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Acer n35 buildroot
==================
This directory contains patches and config files to get a modern Linux kernel
running on the Acer n35 handheld. Most stuff is based on work by Christer
Weinigel[1] and Jiri Pinkava[2].
Getting started
---------------
buildroot
+++++++++
Go to the directory that contains this README:
cd n35
export REPO_DIR=$(pwd)
Download a copy of buildroot[3] and extract it:
tar -xf buildroot-XXXX.XX.tar.bz2
cd buildroot-XXXX.XX
export BUILDROOT_DIR=$(pwd)
Copy the buildroot and busybox config file:
cp ${REPO_DIR}/buildroot/config-2012.02 ${BUILDROOT_DIR}/.config
cp ${REPO_DIR}/buildroot/busybox-1.19.x.config ${BUILDROOT_DIR}/busybox.config
Symlink the skeleton root fs:
ln -sv ${REPO_DIR}/buildroot/skeleton ${BUILDROOT_DIR}/fs/n35-skeleton
And compile your toolchain:
make
Now you can copy the contents of output/images/rootfs.tar to an SD card or NFS
share.
Kernel
++++++
Download the Linux kernel[4] and extract it
tar -xf linux-X.X.X.tar.bz2
cd linux-X.X.X
Set cross-compiling environment variables
export INSTALL_MOD_PATH=/usr/armv4tl-softfloat-linux-uclibcgnueabi
export ARCH=arm
export CROSS_COMPILE=arm-unknown-linux-uclibcgnueabi-
export PATH=$PATH:$BUILDROOT_DIR/output/host/usr/bin/
Copy linux/X.X.X/config-nfs to .config and compile:
cp ${REPO_DIR}/linux/X.X.X/config-nfs .config
make
Copy the compressed kernel image and Christer’s WinCE boot.exe[5] to a FAT
partition on the SD card
cp arch/arm/boot/zImage /mnt/mmc
cp /path/to/boot.exe /mnt/mmc
Create a file called “default.txt” on the same partition with the following
content:
# Acer N35
set MTYPE 927
set KERNEL "zImage"
set RAMADDR 0x30000000
set CMDLINE "console=tty verbose root=/dev/nfs nfsroot=192.168.131.102:/tmp/export,v3 ip=192.168.131.201:192.168.131.102:192.168.131.102:255.255.255.0:n35:usb0:off nfsrootdebug rw rootdelay=5"
bootlinux
This will start the kernel, set an IP address and boot the system from a NFS
share. Note that you have to set up the network device usb0 correctly on the
host system, otherwise mounting the root partition will result in a kernel
panic.
To boot from the second partition on the SD card use
set CMDLINE "console=tty verbose root=/dev/mmcblk0p2 ro rootdelay=5"
[1] http://zoo.weinigel.se/trac/public/wiki/AcerN30
[2] http://web.vscht.cz/pinkavaj/linux_on_acer_n35.html
[3] http://buildroot.uclibc.org/
[4] http://www.kernel.org/
[5] http://zoo.weinigel.se/n30/downloads/n30-20060107-1454-wince-boot.zip
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