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)
@@ -764,7 +764,7 @@ 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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