U-Boot for Jalapeno (IPQ40xx) based boards

1. Build toolchain (http://buildroot.org)

git clone git://git.buildroot.net/buildroot
cd buildroot
git checkout 2018.08.x
make menuconfig

Select options:

• Target options -> Target Architecture -> ARM (little endian)
• Target options -> Target Architecture Variant -> cortex-A7
• Target options -> Target ABI -> EABI
• Toolchain -> GCC compiler Version -> gcc 5.x

Save and exit.

Build:

make toolchain

2. Build Caraboot (U-Boot)

cd ..
git clone https://github.com/8devices/Caraboot-ipq.git
cd Caraboot-ipq/
git checkout 8dev/jalapeno
./build.sh BOARD_NAME  #valid BOARD_NAMEs: jalapeno, habanero

If your toolchain is located elsewhere, you can build like this:

CROSS_COMPILE=/your_toolchain_dir/buildroot/output/host/usr/bin/arm-linux- ./build.sh BOARD_NAME

The bootloader binary will be saved to u-boot-jalapeno.elf or u-boot-habanero.elf. Use this file to upgrade bootloader on your board.

- ATTENTION! Bootloader upgrade is a risky operation and should not be performed unless
- absolutely necessary!
- If anything goes wrong during this process (power shortage, mistype, bad compile etc.)
- the board will be BRICKED (broken).
- Keep in mind that warranty does not cover module if it is damaged due to user's fault.

Make sure that you can reach your TFTP server over ethernet conncetion. Set ipaddr and serverip environment variables according to you network setup. Use these commands to upgrade from u-boot shell:

Jalapeno:

tftpboot 84000000 u-boot-jalapeno.elf
sf probe
sf erase 0xf0000 +0x80000
sf write 0x84000000 0xf0000 ${filesize}

Habanero:

tftpboot 84000000 u-boot-habanero.elf
sf probe
sf erase 0xf0000 +0x80000
sf write 0x84000000 0xf0000 ${filesize}