Hi,

I'm currently playing with the Gigabyte MP30 AR0 board with an X-Gene 1 CPU from Applied Micro as we're evaluating ARM. A first try was to follow https://lists.centos.org/pipermail/arm-dev/2016-February/001626.html and chain loaded TianoCore and then CentOS or Debian (I'm more familiarwith TianoCore aswe work with OVMF a lot, in retrospect not the best idea as I could have worked with uboot).

Backstory aside, my problem is that after executing:

MP30AR0# setenv num_cores 1 MP30AR0# setenv DDRBASE2G 1 MP30AR0# save; reset

it shows just the first line from u-boot (the version string) and then boots directly into the builtin OpenLinux from Applied Micro, or a Ubuntu configured for u-boot if I insert that as USB device.

I have no access to the u-boot shell anymore and I'm also currently not able to read or change fw environment variable through a linux with u-boot-tools (fw_printenv, fw_savenenv) as I could not find a fw_env.conf file for this board.

cat /proc/mtd outputs: dev: size erasesize name mtd0: 000f0000 00010000 "Boot loader" mtd1: 00010000 00010000 "fdt" mtd2: 00f00000 00010000 "kern" mtd3: 01000000 00010000 "ramdisk"

With which I'm not able to write a /etc/fw_env.conf Reading /dev/mtd0 with `hexdump -C /dev/mtd0` or `strings -tx /dev/mtd0` allows me to guess where the env store starts and ends, I tried to map this guessing in a valid fw_env.conf but had no luck and always got a bad CRC.

Is there a way to really force the u-boot shell at boot so that I can reset it there or has any one experience with the board in question and has a valid fw_env.conf so that I can reset the respective vars through a Linux I'm able to boot?

My goal would be getting the u-boot shell again so that I can try booting into a Debian directly, or chain loading TianoCore if that does not work.

I hope I'm here on the correct list for this, if not I'm sorry and happy for all tips and pointers for a place where I can search/ask for this.

best regards, Thomas