The idea

Use only as little space as necessary. This includes no portage nor gcc install on target system (ipaq). The idea is to fully cross-compile the system for ipaq on a i686 host into a subdir (using the ${ROOT} portage feature) and create a jffs2 image which will be uploaded to the ipaq (later updates will be done over nfs-mounted root).

• UPDATE: Now that the handhelds.org 2.6 kernel can boot right from SD, we don't need to bother with creating the jffs2 image.

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The steps

It's best if you write this to a script...

First, we need the tools for cross-compiling...

emerge crossdev

crossdev --target arm-unknown-linux-gnu

If the above fails, try with safer versions...

crossdev -t arm-unknown-linux-gnu --g 3.4.6 --l 2.3.6-r3

If this fails complaining kernel headers are too old, do the following quick hack (see [http://forums.gentoo.org/viewtopic-t-452498.html this forum] for more info...

ln -s /usr/arm-unknown-linux-gnu/usr/include/ /usr/arm-unknown-linux-gnu/include

Prepare the destination directory...

mkdir /tmp/ipaq

Now, we can start building the target system...

export ARCH="arm"
export ACCEPT_KEYWORDS="arm"
export CHOST="arm-unknown-linux-gnu"
export CBUILD="i686-pc-linux-gnu"

export CFLAGS="-O2 -pipe"
export CXXFLAGS=${CFLAGS}

export ROOT="/tmp/ipaq"

export USE="-*"

export FEATURES="-distcc"

export CONFIG_PROTECT="-* ${ROOT}/etc"

### Bootstrap ###
USE="bootstrap build" emerge sysvinit
USE="bootstrap build" emerge baselayout
emerge sys-kernel/linux-headers
USE="bootstrap build" emerge sys-libs/glibc

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Vapier's achievements

• http://dev.gentoo.org/~vapier/CROSS-COMPILE-HOWTO

• http://dev.gentoo.org/~vapier/CROSS-COMPILE-SYSTEM

Other links

• http://gentoo-wiki.com/Embedded_Gentoo

• http://www.yargybot.com/Familiar/MMCFilesystem.html

• http://handhelds.org/moin/moin.cgi/FamiliarBackupHowto