Compile a uBoot Kernel

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Revision as of 15:27, 24 November 2008 by Sdnalloh (Talk | contribs)

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This is a tutorial of how to compile a uBoot kernel from vanilla gentoo-sources.

Contents

Get the sources

Right now (24 Nov 2008) the latest stable version is gentoo-sources-2.6.26-r2. If you want a newer kernel, simply edit /etc/portage/package.keywords and add this line: sys-kernel/gentoo-sources ~ppc

then download the kernel sources

  1. emerge -ua gentoo-sources

make a link to the kernel sources

  1. cd /usr/src
  2. ln -sfn linux-2.6.26-gentoo-r2 linux



Edit your kernel config

Clean up before you begin

  1. cd /usr/src/linux
  2. make mrproper

Use the default KuroBox config

  1. cp arch/powerpc/configs/linkstation_defconfig .config

Make sure the config is sane

  1. make menuconfig

The default config is minimal. You'll have to enable support for any non-standard things you may be using. I use reiserfs and netatalk, so I enabled support for that filesystem and also for appletalk.


Compile your kernel

  1. make uImage && make modules && make modules_install

Sit back and listen to music. Go to the store. Wash the dog.


Backup your old kernel and dtb file

  1. cp /boot/uImage /boot/uImage.bak
  2. cp /boot/kuroboxHG.dtb /boot/kuroboxHG.dtb.bak


Compile the dtb file

  1. cd /usr/src/linux/arch/powerpc/boot/dts
  2. ../dtc -I dts -O dtb -V 16 -o /tmp/kuroboxHG.dtb kuroboxHG.dts
  3. cp /tmp/kuroboxHG.dtb /boot/kuroboxHG.dtb


Install the kernel

  1. cp /usr/src/linux/arch/powerpc/boot/uImage /boot/uImage


Reboot

  1. reboot

With any luck, you'll be booting your new kernel.


Troubleshooting

If something goes wrong, simply boot in EM mode and copy your old kernel back.

  1. cp /boot/uImage.bak /boot/uImage
  2. cp /boot/kuroboxHG.dtb.bak /boot/kuroboxHG.dtb
  3. echo -n "OKOK" > /dev/fl3