address) }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+sc64_error_t sc64_writeback_disable (void) {
+    sc64_error_t error;
+    uint32_t save_type;
+    error = sc64_get_config(CFG_ID_SAVE_TYPE, &save_type);
+    if (error != SC64_OK) {
+        return error;
+    }
+    return sc64_set_config(CFG_ID_SAVE_TYPE, save_type);
+}
+
+
+sc64_error_t sc64_flash_program (void *address, uint32_t length) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_FLASH_PROGRAM,
+        .arg = { (uint32_t) (address), length }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+sc64_error_t sc64_flash_wait_busy (void) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_FLASH_WAIT_BUSY,
+        .arg = { true }
+    };
+    return sc64_execute_cmd(&cmd);
+}
+
+sc64_error_t sc64_flash_get_erase_block_size (size_t *erase_block_size) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_FLASH_WAIT_BUSY,
+        .arg = { false }
+    };
+    sc64_error_t error = sc64_execute_cmd(&cmd);
+    *erase_block_size = (size_t) (cmd.rsp[0]);
+    return error;
+}
+
+sc64_error_t sc64_flash_erase_block (void *address) {
+    sc64_cmd_t cmd = {
+        .id = CMD_ID_FLASH_ERASE_BLOCK,
+        .arg = { (uint32_t) (address) }
+    };
+    return sc64_execute_cmd(&cmd);
 }

sw/bootloader/src/sc64.h

@@ -21,7 +21,7 @@ typedef enum {
     CFG_ID_ROM_WRITE_ENABLE,
     CFG_ID_ROM_SHADOW_ENABLE,
     CFG_ID_DD_MODE,
-    CFG_ID_ISV_ENABLE,
+    CFG_ID_ISV_ADDRESS,
     CFG_ID_BOOT_MODE,
     CFG_ID_SAVE_TYPE,
     CFG_ID_CIC_SEED,
@@ -74,6 +74,17 @@ typedef enum {
     TV_TYPE_PASSTHROUGH = 3
 } sc64_tv_type_t;
 
+typedef enum {
+    DRIVE_TYPE_RETAIL,
+    DRIVE_TYPE_DEVELOPMENT,
+} sc64_drive_type_t;
+
+typedef enum {
+    DISK_STATE_EJECTED,
+    DISK_STATE_INSERTED,
+    DISK_STATE_CHANGED,
+} sc64_disk_state_t;
+
 typedef enum {
     BUTTON_MODE_NONE,
     BUTTON_MODE_N64_IRQ,
@@ -81,14 +92,6 @@ typedef enum {
     BUTTON_MODE_DD_DISK_SWAP,
 } sc64_button_mode_t;
 
-typedef enum {
-    SD_CARD_STATUS_INSERTED = (1 << 0),
-    SD_CARD_STATUS_INITIALIZED = (1 << 1),
-    SD_CARD_STATUS_TYPE_BLOCK = (1 << 2),
-    SD_CARD_STATUS_50MHZ_MODE = (1 << 3),
-    SD_CARD_STATUS_BYTE_SWAP = (1 << 4),
-} sc64_sd_card_status_t;
-
 typedef struct {
     sc64_boot_mode_t boot_mode;
     sc64_cic_seed_t cic_seed;
@@ -105,6 +108,14 @@ typedef struct {
     uint8_t year;
 } sc64_rtc_time_t;
 
+typedef enum {
+    SD_CARD_STATUS_INSERTED = (1 << 0),
+    SD_CARD_STATUS_INITIALIZED = (1 << 1),
+    SD_CARD_STATUS_TYPE_BLOCK = (1 << 2),
+    SD_CARD_STATUS_50MHZ_MODE = (1 << 3),
+    SD_CARD_STATUS_BYTE_SWAP = (1 << 4),
+} sc64_sd_card_status_t;
+
 
 typedef struct {
     volatile uint8_t BUFFER[8192];
@@ -117,8 +128,6 @@ typedef struct {
 #define SC64_BUFFERS        ((sc64_buffers_t *) SC64_BUFFERS_BASE)
 
 
-sc64_error_t sc64_get_error (void);
-
 void sc64_unlock (void);
 void sc64_lock (void);
 bool sc64_check_presence (void);
@@ -126,34 +135,43 @@ bool sc64_check_presence (void);
 bool sc64_irq_pending (void);
 void sc64_irq_clear (void);
 
