On 16.03.2011 17:58, Lennart Sorensen wrote:
> On Wed, Mar 16, 2011 at 04:29:32PM +0100, Vladimir 'φ-coder/phcoder'
> Serbinenko wrote:
>
>> On 16.03.2011 16:13, Lennart Sorensen wrote:
>>
>>> I am trying to figure out why grub2 (from Debian Squeeze) gives an 'out
>>> of disk' error when trying to boot from the HD after doing an install.
>>> It ends up at a grub rescue prompt, given it can't even read the disk
>>> well enough to load the full grub. Doing ls shows the disks, and I can
>>> show the root directory of a partition, but anything further seems to
>>> hit the same 'out of disk' error.
>>>
>>>
>>>
>> ls -l should show how big it thinks the disk is. Compare it with its
>> real size
>>
>>> The system is a Compulab CM-iTC which uses an intel tunnelcreek atom
>>> (the new one) with a phoenix bios. So far Compulab's response when told
>>> it won't boot grub2 was "We know, but syslinux works fine.", which to
>>> me is not a solution at all. The same system also hangs the Linux 2.6.32
>>> kernel unless 'edd=off' is added to the kernel command line.
>>>
>>>
>>>
>> Looks like int13 is borked. Perhaps it's borked in a way which prevents
>> GRUB from detecting 13/42 function. You can try to force int13/42 by:
>> === modified file 'grub-core/disk/i386/pc/biosdisk.c'
>> --- grub-core/disk/i386/pc/biosdisk.c 2011-01-04 14:42:47 +0000
>> +++ grub-core/disk/i386/pc/biosdisk.c 2011-03-16 15:28:26 +0000
>> @@ -145,6 +145,8 @@
>> {
>> struct grub_bios_int_registers regs;
>>
>> + return 1;
>> +
>> regs.edx = drive & 0xff;
>> regs.eax = 0x4100;
>> regs.ebx = 0x55aa;
>>
> OK, the code in 1.98(plus some git stuff) that is in debian uses assembly
> code for that part. I changed the place calling it instead and added
> some debug info.
>
> When running from linux, the diskinfo bios call returns a total_sectors of
> 4352 sectors, for an 80G drive. That's just messed up. I haven't tried
> booting it yet to see if it returns the same value then, but I suspect
> it will.
>
>
Following change would make GRUB ignore the total_sectors (as an
investigation measure):
@@ -398,7 +400,7 @@
total_sectors = data->cylinders * data->heads * data->sectors;
}
- disk->total_sectors = total_sectors;
+ disk->total_sectors = GRUB_DISK_SIZE_UNKNOWN;
disk->data = data;
return GRUB_ERR_NONE;-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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