U-Boot for Rambutan based boards

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

Download:

cd your_work_dir
git clone git://git.buildroot.net/buildroot

Configure:

cd buildroot
make menuconfig

In Target Options select Target Architecture as MIPS (big endian) and Target Architecture Variant as mips 32r2. In Toolchain select GCC Compiler version as gcc 4.7.x. Save and exit.

Build:

make

2. Build Caraboot image

Download:

cd your_work_dir
git clone https://github.com/8devices/Caraboot-nand.git
cd Caraboot-nand/
git checkout caraboot

Build:

make rambutan_defconfig
CROSS_COMPILE=your_work_dir/buildroot/output/host/usr/bin/mips-linux- make

The bootloader binary will be saved to u-boot.bin file. You can now use this file to upgrade your bootloader on Rambutan board.

To build SPI version:

make rambutan_spi_defconfig
CROSS_COMPILE=your_work_dir/buildroot/output/host/usr/bin/mips-linux- make