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Merge pull request #59 from nflandin/boot-signature-corrections

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Boot Record and FSINFO Signature Corrections
This commit is contained in:
Frédéric Desbiens
2025-06-10 09:23:17 -04:00
committed by GitHub
parent 9023227ba4 151b9158ee
commit b1f509820d
1 changed files with 18 additions and 11 deletions
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common/src/fx_media_format.c
+18 -11
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@@ -443,17 +443,24 @@ UINT sectors_per_fat, f, s;
_fx_utility_memory_set(&byte_ptr[j + i], ' ', (11 - i));
#endif /* FX_DISABLE_FORCE_MEMORY_OPERATION */
/* Set bootrecord signature. */
#ifdef FX_FORCE_512_BYTE_BOOT_SECTOR
/* Set bootrecord signature. */
byte_ptr[510] = 0x55;
byte_ptr[511] = 0xAA;
/* Put the boot signature in the standard position. */
byte_ptr[FX_SIG_OFFSET] = FX_SIG_BYTE_1;
byte_ptr[FX_SIG_OFFSET + 1] = FX_SIG_BYTE_2;
#else
/* Set bootrecord signature. */
byte_ptr[bytes_per_sector - 2] = 0x55;
byte_ptr[bytes_per_sector - 1] = 0xAA;
if (bytes_per_sector < 512)
{
/* Put the boot signature at the end of the sector. */
byte_ptr[bytes_per_sector - 2] = FX_SIG_BYTE_1;
byte_ptr[bytes_per_sector - 1] = FX_SIG_BYTE_2;
}
else
{
/* Put the boot signature in the standard position. */
byte_ptr[FX_SIG_OFFSET] = FX_SIG_BYTE_1;
byte_ptr[FX_SIG_OFFSET + 1] = FX_SIG_BYTE_2;
}
#endif
/* Select the boot record write command. */
@@ -510,8 +517,8 @@ UINT sectors_per_fat, f, s;
byte_ptr[487] = 0x61;
/* Build the final signature word, this too is used to help verify that this is a FSINFO sector. */
byte_ptr[508] = 0x55;
byte_ptr[509] = 0xAA;
byte_ptr[FX_SIG_OFFSET] = FX_SIG_BYTE_1;
byte_ptr[FX_SIG_OFFSET + 1] = FX_SIG_BYTE_2;
/* Setup the total available clusters on the media. We need to subtract 1 for the FAT32 root directory. */
_fx_utility_32_unsigned_write(&byte_ptr[488], (total_clusters - 1));