Hello,
I want to boot ReactOs-LiveCD using an iso with grub2. Knowing that the
boot sector is located at the offset 0xA800 (43008. ), and is 2048 bytes
length.
I do it this way:
grub> loopback loop (hd0,1)/ReactOS-LiveCD.iso
grub> chainloader 84+4 //43008 / 512 = 84
error : invalid signature
The problem is that my iso has 2048 sector size, whereas grub uses only
512 bytes. Trying to use --force doesn't work, since only 512 bytes are
loaded ...
And in fact if I skip the three 512 bytes of my boot sector (so 84+3) :
grub> chainloader 87+1
grub> //no error, but indeed will crash when
using boot
chainloader passes successfully, as grub locates 0x55 and 0xAA at the end.
I searched in the source code and I found:
if (grub_file_read (file, (void *) 0x7C00, GRUB_DISK_SECTOR_SIZE) !=
GRUB_DISK_SECTOR_SIZE)
Where GRUB_DISK_SECTOR_SIZE is defined as:
#define GRUB_DISK_SECTOR_SIZE 0x200 //512
So it's clear that there is no way to load more than 512 bytes.
Could you please add a way to change the default sector size? Or maybe
only add a parameter to chainloader for a custom sector size?
Thank you in advance.
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