boot code

[Polytropon]

On Mon, 29 Feb 2016 19:25:45 +0100, Bernt Hansson wrote:
> On 2016-02-28 23:58, Polytropon wrote:
> > On Sun, 28 Feb 2016 23:38:49 +0100, Bernt Hansson wrote:
> >> Hello list!
> >>
> >> I need to get the boot code on a hdd.
> >> Tried boot0cfg and fdisk -B /dev/ada1
> >>
> >> But upon a reboot choosing the hdd it just don´t boot.
> >
> > The disk needs to have at least one partition that's marked
> > as active, if I remember correctly. This is the "old way"
> > of initializing it:
> >
> > 	# fdisk -BI /dev/ada1
> > 	# bsdlabel -B -w ada0s1
> >
> > Add "-b /boot/boot0" for the fdisk command if you need to
> > specify the boot code (normal boot or boot manager).
> >
> > If you want to use the whole disk as a "dedicated partition",
> > you can do this:
> >
> > 	# bsdlabel -w ada1
> > 	# bsdlabel -e ada1
> > 		set type "4.2BSD" for 'a' partition
> > 		make 'a' same size as 'c'
> > 		save
> > 	# newfs -m 0 -i 16384 -b 16384 -f 2048 -U -t enable -n disable -L ssdroot /dev/ada1a
> > 	# bsdlabel -B ada1
> >
> > Adjust -i, -b and -f according to the expected usage.
> > But that's not a very kind way to deal with disks. :-)
> >
> > You should use gpart today. There is good documentation
> > in "man gpart", as well as those resources:
> >
> > http://www.wonkity.com/~wblock/docs/html/disksetup.html
> >
> > https://www.freebsd.org/doc/handbook/disks-adding.html
> >
> > http://www.freebsd.org/doc/handbook/geom-glabel.html
> >
> > Avoid MBR partitioning if possible - it's considered obsolete,
> > outdated, old-fashioned, stupid and lame. ;-)
> >
> Thank you but no cigar.
> 
> The machine is amd64 10.2-R so my guess its gpt.

10.2 and amd64 doesn't exclude the use of MBR or dedicated. :-)
When using GPT, both fdisk and bsdlabel are quite useless.
(They are also obsolete as gpart can do MBR partitioning, too.)

So in your case, the following approach should work:

	# gpart create -s gpt ada1
	# gpart add -t freebsd-boot -l gpboot -b 40 -s 512K ada1
	# gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada1

After installing the boot code, add data partions as desired:

	# gpart add -t freebsd-ufs -l gprootfs -b 1M -s <size> ada1

Refer to:

http://www.wonkity.com/~wblock/docs/html/disksetup.html#_the_new_standard_gpt



-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...