Help needed in writing small BIOS or monitor program

[amitjagtap]

Help me in BIOS writing

Hi all,
I m palnning to write small BIOS or monitor program for my Embedded Board.
Can anybody tell me, how to proceed for this. What all includes in writing such program. Is it assembly coding only or Assembly + C or something else....
Experts are requested to write post, please.
Thanking you.

 

[GetDeviceInfo]

Re: Help me in BIOS writing

I'm not an expert.

Assembler is used for the large part, because of direct register manipulation, which keeps the code compact.

you'll need a general call which deciphers the request, does any housekeeping then transfers the request to more specific routines.

Establish guidelines to apply to all requests, ie; immediate data in specific registers, memory blocks specifically assigned, etc.

Determine what registers, memory blocks are altered by the routines, and what and where thier responses will be returned.

Determine what housekeeping is required prior to returning from calls.