Funtoo Linux Installation on RPI

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Introduction

This is an extension and amplification of Funtoo_Linux_Installation_on_ARM. It attempts to systematize and automate as much as possible of steps required to get Funtoo running on the 32 bit ARM Raspberry Pi device.

This is an update of Crossdev_Automation, reflecting the changes needed to accomodate the new kits structure of Funtoo, and to clean up the scripting used for automation. The document will remain available for reference purposes.


Installation Overview

  1. #Create Your Installation Settings
  2. #Install the Stage 3 Tarball
  3. #Install the Firmware
  4. #Configure Your System
  5. #Install Binary Kernel, Modules and dtbs
  6. #Cross-compile Kernel, Modules and dtbs from Source
  7. #Optionally Install Distcc via QEMU Chroot
  8. #Partition and Format an SDCard
  9. #Deploy Installation to SDCard
  10. #Transfer the SDCard to the Raspberry Pi and Reboot
  11. #Enjoy!

Get the Bash Script

Development code is available on github. The structure of the file sysroot.sh should roughly correspond to the information contained here.

Too use the script, edit the config file and then

root # source sysroot.sh && sysroot_install


Create Your Installation Settings

Confguration your installation. These variables are referencecd by the sysroot.sh script and by this document.

   config (bash source code) - Set your install configuration variables
KERNEL_WORK=/usr/src/rpi_kernel
RPI_KERN_BRANCH=rpi-4.14.y

SYSROOT_WORK=/usr/src/sysroots
STAGE_URL=http://ftp.osuosl.org/pub/funtoo/funtoo-current/arm-32bit/raspi3/stage3-latest.tar.xz
CHOST=armv7a-hardfloat-linux-gnueabi
CFLAGS="-O2 -pipe -march=armv7-a -mtune=cortex-a53 -mfpu=neon-vfpv4 -mfloat-abi=hard"

#SDCARD_DEV=mmcblk0p
SDCARD_DEV=sdb

#optional
DISTCC_REMOTE_JOBS=21
DISTCC_REMOTE_HOSTS="10.0.0.1,cpp,lzo"


Install the Stage 3 Tarball

Download the current Funtoo stage 3 build appropriate for your Raspberry Pi device. Check the Subarches#arm32 page, to see the version available for versions 1,2 and 3 of the Pi. Here we download the version for version 3 by setting the STAGE_URL variable in our configuration file.

We need to save the archive to $STAGE3_ARCHIVE and unpack it to $SYSROOT. Back up or remove any previous work in that local.

root # export SYSROOT=$SYSROOT_WORK/$CHOST
root # export STAGE3_ARCHIVE=/tmp/stage3-latest.tar.xz
root # mv -n $SYSROOT $SYSROOT.old
root # mkdir -p $SYSROOT
root # wget ${STAGE_URL} -O ${STAGE3_ARCHIVE}
root # tar xpfv ${STAGE3_ARCHIVE} -C ${SYSROOT}

Install the Firmware

Make your work directory and clone the official firmware repo into it. Copy the appropriate boot firmware files to the sysroot, along with the video acceleration binaries. If you want to use the wireless networking function, you need the bcrm firmware as well.

root # mkdir -p ${KERNEL_WORK}
root # git clone --depth 1 git://github.com/raspberrypi/firmware/ ${KERNEL_WORK}/firmware
root # cp ${KERNEL_WORK}/firmware/boot/{bootcode.bin,fixup*.dat,start*.elf} ${SYSROOT}/boot
root # cp -r ${KERNEL_WORK}/firmware/hardfp/opt ${SYSROOT}
root # git clone --depth 1 https://github.com/RPi-Distro/firmware-nonfree ${KERNEL_WORK}/firmware-nonfree
root # git --git-dir=${KERNEL_WORK}/firmware-nonfree/.git --work-tree=${KERNEL_WORK}/firmware-nonfree pull origin
root # mkdir -p ${SYSROOT}/lib/firmware/brcm
root # cp -r ${KERNEL_WORK}/firmware-nonfree/brcm/brcmfmac43430-sdio.{bin,txt} ${SYSROOT}/lib/firmware/brcm

Configure Your System

Here, we attempt to encapsulate the instructions from Funtoo_Linux_Installation_on_ARM. There are two ways to do this. Here we alter files and symlinks in $SYSROOT/etc directly. We could also chroot into $SYSROOT using QEMU as described below to install sys-devel/distcc, use rc-update directly. However the method used here doesn't depend upon a functioning QEMU chroot, which can be slow and tricky to implement for beginners.

Set Up Mount Points

Alter $SYSROOT/etc/fstab as follows. We remove the swap (for now), and alter the storage device name and parition file types. We also remove the /dev/cdrom device.

