On Mon, Dec 31, 2007 at 04:40:00PM +0100, Christian Franke wrote:
> This version of the patch contains only the fix for the E801 EISA memory
> map. The memory existence check was helpful for testing but is not
> really necessary.
I think the memory existence check might be good to have (I'd make sure it's
not cpu-specific and move it to kern/whatever.c, though). As for the rest..
> But this bug should be fixed, otherwise GRUB2 would crash if BIOS does
> not provide the E820 memory map.
>
> Christian
>
>
> 2007-12-31 Christian Franke <[EMAIL PROTECTED]>
>
> * kern/i386/pc/init.c (grub_machine_init): Fix
> evaluation of eisa_mmap.
I don't think I'm the most indicate to review this part of the patch, but
since nobody else does...
Well you might find this funny, but try a google search for "e801 eisa" and
see what the first hit is. :-)
> --- grub2.orig/kern/i386/pc/init.c 2007-10-22 22:22:51.359375000 +0200
> +++ grub2/kern/i386/pc/init.c 2007-12-31 16:05:59.953125000 +0100
> @@ -199,13 +199,8 @@ grub_machine_init (void)
>
> if (eisa_mmap)
> {
> - if ((eisa_mmap & 0xFFFF) == 0x3C00)
> - add_mem_region (0x100000, (eisa_mmap << 16) + 0x100000 * 15);
> - else
> - {
> - add_mem_region (0x100000, (eisa_mmap & 0xFFFF) << 10);
> - add_mem_region (0x1000000, eisa_mmap << 16);
> - }
> + add_mem_region (0x100000, (eisa_mmap & 0xFFFF) << 10);
> + add_mem_region (0x1000000, eisa_mmap & ~0xFFFF);
> }
> else
> add_mem_region (0x100000, grub_get_memsize (1) << 10);
Ok, as it seems, this comes from:
* grub_get_eisa_mmap() : return packed EISA memory map, lower 16 bits is
* memory between 1M and 16M in 1K parts, upper 16 bits is
* memory above 16M in 64K parts. If error, return zero.
So the replacement of "eisa_mmap << 16" seems obviously correct, but the
"0x3C00" part you removed is completely misterious to me. Can you explain
what was it supposed to be doing or why you removed it?
--
Robert Millan
<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)
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