va a estar medio loco eso pero en fin mucha suerte mi estimado para programar el bios tienes que saber programacion a nivel maquina tambien saber la organizacion de tu chip de tu BIOS, adicionando pues esta castroso que si no entiendes de conceptos de programacion de memorias EEPROM, EPROM, Flash no te metas a programa el bios por que si meteres otro tipo de fireware no compative o modificado mal ya te pelliscaste por que ni siquiera se podra prender tu maquina y tendras que ir a pedir a la empresa del bios que te reinstale el fireware de tu chip, por eso ten mucho cuidado con eso y para que te des una idea de como funciona te dejo este escrito del libro "The bios Company" autor Phil Croucher
:vientos:
WHAT HAPPENS WHEN YOU SWITCHON
The (x86) CPU is programmed to read the address space at FFFF:0000h, the last 16 bytes of memory in the first megabyte, which is just large enough to contain a jump command (JMP) that tells the processor where to find the BIOS code it is looking for (this is the bootstrap process). Next, the Power On Self Test (or POST) is run, to ensure the hardware is working (see the listings for each manufacturer to see what is actually done).
During the POST, the BIOS will look for a video BIOS between C000:000h and C780:000h, and test its checksum, after which it will allow the video BIOS to initialise itself and retake control afterwards
(you will see the manufacturer's logo and various ID strings on the screen). Then the area between
C800:000h to DF80:0000h will be searched in 2 K increments, looking for other ROMs.
The memory area at 0000:0472h contains a flag which will tell the BIOS if a cold or warm boot has occurred (a value of 1234h means it is a warm boot. Being in little endian format, where the least significant byte comes first, it will be in memory as 3412). A warm boot means that most of the POST can be skipped. Once the POST is over, the BIOS looks for an operating system in various locations. Traditionally, the order is the first floppy then the first hard drive, but you can change all that in the CMOS, to include CD ROM drives, Zip drives, etc. If the floppy drive has a bootable disk in it, the BIOS will load sector 1, head 0, cylinder 0 into memory, starting at 0000:7C00h.
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