Rock/Booting Linux

2014-03-02T00:17:18Z

Dsm: /* Modify the parameter */

{{Languages|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-

=== Build the kernel ===

git clone -b wip/rockchip-3.0-radxa-rock https://github.com/linux-rockchip/rockchip-3.0.git
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 [[rock/flash the image| flash the image]] to flash the generated boot.img to "boot" [[rock/partitions | partition]] parameter to "parameter" partition of your radxa rock board. And download a [http://dl.radxa.com/rock/images/ubuntu/latest/ prebuilt rootfs] or [[rock/ubuntu |make your own rootfs]]. You will get linux system boot into ramdisk and then switch root to real rootfs.

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Rock/Booting Linux