Booting the Beaglebone Black from internal flash

[Otacílio]

Em 22/05/2016 15:53, William Waites escreveu:
> I've gotten my BBB to boot and run off of its internal flash. It wasn't
> terribly difficult and maybe this is old news, but I had a lot of
> trouble finding instructions for how to do it. Here's what I did, in
> case it's useful.
>
>    1. Start from an image written to SD card. At the time of writing
>       there seems to be a problem with the 11 images, but 10.3 works
>       fine.
>
>    2. Delete any existing partitions from the internal flash, as well as
>       the partition table so that we can start from scratch:
>
>       gpart delete -i 2 mmcsd1
>       gpart delete -i 1 mmcsd1
>       gpart destroy mmcsd1
>
>    3. Create partitions similarly to the SD card:
>
>       gpart create -s GPT mmcsd1
>       gpart add -t \!12 -b 63 -s 2M mmcsd1
>       gpart set -a active -i 1 mmcsd1
>       gpart add -t freebsd mmcsd1
>       gpart add -t freebsd-ufs mmcsd1s2
>       
>       It is unclear if it is necessary or why to use a traditional
>       disklabel here instead of just putting the freebsd-ufs directly in
>       slice 2.
>
>    4. Create filesystems:
>
>       newfs_msdos -F 12 /dev/mmcsd1s1
>       newfs -U -t /dev/mmcsd1s2a
>
>       These filesystems do not (yet) have labels so they won't be
>       magically found by the boot process. It does not appear to be
>       possible to label them while there are other filesystems mounted
>       with those labels.
>
>    5. Mount the filesystems:
>
>       mount /dev/mmcsd1s2a /mnt
>       mkdir -p /mnt/boot/msdos
>       mount -t msdosfs /dev/mmcsd1s1 /mnt/boot/msdos
>
>    6. Copy the running system onto the internal flash:
>
>       cd /boot/msdos; tar -cf - ./ | (cd /mnt/boot/msdos; tar -xpvf -)
>       cd /; tar --one-file-system -cf - ./ | (cd /mnt; tar -xpvf -)
>
>       This could alternatively be done by building from source, and
>       installing with DESTDIR=/mnt or potentially using the distribution
>       sets. Except perhaps for the early bootloader stages which come
>       from the sysutils/u-boot-beaglebone port I believe.
>
>    7. Make sure that booting will proceed from the internal flash,
>       because the default in u-boot is to use mmc 0 (the external SD
>       card).
>
>       echo 'fatdev=mmc 1' > /mnt/boot/msdos/uenv.txt
>
>    8. Halt the system, remove the SD card, boot into single user mode to
>       label the disks. The kernel will not be able to find the root
>       partition, and it needs to be specified as ufs:/dev/mmcsd0s2a when
>       asked.
>
>       glabel label MSDOSBOOT mmcsd0s1
>       glabel label rootfs mmcsd0s2a
>
>       Notice that now the device is mmcsd0 and not mmcsd1. This is
>       because of the way the numbering works which is slightly
>       inconvenient.
>
>    9. Reboot and done.
>
>    9a. Not really, for me the kernel was still unable to find the
>        filesystem with rootfs label, and I resorted to building a kernel
>        with
>
>        options         ROOTDEVNAME=\"ufs:mmcsd0s2a\"
>
>        The default in the BEAGLEBONE config is ufs:mmcsd0s2 which would
>        probably have worked if not using BSD disklabels and putting the
>        filesystem directly there (see #3).
>
> Is it a good idea to write this down in the wiki?
>
> Best wishes,
> -w
>

I think that this is a great improvement to the wiki, but this is not my 
decision. About the support of FreeBSD to the internal  flash memory, is 
it robust sufficiently to be used without panics?

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-Otacílio