Re: Default MBR boot "manager"

On 11/11/13, 1:36 PM, Nathan Whitehorn wrote:
> On 11/11/13 15:35, Allan Jude wrote:
>> On 2013-11-11 16:32, Nathan Whitehorn wrote:
>>> On 11/11/13 15:19, Teske, Devin wrote:
>>>> Topic: Lenovo Laptops and bsdinstall zfsboot with MBR layout...
>>>>
>>>> Should we do the quick patch to change the default
>>>> from /boot/boot0 to /boot/mbr:
>>>>
>>>> Index: zfsboot
>>>> ===================================================================
>>>> --- zfsboot     (revision 258016)
>>>> +++ zfsboot     (working copy)
>>>> _at__at_ -764,7 +764,7 _at__at_ zfs_create_diskpart()
>>>>                   #
>>>>                   f_eval_catch $funcname gpart "$GPART_CREATE" mbr
>>>> \$disk ||
>>>>                                return $FAILURE
>>>> -               f_eval_catch $funcname gpart "$GPART_BOOTCODE"
>>>> /boot/boot0 \
>>>> +               f_eval_catch $funcname gpart "$GPART_BOOTCODE"
>>>> /boot/mbr \
>>>>                                \$disk || return $FAILURE
>>>>
>>>>                   #
>>>>
>>>> That would fix things for Lenovo laptops for the next
>>>> release until I finish up the bootcode selection menu.
>>>> I'd like to take my time in making sure Allan and I design
>>>> a worthy bootcode selection menu.
>>> This patch looks good (I don't remember why it was boot0 in the first
>>> place). I think gpart automatically installs something like /boot/mbr
>>> by default, so I'd be interested to know if making the diff purely
>>> negative still works.
>>>
>>> On another note, I think we should move away from a selector. Right
>>> now, we have three kinds of boot code:
>>> 1. ZFS boot code
>>> 2. UFS boot code
>>> 3. boot0
>>>
>>> Unifying 1 and 2 would help a lot -- I don't know of any reason we
>>> need both except for tradition. #3 is probably best done as a
>>> post-install config step ("Install FreeBSD boot manager" or
>>> something), which also means it works for UFS systems.
>>> -Nathan
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>> You have to do down right evil things to boot ZFS on MBR. dd'ing the
>> 'remainder' of the boot loader into a reserved space at the head of 
>> the
>> ZFS partition. The GPT boot code is 14k, and the code to boot ZFS is
>> 40k, whereas the UFS stuff is 512 bytes and fits in the intended slot.
>>
for mbr/zfs , just declare a zfs-boot slice type, and put it in there
sure it complicates it a bit but it is basically what happens in gpt 
right?

>
> We could just decide we won't support booting from ZFS on MBR. For 
> GPT, there is no size limit, which simplifies everything.
> -Nathan
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