freebsd at edvax.de
Sun Apr 29 21:05:57 UTC 2018
On Sun, 29 Apr 2018 23:48:04 +0530, Manish Jain wrote:
> On 04/29/18 22:00, Robert Fitzpatrick via freebsd-questions wrote:
> > Something happens to the bootcode since an upgrade a while back and I've
> > been starting this 10.4-RELEASE server at the loader OK prompt using
> > 'set currdev=disk0s1a' and then boot. Here is the server system...
> > root at dev:~ # gpart show
> > => 63 41942977 ada0 MBR (20G)
> > 63 41929587 1 freebsd [active] (20G)
> > 41929650 13390 - free - (6.5M)
> > => 0 41929587 ada0s1 BSD (20G)
> > 0 1024000 1 freebsd-ufs (500M)
> > 1024000 524288 2 freebsd-swap (256M)
> > 1548288 20480000 4 freebsd-ufs (9.8G)
> > 22028288 19901299 5 freebsd-ufs (9.5G)
> > I've tried the following to install the boot code, but still ending up
> > at the loader prompt...
> > root at dev:~ # gpart bootcode -b /boot/mbr ada0
> > bootcode written to ada0
> > I also tried with ada0s1 with same result. Clearly I don't understand
> > how to get this done, can someone help?
> Hi Robert,
> /boot/mbr needs you to set ada0s1 as the active partition. The easier
> solution in your case perhaps is:
> gpart bootcode -b /boot/boot0 ada0
> gpart bootcode -b /boot/boot ada0s1
As this seems to be a MBR setup, the commands should probably be:
# gpart bootcode -b /boot/mbr ada0
# gpart set -a active -i 1 ada0
# gpart bootcode -b /boot/boot ada0s1
Step 1 will add the regular MBR boot code, assuming this is a
FreeBSD-only system (no boot manager required).
Step 2 covers the case where the "active" flag has accidentally
been cleared; make sure it is set again (so the system will
recognize the partition s1 as being active, and attempt booting
by transfering control to it).
Step 3 will install the kernel loading mechanism for the slice
that hosts the FreeBSD partitions (and therefore continue booting
the kernel from /boot/kernel/kernel on /dev/ada0s1a, its default
See "man 8 boot" and "man gpart" (sec. EXAMPLES).
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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