   $SYSROOT/etc/fstab
/dev/mmcblk0p1  /boot   vfat    noauto,noatime  1 2
/dev/mmcblk0p2  /   ext4    noatime 0 1

We can use the following sys-apps/sed code.

root # sed -i "s/\/dev\/sda1.*/\/dev\/mmcblk0p1 \/boot vfat defaults 0 2/" ${SYSROOT}/etc/fstab
root # sed -i "s/\/dev\/sda2.*//" ${SYSROOT}/etc/fstab
root # sed -i "s/\/dev\/sda3.*/\/dev\/mmcblk0p2 \/ ext4  defaults 0 1/" ${SYSROOT}/etc/fstab
root # sed -i "s/\#\/dev\/cdrom.*//" ${SYSROOT}/etc/fstab

Set Up Root Password

root # sed -i "s/root\:\*/root\:`(openssl passwd -1)`/" $SYSROOT/etc/shadow

Set Up Networking

root # ln -sf /etc/init.d/dhcpcd ${SYSROOT}/etc/runlevels/default

Set Up SSH Access

root # echo "PermitRootLogin yes" >> ${SYSROOT}/etc/ssh/sshd_config
root # ln -sf /etc/init.d/sshd ${SYSROOT}/etc/runlevels/default

Set Up the Software Clock

root # ln -sf /etc/init.d/swclock ${SYSROOT}/etc/runlevels/boot
root # rm ${SYSROOT}/etc/runlevels/boot/hwclock
root # mkdir -p ${SYSROOT}/lib/rc/cache
root # touch ${SYSROOT}/lib/rc/cache/shutdowntime

Disable Serial Console Access

If you want this, set it up yourself.

root # sed -i "s/s0\:.*/\#&/" ${SYSROOT}/etc/inittab

Link to Accelerated Video Libraries

root # echo "LDPATH=\"/opt/vc/lib\"" > ${SYSROOT}/etc/env.d/99vc

Configure the Boot Parameters

root # cat > ${SYSROOT}/boot/cmdline.txt << EOF
root ##i## dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
root ##i## EOF

Install Binary Kernel, Modules and dtbs

root # mkdir -p ${SYSROOT}/boot/overlays
root # cp ${KERNEL_WORK}/firmware/boot/dts/*.dtb ${SYSROOT}/boot/
root # cp ${KERNEL_WORK}/firmware/boot/dts/overlays/*.dtb* ${SYSROOT}/boot/overlays/
root # cp ${KERNEL_WORK}/firmware/boot/dts/overlays/README ${SYSROOT}/boot/overlays/
root # cp ${KERNEL_WORK}/firmware/boot/kernel7.img  ${SYSROOT}/boot/

Cross-compile Kernel, Modules and dtbs from Source

Install Crossdev

sys-devel/crossdev is a wonderful script for managing cross-compiling environments on Gentoo, but it is incompatible with Funtoo's improved gcc ebuilds. There is incomplete documentation of a pure Funtoo solution, but there has been no follow up on a complete implementation.

A simple solution is to create a local overlay named "crossdev", store gentoo ebuilds and patches in it, and use a crossdev command line switch to direct it to search the overlay for the appropriate ebuilds. This has the advantage of isolating all gentoo files and resulting binaries in a single directory.~

   Note

Please ensure that /etc/portage{package.keywords,package.mask,package.use} are all directories.

Make a Local Overlay

Let's follow the directions from Local_Overlay, and remove the .git subdirectory.~

root # mkdir /var/git/overlay
root # cd /var/git/overlay
root # git clone  https://github.com/funtoo/skeleton-overlay.git crossdev
root # rm -rf /var/git/overlay/crossdev/.git
root # echo "crossdev" > /var/git/overlay/crossdev/profiles/repo_name

Edit config files to match.

   /etc/portage/repos.conf/crossdev.conf - Add the crossdev overlay to portage
[crossdev]
location = /var/git/overlay/crossdev
auto-sync = no
priority = 10

Sparse Checkout Gentoo GCC Ebuilds

Let's make a sparse checkout of the main Gentoo repo.

root # cd /var/git/overlay/crossdev
root # git init
root # git remote add origin git://github.com/gentoo/gentoo.git
root # git config core.sparseCheckout true
root # echo "sys-devel/gcc" >> .git/info/sparse-checkout
root # git pull --depth=1 origin master

Unmask and Emerge Crossdev

root # echo "sys-devel/crossdev **" >> /etc/portage/package.keywords/crossdev
root # echo "=sys-devel/crossdev-99999999" >> /etc/portage/package.unmask/crossdev
root # emerge crossdev

Install Cross Compilation Tool Chain

root # crossdev -S --ov-gcc /var/git/overlay/crossdev -t ${CHOST}

Retrive Raspberry Pi Kernel Sources

root # git clone https://github.com/raspberrypi/linux.git ${KERNEL_WORK}/linux

Clean and Update Kernel Sources

root # git --git-dir=${KERNEL_WORK}/linux/.git --work-tree=${KERNEL_WORK}/linux clean -fdx
root # git --git-dir=${KERNEL_WORK}/linux/.git --work-tree=${KERNEL_WORK}/linux checkout master
root # git --git-dir=${KERNEL_WORK}/linux/.git --work-tree=${KERNEL_WORK}/linux fetch --all
root # git --git-dir=${KERNEL_WORK}/linux/.git --work-tree=${KERNEL_WORK}/linux branch -D ${RPI_KERN_BRANCH}
root # git --git-dir=${KERNEL_WORK}/linux/.git --work-tree=${KERNEL_WORK}/linux checkout ${RPI_KERN_BRANCH}

