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atad: report PS2 area size as LBA48 disk capacity for LBA48-aware DVRP firmware #920

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Merged
uyjulian merged 1 commit into from
Sep 3, 2026
Merged

atad: report PS2 area size as LBA48 disk capacity for LBA48-aware DVRP firmware #920

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24 changes: 13 additions & 11 deletions iop/dev9/atad/src/ps2atad.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1291,16 +1291,6 @@ static int ata_init_devices(ata_devinfo_t *devinfo)
either words(61:60) for 28-bit or words(103:100) for 48-bit. */
devinfo[i].lba48 = (ata_param[ATA_ID_COMMAND_SETS_SUPPORTED] & 0x0400) != 0;

/* Check for "PS2LBA48" magic in reserved words 121-124 */
if (ata_dvrp_workaround &&
ata_param[121] == 0x4456 &&
ata_param[122] == 0x524c &&
ata_param[123] == 0x4241 &&
ata_param[124] == 0x3438) {
M_PRINTF("LBA48-capable DVRP firmware detected, disabling the workaround\n");
ata_dvrp_workaround = 0;
}

/* Save the total sector counts before we overwrite ata_param with the value of Sony identify drive command. */
total_sectors_nonlba48 = (ata_param[ATA_ID_SECTOTAL_HI] << 16) | ata_param[ATA_ID_SECTOTAL_LO];
if (ata_param[ATA_ID_48BIT_SECTOTAL_HI]) {
Expand Down Expand Up @@ -1341,10 +1331,22 @@ static int ata_init_devices(ata_devinfo_t *devinfo)
/* If this device is emulated through the DVRP, use the non-48-bit LBA size. */
if (ata_dvrp_workaround) {
devinfo[i].total_sectors = total_sectors_nonlba48;
/* Check for "PS2LBA48" magic in reserved words 121-124 */
/* PS2 area size is still stored in the 28-bit LBA size */
if (ata_param[121] == 0x4456 &&
ata_param[122] == 0x524c &&
ata_param[123] == 0x4241 &&
ata_param[124] == 0x3438) {
M_PRINTF("LBA48-capable DVRP firmware detected, disabling the workaround\n");
ata_dvrp_workaround = 0;
devinfo[i].total_sectors_lba48 = total_sectors_nonlba48;
} else {
devinfo[i].total_sectors_lba48 = total_sectors_lba48;
}
} else {
devinfo[i].total_sectors = total_sectors_lba48;
devinfo[i].total_sectors_lba48 = total_sectors_lba48;
}
devinfo[i].total_sectors_lba48 = total_sectors_lba48;
} else {
devinfo[i].total_sectors = total_sectors_nonlba48;
devinfo[i].total_sectors_lba48 = total_sectors_nonlba48;
Expand Down
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