getting DMA to work (non-linux bios related)

Eric W. Biederman ebiederman at
Sun Sep 22 15:35:01 CEST 2002

Ronald G Minnich <rminnich at> writes:

> On Wed, 18 Sep 2002, GNUOrder wrote:
> > Yes, it looks like a new BIOS addresses this problem.  One more question, is
> > there a way to write the new BIOS out from linux on this motherboard?  I'm
> > pretty sure its the Tyan Thunder i7500 (S2720).  It uses
> if you get a romimage the flash_rom utility can write from linux.
> Before running flash_rom you have to do this:
> setpci -d 8086:2480 4e.b=1
> to enable flash writes.
> then just flash_rom <romimage>

Be very, very careful with this.  Writing the rom is easy.
Finding and setting all of the stupid CMOS type parameters 
in the romimage is a much more difficult proposition.

Which means the board will probably still require a little bit of
keyboard and video attention once you are done.   


More information about the coreboot mailing list