Make the Default Config

The next set of make commands take place in the kernel source directory.

root # cd ${KERNEL_WORK}/linux

There are many useful make targets to control kernel configs. In particular, the architecture specific ones are most useful in cross-compiling applications. You can see all available architecture specfic default configurations with the following command.

root # make -j$(nproc) \
root ##i## ARCH=arm \
root ##i## CROSS_COMPILE=${CHOST}- \
root ##i## make_defconfig_help 
root # Architecture specific targets (arm):
... <targets we don't need> ...

acs5k_defconfig          - Build for acs5k
acs5k_tiny_defconfig     - Build for acs5k_tiny
am200epdkit_defconfig    - Build for am200epdkit
assabet_defconfig        - Build for assabet
at91_dt_defconfig        - Build for at91_dt
axm55xx_defconfig        - Build for axm55xx
badge4_defconfig         - Build for badge4
root ##r##bcm2709_defconfig        - Build for bcm2709
bcm2835_defconfig        - Build for bcm2835
bcm_defconfig            - Build for bcm
bcmrpi_defconfig         - Build for bcmrpi
cerfcube_defconfig       - Build for cerfcube
clps711x_defconfig       - Build for clps711x
...<lots o configs>...
zeus_defconfig           - Build for zeus
zx_defconfig             - Build for zx

...<more targets we don't need> ...
root # make -j$(nproc) \
root ##i## ARCH=arm \
root ##i## CROSS_COMPILE=${CHOST}- \
root ##i## bcm2709_defconfig

Configure the Kernel

root # make -j$(nproc) \
root ##i## ARCH=arm \
root ##i## CROSS_COMPILE=${CHOST}- \
root ##i## MENUCONFIG_COLOR=mono \
root ##i## menuconfig

Build and Install the Kernel

root # make -j$(nproc) \
root ##i## ARCH=arm \
root ##i## CROSS_COMPILE=${CHOST}- \
root ##i## zImage dtbs modules
root # make -j$(nproc) \
root ##i## ARCH=arm \
root ##i## CROSS_COMPILE=${CHOST}- \
root ##i## INSTALL_MOD_PATH=${SYSROOT} \
root ##i## modules_install
root # mkdir -p ${SYSROOT}/boot/overlays
root ##i## cp arch/arm/boot/dts/*.dtb ${SYSROOT}/boot/
root ##i## cp arch/arm/boot/dts/overlays/*.dtb* ${SYSROOT}/boot/overlays/
root ##i## cp arch/arm/boot/dts/overlays/README ${SYSROOT}/boot/overlays/
root # scripts/mkknlimg arch/arm/boot/zImage ${SYSROOT}/boot/kernel7.img

Remove Kernel Headers and Source Links

root # rm ${SYSROOT}/lib/modules/`get_kernel_release`/{build,source}

Backup Kernel Config

root # mkdir -p ${SYSROOT}/etc/kernels
root # cp -i ${KERNEL_WORK}/linux/.config ${SYSROOT}/etc/kernels

Partition and Format an SDCard

root # export SDCARD=/dev/SDCARD_DEV

Randomize SDCard

root # dd if=/dev/urandom of=${SDCARD} bs=1M status=progress

Write Parition Scheme to SDCard

root # umount -Rl ${SDCARD}
root # sfdisk --no-reread --wipe always ${SDCARD} << EOF
root ##i## label: dos
root ##i## unit: sectors
root ##i## ${SDCARD}1 : start=        2048, size=     1048576, type=c
root ##i## ${SDCARD}2 : start=     1050624, type=83
root ##i## EOF

Format SDCard

Make sure you have sys-fs/dosfstools installed.

root # mkfs.ext4 ${SDCARD}2
root # mkfs.vfat ${SDCARD}1

Deploy Installation to SDCard

root # mkdir -p /mnt/funtoo
root # mount ${SDCARD}2 /mnt/funtoo
root # mkdir -p /mnt/funtoo/boot
root # mount ${SDCARD}1 /mnt/funtoo/boot
root # rsync --archive \
root ##i##      --verbose \
root ##i##      --progress \
root ##i##      --exclude "var/git/*" \
root ##i##    ${SYSROOT}/{boot,bin,etc,home,lib,mnt,opt,root,run,sbin,srv,tmp,usr,var,dev} \
root ##i##    /mnt/funtoo/
root # umount /mnt/rpi/boot
root # umount /mnt/rpi

Transfer the SDCard to the Raspberry Pi and Reboot

Enjoy!