Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line

[Laurent Vivier]

Le 18 déc. 08 à 18:41, Gleb Natapov a écrit :

> On Thu, Dec 18, 2008 at 11:23:16AM -0600, Anthony Liguori wrote:
> > > I'm open for the firmware config if you explain to me how state
> > > information is supposed to be transfered from rombios32.c (where the
> > > fw_cfg is evaluated) to some function in rombios.c. Tried this but  
> > > found
> > > nothing obvious.
> >
> > Gleb, could you comment here?  I'm obviously ignorant of the firmware
> > config code in the BIOS.  It seems like the right thing to use but if
> > it's all the current support is in 32-bit code, it may be difficult  
> > to
> > use that within the 16-bit code without rewriting it all.
> Firmware config is accessed by inb/outw IO instructions so it should  
> be
> easy to do that from rombios.c. But it is possible to read the option
> in rombios32.c and put it somewhere in unused space in 0x400 and check
> the value from rombios.c.


Look at my patches to add splash screen: they use firmware  
configuration device from rombios.c.

Regards,
Laurent
----------------------- Laurent Vivier ----------------------
"The best way to predict the future is to invent it."
- Alan Kay