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Boot Record and FSINFO Signature Corrections #59

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Boot Record and FSINFO Signature Corrections #59

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ee280d9
Update fx_media_format.c
nflandin Jun 21, 2024
151b915
re: issue 47 by coran21
nflandin Sep 3, 2024
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29 changes: 18 additions & 11 deletions common/src/fx_media_format.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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. */
Expand Down Expand Up @@ -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));
Expand Down