[indiana-discuss] "zio_read_data failed" in GRUB while trying to boot from compact flash (CF)

[Cindy.Swearingen at Sun.COM]

Hi James,

It was as the zio error that caught my attention as I have a superficial 
understanding of GRUB/x86-based booting.

I found only two bugs with the zio error message. One was fixed and then 
6843138, which seems to describe your boot error scenario, although
without the greater than 1 TB disk factor, is fixed in a later build.

Someone more experienced will have to comment.

Cindy

James Lee wrote:
> Cindy.Swearingen at Sun.COM wrote:
> 
>>Hi James,
>>
>>No answers from me, just some information.
>>
>>The ability to boot from a disk greater than 1 TB integrated last fall
>>and this support is in the OpenSolaris 2009.06 release.
>>
>>I see the same zio_read_data error (boot from install okay, but not
>>from the disk) in this CR:
>>
>>6843138 can not boot off of a 2.2TB and zfs root
>>
>>The root cause seems to be that the that BIOS is not reporting correct
>>capacity.
>>
>>This CR is fixed in Nevada, build 117. If someone can get you the stage2
>>binary from build 117, then we would know for sure that is bug is your
>>issue.
> 
> 
> Thanks Cindy.  I think we may be onto something with this.  I grabbed
> c62013fcda99 from hg where this fix was committed and compiled GRUB.  I
> installed the stages like:
> 
> # installgrub stage1 stage2 /dev/rdsk/c7d0s0
> 
> And GRUB actually loaded menu.lst and the splash image!  This is the
> furthest I've gotten so far.  Unfortunately, it can't read the kernel now:
> 
> 
>>loading '/platform/i86pc/kernel/$ISADIR/unix -B $ZFS-BOOTFS,console=graphics' ...
>>cpu: 'GenuineIntel' family 6 model 7 step 7
>>[BIOS accepted mixed-mode target setting!]
>>zio_read_data failed
>>
>>Error 15: File not found
>>
>>Press any key to continue...
> 
> 
> 
> 
> Back in GRUB:
> 
> 
>>grub> find /platform/i86pc/kernel/unix
>>zio_read_data failed
>>
>>Error 15: File not found
> 
> 
> 
> 
> So what would cause GRUB to be able to load /rpool/boot/grub/menu.lst
> fine but not /platform/i86pc/kernel/unix?
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