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

Kevin O'Connor kevin at koconnor.net
Sun Jan 24 19:18:33 CET 2010

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);
+                }

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


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