[SeaBIOS] [PATCH] mark VBE mapping as reserved in e820

Avi Kivity avi at redhat.com
Mon Jan 25 16:06:18 CET 2010

On 01/24/2010 08:18 PM, Kevin O'Connor wrote:
> On Sun, Jan 24, 2010 at 12:16:11PM +0200, Avi Kivity wrote:
>> That's not correct - when running with PCI -vga std _is_ a PCI
>> device (and it has a BAR).  What's needed is to make the VBE BIOS
>> aware of it.
> According to Sebastian, the latest version of vgabios (v0.6c) does
> support this.  I see that the following was added to vbe.c:
> +                lfb_addr = pci_get_lfb_addr(0x1234); // experimental vendor
> +                if (lfb_addr>  0) {
> +                  info.PhysBasePtr = ((Bit32u)lfb_addr<<  16);
> +                }

It's clear we should pull this for qemu.git master.  But what about 
0.12?  I prefer going back to 0xf0* to reduce the risk for further 

> The vgabios code could use an overhaul - it has many of the same
> maintenance problems that bochs bios has.  A port to gcc would be a
> big help.  Some time back, I ported the base vga code (see the vgasrc/
> directory in seabios git), but I haven't looked at the cirrus or vbe
> extensions.

That would be great, even though vgabios doesn't see much churn.

error compiling committee.c: too many arguments to function

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