On 16.10.2008 23:54, ron minnich wrote: > On Thu, Oct 16, 2008 at 2:52 PM, Carl-Daniel Hailfinger > <[EMAIL PROTECTED]> wrote: > > >> If that's it, the solution is absolutely simple. And I mean totally simple. >> 1. Backup old content >> 2. Write ffffffff >> > > at this point it is game over. > The code that does this is in rom. >
Hm. Unshare only this function, maybe with another name? >> 3. Read back and save in a variable >> 4. Restore old content. >> Make sure no code blacked out by the decode is executed between 1 and 4 >> and you're safe. If you're feeling paranoid, do it as inline asm. Make >> sure that short sequence is never ever run as XIP code in ROM (I can do >> that checking right now). >> >> What am I missing? >> >> > > the big thing is that the problem code is a binary vga bios over which > we have zero control. :-( > Hmmm. Is it running in vm86? If yes, we can trap I/O port writes and reads, so this is solvable. Same should apply to x86emu. Regards, Carl-Daniel -- http://www.hailfinger.org/ -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
