mirror of
https://github.com/Polprzewodnikowy/SummerCart64.git
synced 2025-01-15 05:59:10 +01:00
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
#include "boot/boot.h"
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typedef struct sc64_cart_registers {
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__IO reg_t SCR;
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__IO reg_t COMMAND;
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__IO reg_t ARG[2];
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__IO reg_t RESPONSE;
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__IO reg_t BOOTSTRAP;
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} sc64_cfg_registers_t;
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#define SC64_CFG_BASE (0x1FFF0000)
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#define SC64_CFG ((__IO sc64_cfg_registers_t *) SC64_CFG_BASE)
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#define SC64_CFG_SCR_CPU_BOOTSTRAPPED (1 << 31)
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#define SC64_CFG_SCR_CPU_BUSY (1 << 30)
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#define CMD_SDRAM_SWITCH 'S'
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#define CMD_DEBUG 'D'
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void print_debug(uint32_t a1, uint32_t a2) {
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uint32_t scr = 0;
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do {
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scr = platform_pi_io_read(&SC64_CFG->SCR);
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} while (scr & SC64_CFG_SCR_CPU_BUSY);
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platform_pi_io_write(&SC64_CFG->ARG[0], a1);
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platform_pi_io_write(&SC64_CFG->ARG[1], a2);
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platform_pi_io_write(&SC64_CFG->COMMAND, (uint32_t) CMD_DEBUG);
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}
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int main(void) {
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OS_BOOT_CONFIG->tv_type = TV_NTSC;
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uint32_t scr = 0;
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do {
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scr = platform_pi_io_read(&SC64_CFG->SCR);
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} while (!(scr & SC64_CFG_SCR_CPU_BOOTSTRAPPED));
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do {
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scr = platform_pi_io_read(&SC64_CFG->SCR);
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} while (scr & SC64_CFG_SCR_CPU_BUSY);
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platform_pi_io_write(&SC64_CFG->ARG[0], 1);
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platform_pi_io_write(&SC64_CFG->COMMAND, (uint32_t) CMD_SDRAM_SWITCH);
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do {
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scr = platform_pi_io_read(&SC64_CFG->SCR);
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} while (scr & SC64_CFG_SCR_CPU_BUSY);
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cart_header_t *cart_header = boot_load_cart_header();
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uint16_t cic_seed = boot_get_cic_seed(cart_header);
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tv_type_t tv_type = boot_get_tv_type(cart_header);
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print_debug(cic_seed << 16 | (tv_type & 0x03), cart_header->pi_conf);
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boot(cart_header, cic_seed, tv_type);
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}
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