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Provide a better explanation for the sizing of the boot partition, and

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reduce the size of the partition in the example from 128 blocks to 94
blocks so it will end on a 128-block boundary.  Also remove the -b
option from the next example.

MFC after:	3 weeks
This commit is contained in:
Dag-Erling Smørgrav 2012-01-13 12:40:33 +00:00
parent bcda432e01
commit 08a478a8e9
1 changed files with 14 additions and 10 deletions
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24
sbin/geom/class/part/gpart.8
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@ -960,17 +960,21 @@ partition that can boot
from a
.Cm freebsd-ufs
partition, and install bootstrap code into it.
This partition must be larger than
.Pa /boot/gptboot ,
or the GPT boot you are planning to write, but smaller than 545 KB.
A size of 15 blocks (7680 bytes) would be sufficient for
booting from UFS but 128 blocks (64 KB) is used in
this example to reserve some space for potential
future need (e.g.\& a larger
This partition must be larger than the bootstrap code
.Po
usually either
.Pa /boot/gptboot
or
.Pa /boot/gptzfsboot
for booting from a ZFS partition).
.Pc ,
but smaller than 545 kB since the first-stage loader will load the
entire partition into memory during boot, regardless of how much data
it actually contains.
This example uses 94 blocks (47 kB) so the next partition will be
aligned on a 64 kB boundary without the need to specify an explicit
offset or alignment.
.Bd -literal -offset indent
/sbin/gpart add -b 34 -s 128 -t freebsd-boot ad0
/sbin/gpart add -b 34 -s 94 -t freebsd-boot ad0
/sbin/gpart bootcode -p /boot/gptboot -i 1 ad0
.Ed
.Pp
@ -978,7 +982,7 @@ Create a 512MB-sized
.Cm freebsd-ufs
partition to contain a UFS filesystem from which the system can boot.
.Bd -literal -offset indent
/sbin/gpart add -b 162 -s 1048576 -t freebsd-ufs ad0
/sbin/gpart add -s 512M -t freebsd-ufs ad0
.Ed
.Pp
Create an MBR scheme on