Ok, It seems that I'v got it. In file arch/x86/boot/tools/build.c, fill the setup_sects parameters in header.S with "setup_sectors-1". Why build tool do this, It very strange!
Regards, Baisheng "buf[0x1f1] = setup_sectors-1;" 2011/2/11 Vladimir 'φ-coder/phcoder' Serbinenko <[email protected]> > On 02/10/2011 03:52 PM, Baisheng Wang wrote: > > > > Let me clarify again. > > > > In grub-1.98/loader/i386/linux.c, for the code lines： > > > > "grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE);" > > > > and > > > > "prot_size = grub_file_size (file) - real_size - GRUB_DISK_SECTOR_SIZE;" > > > > I want to know why there is another sector, I mean GRUB_DISK_SECTOR_SIZE > ? > > > Trivial, Watson. first sector contains the part which is launched only > when dd'ing to floppy, not with a propoer bootloader. Actually recent > kernels just contain a stub instruction to use a bootloader > > Thanks, > > Baisheng > > > > > > 2011/2/10 Baisheng Wang <baisheng.wang.cn > > <http://baisheng.wang.cn>@gmail.com <http://gmail.com>> > > > > Dear all: > > > > In the file grub-1.98/loader/i386/linux.c, for the variable > > prot_size, why subtract GRUB_DISK_SECTOR_SIZE ? > > > > Thanks & Regards, > > Baisheng > > > > > > > > _______________________________________________ > > Grub-devel mailing list > > [email protected] > > http://lists.gnu.org/mailman/listinfo/grub-devel > > > > > -- > Regards > Vladimir 'φ-coder/phcoder' Serbinenko > > > > _______________________________________________ > Grub-devel mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/grub-devel > >
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