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Re: How to debug 'out of disk' error.
From: |
Vladimir 'φ-coder/phcoder' Serbinenko |
Subject: |
Re: How to debug 'out of disk' error. |
Date: |
Thu, 17 Mar 2011 17:29:51 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20110303 Icedove/3.0.11 |
On 17.03.2011 17:09, Lennart Sorensen wrote:
> On Wed, Mar 16, 2011 at 11:16:05PM +0100, Vladimir 'φ-coder/phcoder'
> Serbinenko wrote:
>
>> It's not really a fixup. Correct return on no error is CF=0 AH=0. Some
>> BIOSes in some other functions returned CF=0, AH!= 0 on no error so it
>> was a wild guess.
>>
>>> Failed int13_ext call: ah=42, drive=80, dap= 6fe00 returned eax=8000
>>>
>>>
>> Error 0x80 according to
>> http://www.delorie.com/djgpp/doc/rbinter/it/34/2.html means timeout.
>> Following code would retry on timeout:
>> === 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 22:13:12 +0000
>> @@ -72,6 +72,8 @@
>> grub_biosdisk_rw_int13_extensions (int ah, int drive, void *dap)
>> {
>> struct grub_bios_int_registers regs;
>> + int tries = 4;
>> + retry:
>> regs.eax = ah << 8;
>> /* compute the address of disk_address_packet */
>> regs.ds = (((grub_addr_t) dap) & 0xffff0000) >> 4;
>> @@ -80,6 +82,16 @@
>> regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
>>
>> grub_bios_interrupt (0x13, ®s);
>> + if (!(regs.flags & GRUB_CPU_INT_FLAGS_CARRY))
>> + return 0;
>> +
>> + if (((regs.eax >> 8) & 0xff) == 0x80 && tries)
>> + {
>> + grub_millisleep (10);
>> + tries--;
>> + goto retry;
>> + }
>> +
>> return (regs.eax >> 8) & 0xff;
>> }
>>
> So that didn't make any difference to it.
>
> It just keeps returning 0x8000 in eax on every retry.
>
>
Another wild guess:
@@ -506,6 +520,8 @@ get_safe_sectors (grub_disk_addr_t secto
grub_size_t size;
grub_uint32_t offset;
+ return 1;
+
/* OFFSET = SECTOR % SECTORS */
grub_divmod64 (sector, sectors, &offset);
> I really want to find out what this BIOS is doing wrong so I can tell
> the system maker what to fix.
>
> I am going to add some debuging to find out what is in the dap being
> passed to the BIOS.
>
>
--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko
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- Re: How to debug 'out of disk' error., (continued)
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/16
- Re: How to debug 'out of disk' error., Phillip Susi, 2011/03/16
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/16
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/16
- Re: How to debug 'out of disk' error., Vladimir 'φ-coder/phcoder' Serbinenko, 2011/03/16
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/16
- Re: How to debug 'out of disk' error., Vladimir 'φ-coder/phcoder' Serbinenko, 2011/03/16
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/17
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/17
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/17
- Re: How to debug 'out of disk' error.,
Vladimir 'φ-coder/phcoder' Serbinenko <=
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/17
- Re: How to debug 'out of disk' error., Vladimir 'φ-coder/phcoder' Serbinenko, 2011/03/17
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/17
- Re: How to debug 'out of disk' error., Grégoire Sutre, 2011/03/18
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/18
- Re: How to debug 'out of disk' error., Grégoire Sutre, 2011/03/18
- Re: How to debug 'out of disk' error., Lennart Sorensen, 2011/03/18
- Re: How to debug 'out of disk' error., Vladimir 'φ-coder/phcoder' Serbinenko, 2011/03/16