4.13.3.39. ZII i.MX7D Based Boards

4.13.3.39.1. Building Barebox

To build Barebox for ZII i.MX7 based boards do the following:

make ARCH=arm CROSS_COMPILE=<ARM toolchain prefix> mrproper
make ARCH=arm CROSS_COMPILE=<ARM toolchain prefix> imx_v7_defconfig
make ARCH=arm CROSS_COMPILE=<ARM toolchain prefix>

4.13.3.39.2. Uploading Barebox via JTAG

Barebox can be bootstrapped via JTAG using OpenOCD (latest master) as follows:

cd barebox
Documentation/boards/imx/zii-imx7d-dev/bootstrap.sh

A custom OpenOCD binary and options can be specified as follows:

OPENOCD="../openocd/src/openocd -s ../openocd/tcl " \
  Documentation/boards/imx/zii-imx7d-dev/bootstrap.sh

4.13.3.39.3. Disabling DSA in Embedeed Switch

Booting the Linux kernel that the device ships with will re-configure the on-board switch into DSA mode, which would make the Ethernet connection unusable in Barebox. To undo that and re-configure the switch into dumb/pass-through mode, do the following:

memset -b -d /dev/switch-eeprom 0x00 0xff 4

Once that is done, power cycling the device should force the switch to re-read the EEPROM and reconfigure itself.