Rock/Booting Linux

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Requirement

• a radxa rock board(full version or lite version)
• a desktop/laptop running Linux(64bit preferred)
• a micro usb cable, one side plugged in to the OTG port of radxa rock, the other side plugged in to the usb port on desktop/laptop

Install the toolchain

Install ARM toolchain and building kernel related pacakges if you don't have them on your host.

   sudo apt-get install gcc-arm-linux-gnueabihf
   sudo apt-get install lzop libncurses5-dev
   export ARCH=arm
   export CROSS_COMPILE=arm-linux-gnueabihf-

Get the source code

   git clone -b wip/rockchip-3.0-radxa-rock https://github.com/linux-rockchip/rockchip-3.0.git

or download from this link and unzip it:

   https://github.com/linux-rockchip/rockchip-3.0/archive/wip/rockchip-3.0-radxa-rock.zip

Build the kernel

   cd rockchip-3.0
   make rk3188_radxa_rock_defconfig
   make -j8

The kernel will be at arch/arm/boot/Image

Build the kernel modules

   mkdir modules
   export INSTALL_MOD_PATH=./modules
   make modules && make modules_install
   cd ..

Now you have all the kernel modules in modules/lib/modules/3.0.36+/.

Generate the ramdisk

   git clone https://github.com/radxa/initrd.git
   make -C initrd

Generate the boot.img

   wget http://dl.radxa.com/rock/tools/linux/mkbootimg
   sudo apt-get install lib32stdc++6
   chmod +x mkbootimg
   ./mkbootimg --kernel rockchip-3.0/arch/arm/boot/Image --ramdisk initrd.img -o boot.img

Done. Now we have the kernel boot.img for RR.

Modify the parameter

The linux rootfs maybe in the different partition or media(nand or uSD card or USB disk), so you need to tell the kernel which is the right rootfs to mount. So change the root= command line in your parameter to the rootfs you want to mount. The examples are:

   root=/dev/block/mtd/by-name/linuxroot        # rootfs in the nand partition named "linuxroot"
   root=/dev/mmcblk0p1          # rootfs in the uSD card first partition
   root=/dev/sda1                # rootfs in the U disk or the USB hard drive first partition
   root=LABEL=linuxroot         # rootfs in the partition with label "linuxroot", can be in uSD, U disk or USB hard drive.

Next step

Now you refer flash the image to flash the generated boot.img to "boot" partition parameter to "parameter" partition of your radxa rock board. And download a prebuilt rootfs or make your own rootfs. You will get linux system boot into ramdisk and then switch root to real rootfs.