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fatfs: extend gpt support

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This commit is contained in:
Christoph Baumann
2025-04-20 19:52:15 +02:00
parent 3250b2e32a
commit 9d2ec42a9f
1 changed files with 23 additions and 6 deletions
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29
bdk/libs/fatfs/ff.c
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@@ -473,6 +473,10 @@ static const char* const VolumeStr[FF_VOLUMES] = {FF_VOLUME_STRS}; /* Pre-define
#endif
#endif
#if FF_SIMPLE_GPT
static const BYTE GUID_MS_Basic[16] = {0xA2,0xA0,0xD0,0xEB,0xE5,0xB9,0x33,0x44,0x87,0xC0,0x68,0xB6,0xB7,0x26,0x99,0xC7};
#endif
/*--------------------------------*/
/* LFN/Directory working buffer */
@@ -3319,15 +3323,28 @@ static FRESULT find_volume ( /* FR_OK(0): successful, !=0: an error occurred */
}
#if FF_SIMPLE_GPT
if (fmt >= 2) {
/* If GPT Check the first partition */
/* If GPT, iterate over all part entries and check MS Basic partitions */
gpt_header_t *gpt_header = (gpt_header_t *)fs->win;
if (move_window(fs, 1) != FR_OK) return FR_DISK_ERR;
if (!mem_cmp(&gpt_header->signature, "EFI PART", 8)) {
if (move_window(fs, gpt_header->part_ent_lba) != FR_OK) return FR_DISK_ERR;
gpt_entry_t *gpt_entry = (gpt_entry_t *)fs->win;
fs->part_type = 1;
bsect = gpt_entry->lba_start;
fmt = bsect ? check_fs(fs, bsect) : 3; /* Check the partition */
DWORD cur_entry, ofs, part;
part = LD2PT(vol);
cur_entry = 0;
for(i = 0; i < gpt_header->num_part_ents; i++){
if (move_window(fs, gpt_header->part_ent_lba + i * sizeof(gpt_entry_t) / SS(fs))) return FR_DISK_ERR;
ofs = i * sizeof(gpt_entry_t) % SS(fs);
gpt_entry_t *gpt_entry = (gpt_entry_t *)fs->win + ofs;
if (!mem_cmp(gpt_entry->type_guid, GUID_MS_Basic, 16)){
cur_entry++;
bsect = gpt_entry->lba_start;
fmt = bsect ? check_fs(fs, bsect) : 3;
if(part == 0 && fmt <= 1) break;
if(part != 0 && cur_entry == part) break;
}
}
if(part && part != cur_entry){
fmt = 3;
}
}
}
#endif