boot code

[Bernt Hansson]

On 2016-02-29 19:45, Polytropon wrote:
> 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 outdated, old-fashioned, stupid and lame.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
>
Tried GPT and it ask for bootcode and not booting, so MBR it is.