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author | wblock <wblock@FreeBSD.org> | 2013-01-25 16:33:00 +0000 |
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committer | wblock <wblock@FreeBSD.org> | 2013-01-25 16:33:00 +0000 |
commit | 2390f6ef87cdbe1d5bcd77bc3c79e90a7ad5d5fa (patch) | |
tree | ede25f7a188bf68ab1c9db6269d0ed3746725bb1 /sbin/geom/class | |
parent | f2293255a968c5601acdd20c7bde624dd3a937dc (diff) | |
download | FreeBSD-src-2390f6ef87cdbe1d5bcd77bc3c79e90a7ad5d5fa.zip FreeBSD-src-2390f6ef87cdbe1d5bcd77bc3c79e90a7ad5d5fa.tar.gz |
Expand description of how gptboot and gptzfsboot choose a partition for
booting.
Reviewed by: ae
MFC after: 1 week
Diffstat (limited to 'sbin/geom/class')
-rw-r--r-- | sbin/geom/class/part/gpart.8 | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/sbin/geom/class/part/gpart.8 b/sbin/geom/class/part/gpart.8 index 61f8275..8843e53 100644 --- a/sbin/geom/class/part/gpart.8 +++ b/sbin/geom/class/part/gpart.8 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd January 3, 2013 +.Dd January 25, 2013 .Dt GPART 8 .Os .Sh NAME @@ -807,34 +807,51 @@ Both types of bootstrap code are used to boot from the GUID Partition Table. First, a protective MBR is embedded into the first disk sector from the .Pa /boot/pmbr image. -It searches the GPT +It searches through the GPT for a .Cm freebsd-boot partition (see the .Sx "PARTITION TYPES" -section) in the GPT and runs the next bootstrap stage from it. +section) and runs the next bootstrap stage from it. The .Cm freebsd-boot partition should be smaller than 545 KB. +It can be located either before or after other +.Fx +partitions on the disk. There are two variants of bootstrap code to write to this partition: .Pa /boot/gptboot and .Pa /boot/gptzfsboot . .Pa /boot/gptboot is used to boot from UFS. -It searches +It searches through +.Cm freebsd-ufs +partitions in the GPT and boots from the first one with the +.Cm bootonce +attribute set. +If that attribute is not found, +.Pa /boot/gptboot +boots from the first .Cm freebsd-ufs -GPT partitions and starts +partition with the +.Cm bootme +attribute set. +If neither attribute is found, +.Pa /boot/gptboot +boots from the first +.Cm freebsd-ufs +partition. .Pa /boot/loader .Pq the third bootstrap stage -if found. -The +is loaded from the first partition that matches these conditions. .Pa /boot/gptzfsboot is used to boot from ZFS. -It searches +It searches through the GPT for .Cm freebsd-zfs -GPT partitions and starts +partitions, trying to detect ZFS pools. +After all pools are detected, .Pa /boot/zfsloader -if found. +is started from the first one found. .Pp The VTOC8 scheme does not support embedding bootstrap code. Instead, the 8 KBytes bootstrap code image @@ -945,7 +962,7 @@ The GEOM PART class can detect the same partition table visible through different GEOM providers, and some of them will be marked as corrupt. Be careful when choosing a provider for recovery. If you choose incorrectly you can destroy the metadata of another GEOM class, -e.g.\& GEOM MIRROR or GEOM LABEL. +e.g.,\& GEOM MIRROR or GEOM LABEL. .Sh SYSCTL VARIABLES The following .Xr sysctl 8 |