-uint32_t sc64_get_config (sc64_cfg_id_t id);
+sc64_error_t sc64_get_identifier (uint32_t *identifier);
-void sc64_set_config (sc64_cfg_id_t id, uint32_t value);
+sc64_error_t sc64_get_version (uint16_t *major, uint16_t *minor, uint32_t *revision);
-uint32_t sc64_get_setting (sc64_setting_id_t id);
-void sc64_set_setting (sc64_setting_id_t id, uint32_t value);
-void sc64_get_boot_info (sc64_boot_info_t *info);
 
-void sc64_get_time (sc64_rtc_time_t *t);
+sc64_error_t sc64_get_config (sc64_cfg_id_t id, uint32_t *value);
-void sc64_set_time (sc64_rtc_time_t *t);
+sc64_error_t sc64_set_config (sc64_cfg_id_t id, uint32_t value);
+sc64_error_t sc64_get_setting (sc64_setting_id_t id, uint32_t *value);
+sc64_error_t sc64_set_setting (sc64_setting_id_t id, uint32_t value);
+sc64_error_t sc64_get_boot_info (sc64_boot_info_t *info);
 
-bool sc64_usb_read_ready (uint8_t *type, uint32_t *length);
+sc64_error_t sc64_get_time (sc64_rtc_time_t *t);
-bool sc64_usb_read (void *address, uint32_t length);
+sc64_error_t sc64_set_time (sc64_rtc_time_t *t);
-bool sc64_usb_write_ready (void);
-bool sc64_usb_write (void *address, uint8_t type, uint32_t length);
 
-bool sc64_sd_card_init (void);
+sc64_error_t sc64_usb_get_status (bool *reset_state, bool *cable_unplugged);
-bool sc64_sd_card_deinit (void);
+sc64_error_t sc64_usb_read_info (uint8_t *type, uint32_t *length);
-sc64_sd_card_status_t sc64_sd_card_get_status (void);
+sc64_error_t sc64_usb_read_busy (bool *read_busy);
-bool sc64_sd_card_get_info (void *address);
+sc64_error_t sc64_usb_write_busy (bool *write_busy);
-bool sc64_sd_set_byte_swap (bool enabled);
+sc64_error_t sc64_usb_read (void *address, uint32_t length);
-bool sc64_sd_write_sectors (void *address, uint32_t sector, uint32_t count);
+sc64_error_t sc64_usb_write (void *address, uint8_t type, uint32_t length);
-bool sc64_sd_read_sectors (void *address, uint32_t sector, uint32_t count);
-bool sc64_dd_set_sd_disk_info (void *address, uint32_t length);
-bool sc64_writeback_enable (void *address);
 
-bool sc64_flash_program (void *address, uint32_t length);
+sc64_error_t sc64_sd_card_init (void);
-void sc64_flash_wait_busy (void);
+sc64_error_t sc64_sd_card_deinit (void);
-uint32_t sc64_flash_get_erase_block_size (void);
+sc64_error_t sc64_sd_card_get_status (sc64_sd_card_status_t *sd_card_status);
-bool sc64_flash_erase_block (void *address);
+sc64_error_t sc64_sd_card_get_info (void *address);
+sc64_error_t sc64_sd_set_byte_swap (bool enabled);
+sc64_error_t sc64_sd_read_sectors (void *address, uint32_t sector, uint32_t count);
+sc64_error_t sc64_sd_write_sectors (void *address, uint32_t sector, uint32_t count);
+
+sc64_error_t sc64_dd_set_sd_info (void *address, uint32_t length);
+
+sc64_error_t sc64_writeback_pending (bool *pending);
+sc64_error_t sc64_writeback_enable (void *address);
+sc64_error_t sc64_writeback_disable (void);
+
+sc64_error_t sc64_flash_program (void *address, uint32_t length);
+sc64_error_t sc64_flash_wait_busy (void);
+sc64_error_t sc64_flash_get_erase_block_size (size_t *erase_block_size);
+sc64_error_t sc64_flash_erase_block (void *address);
 
 
 #endif

sw/bootloader/src/test.c

@@ -1,12 +1,38 @@
 #include <stddef.h>
+#include <stdlib.h>
 #include "display.h"
+#include "error.h"
 #include "io.h"
 #include "sc64.h"
 #include "test.h"
 
