Original.tmp Decompression Routine for The "Extension_BIOS Components"Ī more detailed tutorial on BIOS Reverse engineering is in my book. Call to the POST routine a.k.a "POST jump table execution" The awardext.rom and Extension BIOS Components (lower 128KB bios-code) Relocation Routine Enable the microprocessor cache then jump into the decompressed system BIOS The key parts of the decompression routine The format of the LZH level-1 compressed bios components Decompress the compressed BIOS components Verify checksum of the whole compressed BIOS image Copy lower 128KB of BIOS code from ROM chip into RAM Call to bios decompression routine and the jump into decompressed system bios The Memory Map In The Real System (Mainboard) Click here to download the off-line version of this article.
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