Index
> Main > accessing bios memoryGoto page Previous 1, 2 |
| Author |
|
|
vid 09 Aug 2010, 18:19
Alphonso wrote: That's cool. Must be awkward though with so much of the BIOS shrouded in secrecy. Not sure why there seems to be so much information that needs to be under NDA such as the BIOS writers guide and then there's probably some more that doesn't come under that either. Actually, no secrecy or NDA. Old ("legacy") BIOSes were shrouded in secrecy, UEFI has most of interfaces described in documents accessible after registration at uefi.org (unless you consider some "I accept terms" to be NDA). Quote: Haven't played with the BIOS for a while but have thought it might be cool to write some BIOS code. Nothing too extravagant, simple initializing and debug output maybe. At least I'd get a look at the CPU initial state. Shame my laptop doesn't have a serial port. Do you think this would be fairly easy? Would you have any recommendation for a suitable emulator for BIOS code? I have little experience with these stuff myself, and I think it will be fairly hard. There are too many things that need to be initialized in order to get to state where you can execute "normal" code. |
|||
09 Aug 2010, 18:19 |
|
|
shoorick 10 Aug 2010, 04:36
not bad platform to start:
http://www.youtube.com/watch?v=hgv-b-ucyZ8 http://board.flatassembler.net/topic.php?t=8189   |
|||
|
10 Aug 2010, 04:36 |
|
|
Alphonso 10 Aug 2010, 07:33
[quote="vid"]
Alphonso wrote: Actually, no secrecy or NDA.
Yeah shoorick, if I do it, it would be something like that, really basic (at least to start with). Not having a serial or parallel port is a bummer though. I wonder how much I could do without initializing RAM let alone graphics, drives, keyboard etc. Maybe I could find a GPIO I could use for communication / debug output. Then again there might be the possibility of a (mini) pci debug card and port 80h. |
|||
|
10 Aug 2010, 07:33 |
|
|
vid 10 Aug 2010, 09:58
Quote: I was thinking more along the lines of hardware. There's a heap of registers missing from the public Intel documentation. Actually, vast majority is described, but in a way that doesn't make one very smart. It would need some "theoretical introduction" (big picture how things work and cooperate), like CPU manuals have. |
|||
|
10 Aug 2010, 09:58 |
|
| Goto page Previous 1, 2 < Last Thread | Next Thread > |
Forum Rules:
|