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1 Barebox

1.1 BeagleBoneGreen

At the time of writing, barebox officially supports the BeagleBone but not u-boot.

Barebox also is more similar to GNU/Linux command line than u-boot.
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Theses instructions require:

  • An USB/Serial adapter to get the serial console
  • A microUSB cable
  • A computer with Parabola
  • Optionally 4GB of space for backing up the internal eMMC in case something goes wrong.
  • Optionally a 4GB microSD for recovery

First make sure that you have a compiler that can produce arm binaries

$ sudo pacman -S arm-none-eabi-gcc

Then we have to download and build barebox since we have no packages or binaries yet:

$ git clone git://
$ cd barebox
$ export ARCH=arm
$ export CROSS_COMPILE=arm-none-eabi-
$ make am335x_mlo_defconfig
$ make
$ make am335x_defconfig 
$ make

This will produce many binaries, for many different devices. The only ones that interest us here are:

  • images/barebox-am33xx-beaglebone.img
  • images/barebox-am33xx-beaglebone-mlo.img

Then we will backup the default image for recovery purpose and use the default u-boot to install barebox.

First interrupt the startup in u-boot by following what it says on the serial console, then in u-boot a prompt will appear. You can then access the internal eMMC with this command:

ums 0 mmc 1

You can make a backup of it with ddrescue:

ddrescue /dev/sdZ beaglebone-eMMC.img beaglebone-eMMC.log

To install barebox, use fdisk to format the disk with MBR paritions: Remove any existing partitions and create the first partition at the beginning as FAT32 Then set it bootable (not sure if it's required) Then format it as vfat:

mkfs.vfat -n BOOT /dev/sdZ1

Then mount it and copy barebox on it:

$ sudo mount /dev/sdZ1 /mnt
$ sudo cp images/barebox-am33xx-beaglebone-mlo.img /mnt/MLO
$ sudo cp images/barebox-am33xx-beaglebone-mlo.img /mnt/barebox.bin

Then at next power on, the board will be running barebox.