Re: sys/boot/boot0/boot0.S - r186598

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On 09/01/2011 04:38, Daniel Braniss wrote:
There was a post on the embedded list that suggested this work around:=

echo 'a 2' | fdisk -f /dev/stdin ad0
boot0cfg -s 2 ad0

There are 2 issues with this:
1) It can't be done without setting kern.geom.debugflags to 0x10.
2) It resulted in most/all commands resulting in the error message
"Device not configured" including the second command and 'shutdown -r =
now=3D
'.

Both of which leave this really work around fairly broken.
the problem is that boot0cfg -s does NOT update the boot block, it fail=
s!
the work around is:
boot0cfg -s -t n dev
then
gpart set -a active -i n dev

danny

Hi Danny,

The bug does not seem to be in boot0cfg as:

1) It succeeds to write the new configuration to the boot block every
time i have tried.
2) It does not touch the partition table at all only the mbr, so it was
never designed to change the active partition.

arguable, since it used to work.


If this is not a bug in boot0 then its a bug in the man pages for
boot0cfg as it does make reference to having to change the active slice
to make this work.

the problem is not as simple as it looks, and I don't have all the answers, but after spendig much time on this, it seems that not all BIOSes behave
in a 'standard way' :-)

danny


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