On Mon, Sep 1, 2008 at 6:48 PM, Viswesh S <[EMAIL PROTECTED]> wrote:
>
>
> ----- Original Message ----
> From: Bean <[EMAIL PROTECTED]>
> To: The development of GRUB 2 <[email protected]>
> Sent: Monday, 1 September, 2008 3:46:32 PM
> Subject: Re: Windows,grub and grub2
>
> On Mon, Sep 1, 2008 at 5:08 PM, Viswesh S <[EMAIL PROTECTED]> wrote:
>>
>>
>
> Hi,
>
> Do you mean the result is still the same after you apply my patch ? I
> check the source code of grub legacy, the handling should be exactly
> the same. Are you using the official branch grub 0.96, or some package
> with modification ?
>
> You can also check memory at 0x7be, this should be the partition table
> in mbr, %esi would point to the boot partition.
>
> --
> Bean
>
> Hi,
>
> The result is still the same after the patch.
>
> I am using the official grub2 released package 1.96.
>
> In that the chainloader patch wasnt there.Hence applied that according to
> your inputs as in the mail.
>
> I checked the memory at 0x7be, which is the same as 0x1be in the mbr.
>
> The first partition was already active also.
>
> Also as I mentioned,what about the code for the int 13 extension and and
> their functionalities for 2,41,42.
>
> Is there any change there.
>
> Otherwise I am not really sure, why grub is able to boot,but grub2 not.
Hi,
I doubt that this is caused by int 13, as grub2 doesn't change it.
Besides, the boot sector is read properly in grub2, so int 13 should
be working.
I have thought of another possible reason for this. In grub2, %dh is
0, perhaps it should be set to the partition number. Please test if
the new patch works.
--
Bean
diff --git a/loader/i386/pc/chainloader.c b/loader/i386/pc/chainloader.c
index 825dbb3..5dcc08a 100644
--- a/loader/i386/pc/chainloader.c
+++ b/loader/i386/pc/chainloader.c
@@ -101,12 +101,25 @@ grub_chainloader_cmd (const char *filename, grub_chainloader_flags_t flags)
/* In i386-pc, the id is equal to the BIOS drive number. */
drive = (int) disk->id;
- if (p)
+ if ((p) && (p->index < 4))
{
- grub_disk_read (disk, p->offset, 446, 64,
- (char *) GRUB_MEMORY_MACHINE_PART_TABLE_ADDR);
+ int i;
+
+ disk->dev->read (disk, 0, 1,
+ (char *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
+
+ grub_memcpy ((char *) GRUB_MEMORY_MACHINE_PART_TABLE_ADDR,
+ (char *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 0x1be,
+ 64);
+
part_addr = (void *) (GRUB_MEMORY_MACHINE_PART_TABLE_ADDR
+ (p->index << 4));
+
+ for (i = 0; i < 4; i++)
+ *((char *) GRUB_MEMORY_MACHINE_PART_TABLE_ADDR + i * 16) = 0;
+
+ *((unsigned char *) part_addr) = 0x80;
+ drive |= (p->index << 8);
}
}
@@ -119,6 +132,8 @@ grub_chainloader_cmd (const char *filename, grub_chainloader_flags_t flags)
boot_drive = drive;
boot_part_addr = part_addr;
+ grub_printf ("edx = %x, %esi = %p\n", drive, part_addr);
+
grub_loader_set (grub_chainloader_boot, grub_chainloader_unload, 1);
return;
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