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Understand bios tables
#1
Hi modders,

I have some experience in disassembling/decompiling (through challenges) and I am now curious about how bios work.
The subject seems to be quite hard but I really would like to improve myself.

I am currently trying to remove a wwlan whitelist limitation on a laptop with a phoenix bios.

First of all I have dump the tables with andyp's phoenix tool. Was it the first step to do ?
Secondly, I now have multiple tables :

ACPI00.AML
ACPI01.BIN
ACPI02.BIN
ACPI03.ROM
BB.BIN
BIOSCOD00.ROM
BIOSCOD01.ROM
BIOSCOD02.ROM
BIOSCOD03.ROM
BIOSCOD04.ROM
BIOSCOD05.ROM
BIOSCOD06.ROM
BIOSCOD07.ROM
_C00.PEI
DECOMPC00.PEI
DISPLAY00.ROM
ESCD.BIN
Gap0
Gap1
Gap2
Gap3
Gap4
Gap5
Gap6
HOLE0.ROM
HOLE10.ROM
HOLE11.ROM
HOLE12.ROM
HOLE13.ROM
HOLE1.ROM
HOLE2.ROM
HOLE3.ROM
HOLE4.ROM
HOLE5.ROM
HOLE6.ROM
HOLE7.ROM
HOLE8.ROM
HOLE9.ROM
LOGO00.BIN
LOGO01.BIN
MISER00.ROM
MOD_4800.ROM
MOD_4A01.ROM
MOD_4B00.ROM
MOD_4B01.ROM
MOD_5100.ROM
MOD_5900.ROM
OPROM00.ROM
OPROM01.ROM
OPROM02.ROM
ROMEXEC00.ROM
ROMEXEC01.ROM
SETUP00.ROM
STRINGS00.ROM
TEMPLAT00.ROM
volumedir.bin2
volumeinfo.bin
volumeinfo.bin_1
volumeinfo.bin_2
volumeinfo.bin_3
volumeinfo.bin_4
volumeinfo.bin_5


What is the basic meaning for each of these ?
It looks like bios is made of multiple small executables. If I want to edit something (eg wwan whitelist), how can I find out the appropriate file to change ?
Is there a tool that can disassemble these exe like radare2 or gdb ?

Thank you very much for your answers, a starting point would be really appreciated Smile
find
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