Hacking Linux for chumby

Existing Software
See existing Chumby Software Applications, Scripts and Tools already on your Chumby stock linux distro.

Installing the toolchain
First, install the GNU Toolchain (gcc 4.3.2)

Build the kernel
The following instructions will compile the Linux 2.6.28 kernel shipped with chumby silvermoon/opus firmware version 1.8.1:

mkdir kernel cd kernel wget http://files.chumby.com/source/silvermoon/silvermoon-1.8.1/linux-2.6.28.tgz tar zxvf linux-2.6.28.tgz cd linux-2.6.28 ARCH=arm CROSS_COMPILE=arm-linux- make
 * Once the build completes, remount your root partition on your silvermoon unit read/write via:
 * Copy the freshly built kernel from arch/arm/boot/zImage on your build system to /boot/vmlinuz on the target silvermoon device
 * run sync on the target silvermoon device, then reboot

Installing the toolchain
First, install the GNU Toolchain (gcc 4.3.2)

Build the kernel
The following instructions will compile the Linux 2.6.28 kernel shipped with chumby silvermoon firmware version 1.0.3:

mkdir kernel cd kernel wget http://files.chumby.com/source/silvermoon/silvermoon-1.0.3/linux-2.6.28-silvermoon-1.0.3.tar.gz tar zxvf linux-2.6.28-silvermoon-1.0.3.tar.gz cd linux-2.6.28-silvermoon-1.0.3 ARCH=arm CROSS_COMPILE=arm-linux- make
 * Once the build completes, remount your root partition on your Silvermoon unit read/write via:
 * Copy the freshly built kernel from arch/arm/boot/zImage on your build system to /boot/vmlinuz on the target silvermoon device
 * run sync on the target silvermoon device, then reboot

Building and installing a new chumby One kernel
config_util --cmd=putblock --dev=/dev/mmcblk0p1 --block=krnA < /mnt/storage/zImage
 * 1) Install an ARM Linux toolchain, such as the 4.3.2 GNU Toolchain
 * 2) Download
 * 3) Configure the kernel as you like, by running **make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- menuconfig**
 * 4) *The CROSS_COMPILE= arguments may vary depending on your toolchain's prefix. Code Sourcery uses arm-none-linux-gnueabi- by default, but arm-linux- has also been used in the past
 * 5) Compile the kernel by running **make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-**
 * 6) Install modules to a local directory by running **INSTALL_MOD_PATH=[path-to-temp-rfs] make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- modules_install**
 * 7) Copy the contents of your temp RFS to / on the chumby. This should end up putting new files in /lib/modules
 * 8) Copy arch/arm/boot/zImage to the chumby, somewhere temporary like /mnt/storage/
 * 9) Determine which RFS you're in. If /proc/cmdline contains "root=/dev/mmcblk0p2" you're in rfsA.  If it contains "root=/dev/mmcblk0p3", you're in rfsB.
 * 10) Write the new kernel. Use krnA if you're in rfsA, and krnB if you're in rfsB:

Installing the toolchain
First, install the GNU Toolchain (gcc 4.3.2)

Build the kernel
The following instructions will compile the Linux 2.6.16 kernel shipped with chumby firmware version 1.7:

mkdir kernel cd kernel wget http://files.chumby.com/source/ironforge/build396/align.pl wget http://files.chumby.com/source/ironforge/build1.7.1649/linux-2.6.16-chumby-1.7.0.tar.gz tar zxvf linux-2.6.16-chumby-1.7.0.tar.gz cd linux-2.6.16-chumby-1.7.0 ARCH=arm BOARD=mx21ads CROSS_COMPILE=arm-linux- make perl ../align.pl arch/arm/boot/zImage zip k1.bin.zip arch/arm/boot/zImage

Installing the toolchain
First, install the GCC 4.1.2b toolchain

Build the kernel
The following instructions will compile the Linux 2.6.16 kernel shipped with chumby firmware version 1.6:

mkdir kernel cd kernel wget http://files.chumby.com/source/ironforge/build396/align.pl wget http://files.chumby.com/source/ironforge/build733/linux-2.6.16-chumby-1.6.0.tar.gz tar zxvf linux-2.6.16-chumby-1.6.0.tar.gz cd linux-2.6.16-chumby-1.6.0 ARCH=arm BOARD=mx21ads CROSS_COMPILE=arm-linux- make perl ../align.pl arch/arm/boot/zImage zip k1.bin.zip arch/arm/boot/zImage

Installing the toolchain
First, install the GCC 4.1.2b toolchain

Build the kernel
The following instructions will compile the Linux 2.6.16 kernel shipped with chumby firmware version 1.5:

mkdir kernel cd kernel wget http://files.chumby.com/source/ironforge/build396/align.pl wget http://files.chumby.com/source/ironforge/build565/linux-2.6.16-chumby-1.5.0.tar.gz tar zxvf linux-2.6.16-chumby-1.5.0.tar.gz cd linux-2.6.16-chumby-1.5.0 ARCH=arm BOARD=mx21ads CROSS_COMPILE=arm-linux- make perl ../align.pl arch/arm/boot/zImage zip k1.bin.zip arch/arm/boot/zImage

Be sure you build with the correct toolchain!

