On Wed, Apr 05, 2006 at 02:17:57PM -0700, Luck, Tony wrote:
> On Wed, Apr 05, 2006 at 10:15:34AM -0600, Bjorn Helgaas wrote:
> > Huh. Intel firmware used to just not mention the VGA framebuffer
> > (0xa0000-0xc0000) at all in the EFI memory map. I think that was
> > clearly a bug. So maybe they fixed that by marking it WB (and
> > hopefully UC as well).
>
> Nope ... not fixed (at least not in the f/w that I'm running). The
> VGA buffer is still simply not mentioned in the EFI memory map.
>
> The problem looks to come from this code in vgacon.c:
>
> vga_vram_base = VGA_MAP_MEM(vga_vram_base);
> vga_vram_end = VGA_MAP_MEM(vga_vram_end);
> vga_vram_size = vga_vram_end - vga_vram_base;
Wouldn't it be better to do:
vga_vram_size = vga_vram_end - vga_vram_base;
vga_vram_base = VGA_IOREMAP(vga_vram_base, vga_vram_size);
vga_vram_end = vga_vram_base + vga_vram_size;
and for compatibility:
#define VGA_IOREMAP(base,size) VGA_MAP_MEM(base)
?
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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