 
+static void test_sc64_cfg (void) {
+    sc64_error_t error;
+    uint32_t identifier;
+    uint16_t major;
+    uint16_t minor;
+    uint32_t revision;
+
+    if ((error = sc64_get_identifier(&identifier)) != SC64_OK) {
+        error_display("Command IDENTIFIER_GET failed: %d", error);
+        return;
+    }
+    
+    if ((error = sc64_get_version(&major, &minor, &revision)) != SC64_OK) {
+        error_display("Command VERSION_GET failed: %d", error);
+        return;
+    }
+
+    display_printf("Identifier: 0x%08X\n\n", identifier);
+
+    display_printf("SC64 firmware version: %d.%d.%d\n", major, minor, revision);
+}
+
 static void test_rtc (void) {
+    sc64_error_t error;
     sc64_rtc_time_t t;
+
     const char *weekdays[8] = {
         "",
         "Monday",
@@ -18,7 +44,9 @@ static void test_rtc (void) {
         "Sunday",
     };
 
-    sc64_get_time(&t);
+    if ((error = sc64_get_time(&t)) != SC64_OK) {
+        error_display("Command TIME_GET failed: %d", error);
+    }
 
     display_printf("RTC current time:\n ");
     display_printf("%04d-%02d-%02d", 2000 + FROM_BCD(t.year), FROM_BCD(t.month), FROM_BCD(t.day));
@@ -29,11 +57,14 @@ static void test_rtc (void) {
 }
 
 static void test_sd_card (void) {
+    sc64_error_t error;
     sc64_sd_card_status_t card_status;
     uint8_t card_info[32] __attribute__((aligned(8)));
     uint8_t sector[512] __attribute__((aligned(8)));
 
-    card_status = sc64_sd_card_get_status();
+    if ((error = sc64_sd_card_get_status(&card_status)) != SC64_OK) {
+        error_display("Could not get SD card info: %d", error);
+    }
 
     if (card_status & SD_CARD_STATUS_INSERTED) {
         display_printf("SD card is inserted\n");
@@ -41,12 +72,14 @@ static void test_sd_card (void) {
         display_printf("SD card is not inserted\n");
     }
 
-    if (sc64_sd_card_init()) {
+    if ((error = sc64_sd_card_init()) != SC64_OK) {
-        display_printf("SD card init error!\n");
+        display_printf("SD card init error: %d\n", error);
         return;
     }
 
-    card_status = sc64_sd_card_get_status();
+    if ((error = sc64_sd_card_get_status(&card_status)) != SC64_OK) {
+        error_display("Could not get SD card info: %d", error);
+    }
 
     if (card_status & SD_CARD_STATUS_INITIALIZED) {
         display_printf("SD card is initialized\n");
@@ -61,8 +94,8 @@ static void test_sd_card (void) {
         display_printf("SD card read byte swap is enabled\n");
     }
 
-    if (sc64_sd_card_get_info((uint32_t *) (SC64_BUFFERS->BUFFER))) {
+    if ((error = sc64_sd_card_get_info((uint32_t *) (SC64_BUFFERS->BUFFER))) != SC64_OK) {
-        display_printf("SD card get info error!\n");
+        display_printf("SD card get info error: %d\n", error);
         return;
     }
 
@@ -82,8 +115,8 @@ static void test_sd_card (void) {
     }
     display_printf("\n");
 
-    if (sc64_sd_read_sectors((void *) (SC64_BUFFERS->BUFFER), 0, 1)) {
+    if ((error = sc64_sd_read_sectors((void *) (SC64_BUFFERS->BUFFER), 0, 1)) != SC64_OK) {
-        display_printf("SD card read sector 0 error!\n");
+        display_printf("SD card read sector 0 error: %d\n", error);
         return;
     }
 
@@ -101,25 +134,138 @@ static void test_sd_card (void) {
     display_printf(" Boot signature: 0x%02X%02X\n", sector[510], sector[511]);
 }
 
