Re: Why prot_size subtract GRUB_DISK_SECTOR_SIZE in the file grub-1.98/loader/i386/linux.c ?

[Baisheng Wang]

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 <address@hidden>

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
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>


--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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