SystemConfig

1. toolchain
   https://sourcery.mentor.com/GNUToolchain/release858

    wget https://sourcery.mentor.com/GNUToolchain/package4571/public/arm-none-linux-gnueabi/arm-2009q1-203-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2  
    tar xjf arm-2009q1-203-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2  

1. kernel

    git clone git@github.com:cambridgehackers/device_xilinx_kernel.git  
    cd device_xilinx_kernel/  
    git checkout remotes/origin/december -b december  

1. compile

    cd s/git/device_xilinx_kernel/  
    git status  
    make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- xilinx_zynq_portal_defconfig  
    make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-   
    ./scripts/dtc/dtc -I dts -O dtb -o foo.dtb arch/arm/boot/dts/zynq-zc702-bridge.dts  

1. load
   cp arch/arm/boot/zImage foo.dtb ~
2. Making new ramdisk8M.image.gz (kernel requires that it be zero-padded to exactly 256kb)

    find . | cpio -H newc -o | gzip -9 -n | dd of=../imagefile.image.gz bs=256k iflag=fullblock conv=sync   

1. To examine ramdisk8M.image.gz

    gzip -cd ../imagefile.image.gz | cpio -imd   

1. Debugging clocks
   mount -t debugfs none /sys/kernel/debug/
   ls -l /sys/kernel/debug/clk/PS_CLK/IOPLL/FPGA1_CLK