+#define SDRAM_ADDRESS   (0x10000000)
+#define SDRAM_SIZE      (64 * 1024 * 1024)
+#define BUFFER_SIZE     (128 * 1024)
+
+static uint32_t w_buffer[BUFFER_SIZE / sizeof(uint32_t)] __attribute__((aligned(8)));
+static uint32_t r_buffer[BUFFER_SIZE / sizeof(uint32_t)] __attribute__((aligned(8)));
+
+static void test_sdram (void) {
+    sc64_error_t error;
+
+    if ((error = sc64_set_config(CFG_ID_ROM_WRITE_ENABLE, true))) {
+        error_display("Command CONFIG_SET [ROM_WRITE_ENABLE] failed: %d", error);
+        return;
+    }
+
+    if ((error = sc64_set_config(CFG_ID_ROM_SHADOW_ENABLE, false))) {
+        error_display("Command CONFIG_SET [ROM_SHADOW_ENABLE] failed: %d", error);
+        return;
+    }
+
+    pi_io_config(0x0B, 0x05, 0x0C, 0x02);
+    display_printf("PI config - PGS: 0x0B, LAT: 0x05, PWD: 0x0C, RLS: 0x02\n");
+
+    const struct patterns_s {
+        bool constant;
+        uint32_t value;
+    } patterns[] = {
+        { .constant = true, .value = 0x00000000 },
+        { .constant = true, .value = 0xFFFFFFFF },
+        { .constant = true, .value = 0xFFFF0000 },
+        { .constant = true, .value = 0x0000FFFF },
+        { .constant = true, .value = 0xF0F0F0F0 },
+        { .constant = true, .value = 0x0F0F0F0F },
+        { .constant = true, .value = 0xAAAAAAAA },
+        { .constant = true, .value = 0x55555555 },
+        { .constant = true, .value = 0xA5A5A5A5 },
+        { .constant = true, .value = 0x5A5A5A5A },
+        { .constant = false },
+        { .constant = false },
+    };
+
+    srand(c0_count());
+
+    for (int pattern = 0; pattern < sizeof(patterns) / sizeof(patterns[0]); pattern++) {
+        if (patterns[pattern].constant) {
+            display_printf("Pattern: 0x%08X ", patterns[pattern].value);
+            for (int i = 0; i < BUFFER_SIZE / sizeof(uint32_t); i++) {
+                w_buffer[i] = patterns[pattern].value;
+            }
+        } else {
+            display_printf("Pattern: random     ");
+        }
+
+        for (int offset = 0; offset < SDRAM_SIZE; offset += BUFFER_SIZE) {
+            if (!patterns[pattern].constant) {
+                for (int i = 0; i < BUFFER_SIZE / sizeof(uint32_t); i++) {
+                    *UNCACHED(&w_buffer[i]) = (rand() << 31) | rand();
+                }
+            }
+
+            pi_dma_write((io32_t *) (SDRAM_ADDRESS + offset), w_buffer, BUFFER_SIZE);
+
+            pi_dma_read((io32_t *) (SDRAM_ADDRESS + offset), r_buffer, BUFFER_SIZE);
+
+            for (int i = 0; i < BUFFER_SIZE / sizeof(uint32_t); i++) {
+                if (*UNCACHED(&w_buffer[i]) != *UNCACHED(&r_buffer[i])) {
+                    display_printf(
+                        "\nMISMATCH: [0x%08X]: 0x%08X (R) != 0x%08X (W)\n",
+                        SDRAM_ADDRESS + offset,
+                        *UNCACHED(&r_buffer[i]),
+                        *UNCACHED(&w_buffer[i])
+                    );
+                    while (true);
+                }
+            }
+
+            if ((offset % (SDRAM_SIZE / 32)) == 0) {
+                display_printf(".");
+            }
+        }
+
+        display_printf(" OK\n");
+    }
+}
+
 
 bool test_check (void) {
+    sc64_error_t error;
+    uint32_t button_state;
+
     if (OS_INFO->reset_type != OS_INFO_RESET_TYPE_COLD) {
         return false;
     }
-    return sc64_get_config(CFG_ID_BUTTON_STATE);
+
+    if ((error = sc64_get_config(CFG_ID_BUTTON_STATE, &button_state)) != SC64_OK) {
+        error_display("Command CONFIG_GET [BUTTON_STATE] failed: %d", error);
     }
 
+    return button_state != 0;
+}
+
+static struct {
+    const char *title;
+    void (*fn) (void);
+} tests[] = {
+    { "SC64 CFG", test_sc64_cfg },
+    { "RTC", test_rtc },
+    { "SD card", test_sd_card },
+    { "SDRAM", test_sdram },
+};
+
 void test_execute (void) {
+    const int test_count = sizeof(tests) / sizeof(tests[0]);
+    int current = 0;
+
+    while (true) {
         display_init(NULL);
-    display_printf("SC64 Test suite\n\n");
+        display_printf("SC64 Test suite (%d / %d)\n\n", current + 1, test_count);
 
-    display_printf("[ RTC tests ]\n");
+        display_printf("[ %s tests ]\n\n", tests[current].title);
-    test_rtc();
+        tests[current].fn();
         display_printf("\n");
 
-    display_printf("[ SD card tests ]\n");
+        current += 1;
-    test_sd_card();
+        if (current == test_count) {
-    display_printf("\n");
+            current = 0;
-
+        }
-    while (1);
+
+        display_printf("Next test [ %s ] starts in:  ", tests[current].title);
+        for (int delay = 5; delay > 0; delay--) {
+            display_printf("\b%d", delay);
+            delay_ms(1000);
+        }
+    }
 }