Re: booting BeagleBoneGreen

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

On Mon, 11 Jan 2016, John D. Baker wrote:

> Booting the pre-installed Linux presents a disk device:
> [snip] 
> but there is nothing recognizable to 'fdisk':
> [snip] 
> 'disklabel' just shows the default partitioning
> 
> 4 partitions:
> #        size    offset     fstype [fsize bsize cpg/sgs]
>  a:    196608         0     4.2BSD      0     0     0  # (Cyl.      0 -     95)
>  d:    196608         0     unused      0     0        # (Cyl.      0 -     95)

After a bit more poking around, I figured out what it's doing.  The
onboard eMMC (Linux /dev/mmcblk0) contains 2 partitions:  a 96MB W95
FAT16LBA partition and the rest as a Linux ext4 partition.  The Linux
File-CD Gadget is exporting the FAT partition directly, so 'fdisk' and
'disklabel' on a NetBSD host are mostly meaningless.  Just mount /dev/sdNa
or /dev/sdNd as type MSDOS.

Except for a couple of Debian-related scripts, the contents seem primarily
geared for users on redmondOS hosts.

In case they need to be extracted/preserved for constructing bootable
media, "MLO" seems to be in:

  /opt/source/pru-software-support-package/pru_cape/bin/MLO/beaglebone_black/MLO
  /opt/source/pru-software-support-package/pru_cape/bin/MLO/beaglebone/MLO
  /opt/backup/uboot/MLO

and "u-boot.img" seems to be in

  /opt/backup/uboot/u-boot.img

on the ext4 Linux filesystem.  The "uEnv.txt" file is in "/boot".

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