ZFSBoot try and bsdlabel bootstrap code

[Doug Rabson]

On 20 Nov 2008, at 17:26, Ulf Lilleengen wrote:

> On Thu, Nov 20, 2008 at 04:07:50PM +0000, Doug Rabson wrote:
>>
>> On 19 Nov 2008, at 22:12, Olivier SMEDTS wrote:
>>
>>> Hello,
>>>
>>> I want to boot off a ZFS pool (version 13) on an USB stick for  
>>> testing
>>> purposes. But I'm stuck with the bsdlabel bootstrap code size...
>>> I'm using a 2 hours old CURRENT.
>>>
>>> # kldload usb2_storage_mass
>>> # kldload zfs
>>> # dd if=/dev/zero of=/dev/da0 bs=512 count=32
>>> # fdisk -BI da0
>>> # dd if=/dev/zero of=/dev/da0s1 bs=512 count=32
>>> # bsdlabel -wB -b /boot/zfsboot da0s1
>>> bsdlabel: boot code /boot/zfsboot is wrong size
>>>
>>> Is what I'm trying to do with bsdlabel wrong ?
>>> I previously tried with the default bootstrap code but I had an
>>> (expected) "boot: Not ufs" error at boot.
>>>
>>> PS : I'm not subscribed to this list.
>>
>> The process for install zfsboot is a bit manual (and undocumented).
> I see bsdlabel is restricted by BBSIZE. Could we perhaps increase  
> it? or is
> this something that will break everything? I suspect it might be  
> hard to
> maintain bsdlabel backwards compability with such a change. As an
> alternative, adding a flag for extended block size might be an option.

That won't help much - bsdlabel understands how to install bootcode  
for UFS only. The boot process for ZFS is a bit different.