[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Why prot_size subtract GRUB_DISK_SECTOR_SIZE in the file grub-1.98/l
From: |
Vladimir 'φ-coder/phcoder' Serbinenko |
Subject: |
Re: Why prot_size subtract GRUB_DISK_SECTOR_SIZE in the file grub-1.98/loader/i386/linux.c ? |
Date: |
Fri, 11 Feb 2011 00:34:04 +0300 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20101226 Icedove/3.0.11 |
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
> address@hidden
> http://lists.gnu.org/mailman/listinfo/grub-devel
>
--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko
signature.asc
Description: OpenPGP digital signature