GuruPlug Kernel

Kernel Sources

• Kernel sources: linux-2.6.33.3.tar.bz2
• Kernel patches: Guruplug-patchset-2.6.33.2.tar.bz2

Compile

• PlugWiki:Re-building_the_kernel_and_U-Boot
• on another Debian GNU/Linux (Squeeze) arm machine (a QNAP TS-219)
• should also work with a cross-compiler

make guruplug_config
make menuconfig
make-kpkg kernel_image kernel_headers
make uImage

Note: a suitable Kernel image can be downloaded below.

Installation

• PlugWiki:Reflashing_images_on_the_GuruPlug
• in u-boot
• uImage on tftp server on another machine, that has also a rarpd running (Debian packages tftpd, rarpd, file /srv/tftp/uImage, and /etc/ethers with the MAC and IP addresses of the plug)

Testing

• load the image into RAM, and boot into a bash

rarp 0x6400000 uImage
setenv bootargs console=ttyS0,115200 ubi.mtd=2 root=ubi0:rootfs rootfstype=ubifs init=/bin/bash
bootm 0x6400000

Production

• boot into the system using a known running kernel (the shipped one) and install the linux-image and linux-headers .deb packages (see Downloads below), then reboot and go into u-boot
• load image into RAM, save it to the flash, and boot the system
• Debian on partition 4 of the SD card:
  • PlugWiki:SD_Card_As_Root_File_System
  • PlugForum:1674, PlugForum:1642

rarp 0x6400000 uImage
nand erase 0x100000 0x400000
nand write.e 0x6400000 0x100000 0x400000
setenv bootargs 'console=ttyS0,115200 rootwait root=/dev/sdb4'
saveenv
boot

Here’s a dump of my u-boot environment variables:

GuruPlug>> printenv
bootdelay=3
baudrate=115200
ethact=egiga0
ethaddr=00:50:43:01:82:38
eth1addr=00:50:43:01:82:39
bootargs_old=console=ttyS0,115200 ubi.mtd=2 root=ubi0:rootfs rootfstype=ubifs
bootargs=console=ttyS0,115200 rootwait root=/dev/sdb4
bootcmd=nand read.e 0x6400000 0x100000 0x400000; bootm 0x6400000;
stdin=serial
stdout=serial
stderr=serial

Download

• guruplug-linux-2.6.33.3flipflip.tar.gz (14MiB) – built on Debian Squeeze
  • Installation on Debian Squeeze: dpkg -i *deb
  • Installation on Debian Lenny: dpkg -i --force-all *deb

Advanced

• Using a kernel image and an initrd image would be nice.
• The kernel flash partition is too small (4MiB)
  • Kernel image: ~2.5 MiB
  • initrd image: ~3.5 MiB

mkimage -n linux-2.6.33.3flipflip -A arm -O linux -T kernel -C none -a 0x000800000 -d /boot/vmlinuz-2.6.33.3flipflip /boot/uImage
sed -i '/MODULES/s/most/dep/' /etc/initramfs-tools/initramfs.conf 
update-initramfs -v -c -k 2.6.33.3flipflip
mkimage -n '2.6.33.3flipflip initrd' -A arm -O linux -T ramdisk -C none -a 0x01100000 -d /boot/initrd.img-2.6.33.3flipflip /boot/uInitrd

And then boot using something like this:

setenv bootargs console=ttyS0,115200 rootwait root=/dev/sdc4
setenv bootcmd 'usb start; ext2load usb 1:4 0x1100000 /boot/uInitrd; ext2load usb 1:4 0x0800000 /boot/uImage; bootm 0x000800000 0x01100000;'
boot

See also

• http://sheeva.with-linux.com/sheeva – Kernels for the SheevaPlug (and GuruPlug?)