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remove the code that parses the mbr. libfat already does it.

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in libfat: allow only fat32, try to parse it as fat32 even if a different partition type is specified.
This commit is contained in:
koolkdev 2021-03-26 00:37:00 +02:00 committed by Maschell
parent 7a663a151a
commit f76b9bd1d7
2 changed files with 11 additions and 61 deletions
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10
ios_fs/source/fat/fat_access.c
View File

@ -95,6 +95,8 @@ int fatfs_init(struct fatfs *fs)
break;
case 0x00:
valid_partition = 0;
if (GET_16BIT_WORD(fs->currentsector.sector, 0x0B) != FAT_SECTOR_SIZE)
return FAT_INIT_WRONG_PARTITION_TYPE;
break;
default:
if (fs->currentsector.sector[PARTITION1_TYPECODE_LOCATION] <= 0x06)
@ -103,7 +105,8 @@ int fatfs_init(struct fatfs *fs)
}
// Read LBA Begin for the file system
if (valid_partition)
// Try to parse as FAT32 even if a non valid partition is specified
if (valid_partition || GET_16BIT_WORD(fs->currentsector.sector, 0x0B) != FAT_SECTOR_SIZE)
fs->lba_begin = GET_32BIT_WORD(fs->currentsector.sector, PARTITION1_LBA_BEGIN_LOCATION);
// Else possibly MBR less disk
else
@ -176,8 +179,9 @@ int fatfs_init(struct fatfs *fs)
fs->rootdir_first_cluster = 0;
// Volume is FAT16
fs->fat_type = FAT_TYPE_16;
return FAT_INIT_OK;
return FAT_INIT_WRONG_FILESYS_TYPE;
//fs->fat_type = FAT_TYPE_16;
//return FAT_INIT_OK;
}
else
{

62
ios_fs/source/sd_fat.c
View File

@ -7,39 +7,12 @@
#include "sd_fat.h"
unsigned char sd_io_buffer[0x40000] __attribute__((aligned(0x40))) __attribute__((section(".io_buffer")));
unsigned int fat_sector = 0;
#define PARTITION_TYPE_FAT32 0x0c
#define PARTITION_TYPE_FAT32_CHS 0x0b
#define MBR_SIGNATURE 0x55AA
#define EBR_SIGNATURE MBR_SIGNATURE
#define PARTITION_BOOTABLE 0x80 /* Bootable (active) */
#define PARTITION_NONBOOTABLE 0x00 /* Non-bootable */
#define PARTITION_TYPE_GPT 0xEE /* Indicates that a GPT header is available */
typedef struct _PARTITION_RECORD {
u8 status; /* Partition status; see above */
u8 chs_start[3]; /* Cylinder-head-sector address to first block of partition */
u8 type; /* Partition type; see above */
u8 chs_end[3]; /* Cylinder-head-sector address to last block of partition */
u32 lba_start; /* Local block address to first sector of partition */
u32 block_count; /* Number of blocks in partition */
} __attribute__((__packed__)) PARTITION_RECORD;
typedef struct _MASTER_BOOT_RECORD {
u8 code_area[446]; /* Code area; normally empty */
PARTITION_RECORD partitions[4]; /* 4 primary partitions */
u16 signature; /* MBR signature; 0xAA55 */
} __attribute__((__packed__)) MASTER_BOOT_RECORD;
int sd_fat_read(unsigned long sector, unsigned char *buffer, unsigned long sector_count)
{
// It seems that sdcard_readwrite overwrite more bytes than requested with 0xff.... So I use io_buffer to read it.
if (sector_count * SDIO_BYTES_PER_SECTOR > sizeof(sd_io_buffer)) return 0;
int result = sdcard_readwrite(SDIO_READ, sd_io_buffer, sector_count, SDIO_BYTES_PER_SECTOR, fat_sector + sector, NULL, DEVICE_ID_SDCARD_PATCHED);
int result = sdcard_readwrite(SDIO_READ, sd_io_buffer, sector_count, SDIO_BYTES_PER_SECTOR, sector, NULL, DEVICE_ID_SDCARD_PATCHED);
if (result) return 0;
memcpy(buffer, sd_io_buffer, sector_count * SDIO_BYTES_PER_SECTOR);
return 1;
@ -48,45 +21,18 @@ int sd_fat_read(unsigned long sector, unsigned char *buffer, unsigned long secto
int sd_fat_write(unsigned long sector, unsigned char *buffer, unsigned long sector_count)
{
if (sector_count * SDIO_BYTES_PER_SECTOR > sizeof(sd_io_buffer)) return 0;
int result = sdcard_readwrite(SDIO_WRITE, buffer, sector_count, SDIO_BYTES_PER_SECTOR, fat_sector + sector, NULL, DEVICE_ID_SDCARD_PATCHED);
int result = sdcard_readwrite(SDIO_WRITE, buffer, sector_count, SDIO_BYTES_PER_SECTOR, sector, NULL, DEVICE_ID_SDCARD_PATCHED);
return result ? 0 : 1;
}
int InitSDCardFAT32()
{
MASTER_BOOT_RECORD *mbr = (MASTER_BOOT_RECORD*)sd_io_buffer;
memset(mbr, 0, SDIO_BYTES_PER_SECTOR);
int result = sdcard_readwrite(SDIO_READ, mbr, 1, SDIO_BYTES_PER_SECTOR, 0, NULL, DEVICE_ID_SDCARD_PATCHED);
if(result != 0)
{
_printf(20, 40, "SD card read failed %i", result);
return result;
}
if (mbr->signature != MBR_SIGNATURE) {
_printf(20, 40, "SD not MBR");
return -1;
}
if (mbr->partitions[0].status != PARTITION_BOOTABLE && mbr->partitions[0].status != PARTITION_NONBOOTABLE) {
_printf(20, 40, "Invalid paritition status");
return -1;
}
if (mbr->partitions[0].type != PARTITION_TYPE_FAT32 && mbr->partitions[0].type != PARTITION_TYPE_FAT32_CHS) {
_printf(20, 40, "First paritition not FAT32");
return -1;
}
fat_sector = le32(mbr->partitions[0].lba_start);
fl_init();
result = fl_attach_media(sd_fat_read, sd_fat_write);
int result = fl_attach_media(sd_fat_read, sd_fat_write);
if (result != FAT_INIT_OK)
{
_printf(20, 40, "FAT32 attach failed %i", result);
_printf(20, 40, "FAT32 attach failed %d", result);
return result;
}