Installing the kernel image

 * create an update2 directory on the root of a USB storage drive
 * copy k1.bin.zip to the update2 directory on the USB storage drive
 * insert the USB storage drive into chumby
 * hold the touch screen down and power on the chumby (keep holding the screen for 5 seconds)
 * once the device has booted into special options mode, click Install updates
 * click Install from USB flash drive

Building the Wi-Fi driver
If you've followed the steps above to build the chumby 1.7 linux kernel, you should be able to build the Ralink rt73 driver by doing the following:

cd kernel wget http://files.chumby.com/source/ironforge/build1.7.1649/rt73-chumby-1.7.0.tar.gz tar zxvf rt73-chumby-1.7.0.tar.gz cd rt73-chumby-1.7.0/Module/ make ARCH=arm CROSS_COMPILE=arm-linux- KERNDIR=../../linux-2.6.16-chumby-1.7.0 arm

Alpha Prototype
The Alpha Prototype chumby runs a modified linux 2.4.20 kernel.

Compiling the Kernel

First, install the GCC Toolchain (gcc 3.3.2) - this toolchain is only for use with the prototypes.

In order to build the chumby kernel, you can download the kernel source from chumby_kernel.tgz and build by doing the following:

(then immediately exit and save the config)
 * 1) mkdir kernel
 * 2) cd kernel
 * 3) tar zxvf chumby_kernel.tgz
 * 4) make menuconfig
 * 1) make dep
 * 2) make Image

If all goes well, you should end up with an uncompressed kernel image at arch/arm/boot/Image.

Ironforge
The "Ironforge" production chumby runs Linux 2.6.16 kernel.

First install the GNU Toolchain (gcc 4.1.2) - this toolchain is for use with the production units. Older toolchains may not work.

In order to build the chumby kernel, you can download the kernel source from linux-2.6.16-chumby-1.0.tar.gz and build by doing the following, NOT as root, but as a normal user.

$ mkdir kernel $ cd kernel $ tar zxvf linux-2.6.16-chumby-1.0.tar.gz $ cd linux-2.6.16 $ cp arch/arm/configs/mx21ads_defconfig .config $ ARCH=arm BOARD=mx21ads CROSS_COMPILE=arm-linux- make oldconfig (select 'Y' when asked if you wish to build in the 224 color Turbochef logo) $ ARCH=arm BOARD=mx21ads CROSS_COMPILE=arm-linux- make

If all goes well, you should end up with a compressed kernel image at arch/arm/boot/zImage and all of loadable kernel modules under the drivers directory.

By default, there are only 3 drivers built with this configuration:

$ find drivers -name *.ko Which should return: drivers/char/chumby_accel.ko drivers/char/chumby_sense1.ko drivers/char/chumby_timer.ko drivers/mfd/chumby-tsc2100.ko

Warning, this configuration will not get you a working kernel! Do not use just yet...

You might want to enable more modules to get the recommended: Which should return: drivers/media/video/cpia.ko drivers/media/video/compat_ioctl32.ko drivers/media/video/cpia_usb.ko drivers/media/video/v4l1-compat.ko drivers/media/video/v4l2-common.ko drivers/media/video/videodev.ko drivers/bluetooth/hci_usb.ko drivers/bluetooth/hci_vhci.ko drivers/video/console/bitblit.ko drivers/video/console/fbcon.ko drivers/video/console/fbcon_ccw.ko drivers/video/console/fbcon_cw.ko drivers/video/console/fbcon_rotate.ko drivers/video/console/fbcon_ud.ko drivers/video/console/font.ko drivers/video/console/softcursor.ko drivers/char/chumby_accel.ko drivers/char/chumby_sense1.ko drivers/char/chumby_timer.ko drivers/usb/media/dsbr100.ko drivers/usb/net/asix.ko drivers/usb/net/cdc_ether.ko drivers/usb/net/pegasus.ko drivers/usb/net/usbnet.ko drivers/usb/input/usbhid.ko drivers/mfd/chumby-tsc2100.ko
 * 1) find drivers -name *.ko