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# git pull git://git.kernel.org/pub/scm/linux/

kernel/git/torvalds/linux-2.6.git

# cd linux-2.6

# cp arch/arm/configs/am200epdkit_defconfig .config

# make CROSS_COMPILE=arm-linux- ARCH=arm oldconfig

# make CROSS_COMPILE=arm-linux- ARCH=arm menuconfig

Then, select Device Drivers→Graphics support→Support for

framebuffer devices, and make sure to turn on the module

option for AM200 E-Ink EPD devkit support. Here’s the next

step, which builds some binaries:

# make CROSS_COMPILE=arm-linux- ARCH=arm

# arm-linux-objcopy -O binary -R .note -R .comment

-S arch/arm/boot/compressed/vmlinux linux.bin

# mkimage -A arm -O linux -T kernel -C none -a 0xa0008000

-e 0xa0008000 -n "uImage" -d linux.bin arch/arm/boot/uImage

This uImage file is what we will feed to the bootloader for

our kernel. We also need to copy the modules that are used

by the framebuffer drivers that we need to support X. We

need to transfer these files to the SD card. The simplest way

is to use an SD card reader and transfer it using your normal

desktop mechanism. For example:

# cp arch/arm/boot/uImage /media/sd/

# cp drivers/video/metronomefb.ko drivers/video/am200epd.ko

drivers/video/sys*.ko drivers/video/fb_sys_fops.ko /media/sd/

Once that’s done, you’re ready to boot your new kernel on

the Gumstix. To do this, you need to interrupt the normal boot

process. On the Gumstix serial console, type

reboot

, and press

any key to interrupt the normal boot process.

After that, you can use the following sequence of u-boot

commands to let u-boot read the SD card, then retrieve and

load the kernel into memory and finally boot from this memory:

# reboot

The system is going down NOW !!

Sending SIGTERM to all processes.

Please stand by while rebooting the system.

Restarting system.

U-Boot 1.1.4 (Nov 6 2006 - 11:20:03) - 400 MHz - 1161

*** Welcome to Gumstix ***

U-Boot code: A3F00000 -> A3F25DE4 BSS: -> A3F5AF00

RAM Configuration:

Bank #0: a0000000 64 MB

Flash: 16 MB

SMC91C1111-0

Can't overwrite "serial#"

Net: SMC91C1111-0

Hit any key to stop autoboot: 0

GUM>

GUM> mmcinit

MMC found. Card description is:

Manufacturer ID = 464450

HW/FW Revision = c c

Product Name = Name 3070FDP?

Serial Number = 7a6a16

Month = 3

Year = 2007

GUM> fatload mmc 1 a2000000 uimage.bin

reading uimage.bin

1094024 bytes read

GUM> bootm

## Booting image at a2000000 ...

Image Name: uImage

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 1093960 Bytes = 1 MB

Load Address: a0008000

Entry Point: a0008000

Starting kernel ...

Uncompressing Linux............

.......done, booting the kernel.

Welcome to the Gumstix Linux Distribution!

gumstix login: root

Password:

Welcome to Gumstix!

# uname -a

Linux gumstix 2.6.25gum-00000-ga052754 #16 PREEMPT

Wed Apr 30 22:54:35 EDT 2008 armv5tel unknown

Success! We now have booted a kernel with everything we

need. The next step is adding Xfbdev. With OpenEmbedded,

this step is fairly straightforward; simply execute the follow-

ing command:

# bitbake xserver-kdrive

This generates an appropriate package (.ipk) file in the

gumstix_build/tmp/deploy/ipk/armv5t/ directory. It should look

something like xserver-kdrive-fbdev_1.4-r1_armv5te.ipk. Copy

this file to the SD card, and use the following command to

install it on your Gumstix:

# ipkg install /mnt/mmc/xserver-kdrive-fbdev_1.4-r1_armv5te.ipk

If you have buildroot, the process is somewhat similar, but

you need to do some in-build munging. First, do the following:

# cd gumstix-buildroot

# make menuconfig

# # Go to Package Selection for Target-> then enable

# # the checkbox for the item labeled TinyX.

# # This is the other name for Xfbdev.

# make

This generates the Xfbdev and associated applications,

such as xterm, XLogo, xeyes and others. You can copy these to