On 08/04/2010 04:13 PM, User wrote: > 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 see no reason to support such obscure interface considering that freeldr.sys can be loaded with multiboot command. > > 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. > > _______________________________________________ > Bug-grub mailing list > Bug-grub@gnu.org > http://lists.gnu.org/mailman/listinfo/bug-grub >
-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
signature.asc
Description: OpenPGP digital signature
_______________________________________________ Bug-grub mailing list Bug-grub@gnu.org http://lists.gnu.org/mailman/listinfo/bug-grub
