[syslinux] extlinux-4.0 can't boot on our platform.

[孤云独闲]

Hi All:
    Thank you for your help, fdisk information is as following:
         Disk /dev/sda: 320.1 GB, 320072933376 bytes
         255 heads, 63 sectors/track, 38913 cylinders
        Units = cylinders of 16065 * 512 = 8225280 bytes
        Disk identifier: 0x0003dc24

       Device Boot      Start         End      Blocks   Id  System
       /dev/sda1               1         528     4241128+  83  Linux
     /dev/sda2   *         529       38913   308327512+  83  Linux

 now i don't use compressed btrfs, i am sure that  sda2 is normally mounted
as '/', with directories '/boot' and
'/boot/extlinux' and files '/boot/extlinux/extlinux.sys' and
'/boot/extlinux/extlinux.conf' within that filesystem.



2010/7/8 H. Peter Anvin <hpa at zytor.com>

> On 07/07/2010 08:42 AM, H. Peter Anvin wrote:
> > On 07/06/2010 11:33 PM, 孤云独闲 wrote:
> >> Hi all:
> >>      my filesystem is btrfs. /boot and / is  on the same
> >> partition(/dev/sda2,
> >> format btrfs).  i install syslinux as following:
> >>       1.  rpm  -ivh syslinux-4.00-1.i386.rpm
> >> syslinux-extlinux-4.00-1.i386.rpm syslinux-tftpboot-4.00-1.i386.rpm
> >>       2.  extlinux-i /boot/extlinux. (the extlinux.sys can't be create
> >> on the
> >> directory).
> >>       3.  i copy extlinux.conf to  /boot/extlinux . (of course , i
> >> have edit
> >> the extlinux.conf)
> >>       4. extlinux -U  /boot/extlinux
> >>      5.  cat /usr/share/syslinux/mbr.bin>/dev/sda.
> >>
> >> i reboot , but the system can't boot,  the screen show tips "No
> >> DEFAULT or
> >> UI configuration directive found!" , i doubt mbr isn't installed.
> >>      do you tell me why and what  i do next?
> >>
> >
> > Are you using compressed btrfs?  We don't handle that yet.
> >
>
> A bit of clarification:
>
> The plan for btrfs was (and still is) for compression to be per
> subvolume, which would naturally have lent itself to /boot being a
> subvolume with no compression.  Unfortunately, this has not yet gotten
> implemented in btrfs, which means we're a bit stuck.
>
> I'm currently looking at adding compression support to Syslinux, but it
> is a nontrivial undertaking.
>
>        -hpa
>
> --
> H. Peter Anvin, Intel Open Source Technology Center
> I work for Intel.  I don't speak on their behalf.
>
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-- 
Best Regards,
tomsun