User:Jens3/Installing Gentoo on a Raspberry Pi 400

Installing Gentoo on a Raspberry Pi 400
This are my notes about installing Gentoo on a Raspberry Pi 400. The 1.-3. try weren't successful, the 4. works and is still in use. The fifth installation is on a 4B, 4GB Ram.

The 4B and the 400 have nearly the same hardware with slight differences in some firmware files. The 4B needs brcmfmac43455*, the Pi 400 needs brcmfmac43456*.

5. (First try on a Pi 4B, 4GB RAM)
As base I use https://cmpct.info/~sam/gentoo/arm64/PiGentoo64.html and my try.

4.
After running in https://bugs.gentoo.org/727188 I started using -O2 instead of -Os.


 * VIDEO_CARDS="v3d vc4" is needed
 * https://cmpct.info/~sam/gentoo/arm64/PiGentoo64.html
 * mkfs.ext4 /dev/sda2


 * mount /dev/sda2 /mnt/gentoo/
 * wget,
 * make.conf: I prefer COMMON_FLAGS="-Os -pipe -march=native" and MAKEOPTS="-j3", since my Raspi400 has just 4GB Ram. For big packages I may have to add -j1 on a per-package base.
 * 10. and 11. are the same
 * 12.1 is the same. Instead of 12.2:
 * echo sys-kernel/raspberrypi-sources ~arm64 >> /etc/portage/package.accept_keywords ; emerge -va raspberrypi-sources
 * ln -s /usr/src/linux-5.10.11_p20210201-raspberrypi/ /usr/src/linux


 * 12.3 same
 * make menuconfig # I changed:
 * Compiler optimization level to -Os
 * Default CPUfreq governor to ondemand
 * added some crypto algos as modules that are (maybe) supported by the cpu


 * 12.4 same
 * 12.5 time nice ionice -c3 make -j4 Image modules dtbs
 * real    75m18.147s
 * user    261m19.520s
 * sys     32m35.646s
 * 12.6 mount /boot inside chroot
 * 12.7 the same
 * 12.8. a) same b) make install
 * added ACCEPT_LICENSE="* -@EULA" to make.conf
 * 13, 14 same
 * some steps are missing here
 * I had problems with modprobe giving me an "exec format error". I am using the kernel from the package raspberrypi-sources and used make install modules_install dtbs_install . The kernel resides then in /boot/vmlinuz-5.* . After copying vmlinuz-5.x to kernel-8-p4.img it worked.
 * emerge rpi-eeprom
 * perl-cleaner --all # after reinstalling perl
 * After booting into gentoo without having X up and runnig I like to use dvtm. To get the time into the status line I copy the script from /usr/share/doc/dvtm-*/README.md.bz2 subheader ### Statusbar to a shell script and start dvtm with this script. Screenshots are available at https://screenshots.debian.net/package/dvtm

Third try

 * https://cmpct.info/~sam/gentoo/arm64/PiGentoo64.html
 * formatting the gentoo root partition with mkfs.btrfs gives me "SSD detected: no" which leads to "Metadata: DUP;System: DUP"
 * from man mkfs.btrfs (8): "The detection is based on the value of /sys/block/DEV/queue/rotational". rotational was 1, therefore I zeroed it: echo 0>rotational.
 * mkfs.btrfs -fL gentooroot /dev/sdaX
 * for f2fs there is no label command, but you can enter the label at the mkfs command, too
 * mount -o nodatacow,noatime,lazytime /dev/sdaX /mnt/gentoo # nodatacow disables the feature copy on write. Small changes get faster and I hope there will be fewer data written to the SSD
 * cd /mnt/gentoo;wget "stage3"
 * make.conf: I prefer COMMON_FLAGS="...-Os..." and MAKEOPTS="-j3", since my Raspi400 has just 4GB Ram. For big packages I may have to add -j1 on a per-package base.
 * make.conf: I prefer COMMON_FLAGS="...-Os..." and MAKEOPTS="-j3", since my Raspi400 has just 4GB Ram. For big packages I may have to add -j1 on a per-package base.


 * 10. and 11. are the same
 * The PiGentoo64.html links to an old stage3.
 * 12.1 is the same. Instead of 12.2:
 * echo sys-kernel/raspberrypi-sources ~arm64 >> /etc/portage/package.accept_keywords ; emerge -va raspberrypi-sources
 * ln -s /usr/src/linux-5.10.11_p20210201-raspberrypi/ /usr/src/linux
 * 12.3. same.
 * make menuconfig # I changed:
 * Compiler optimization level to -Os
 * Default CPUfreq governor to ondemand
 * added some crypto algos as modules that are (maybe) supported by the cpu
 * btrfs should be included, if it is used as root
 * 12.4 same
 * 12.5.: time nice ionice -c3 make -j3 Image modules dtbs
 * real    85m43.988s
 * user    233m17.883s
 * sys     30m17.258s
 * 12.6 mount /boot inside chroot
 * 12.7 the same
 * 12.8. a) same b) make install
 * added ACCEPT_LICENSE="* -@EULA" to make.conf

Second try

 * Downloaded [gentoo-on-rpi-64bit 1.6.0 full]( https://github.com/sakaki-/gentoo-on-rpi-64bit/releases/download/v1.6.0/genpi64.img.xz ) [asc](https://github.com/sakaki-/gentoo-on-rpi-64bit/releases/download/v1.6.0/genpi64.img.xz.asc)
 * 1) xzcat genpi64.img.xz > /dev/sdX && sync

The Rpi 400 doesn't boot the image but shuts down immediately. I copied bcm2711-rpi-400.dtb to the boot dir, but it didn't change anything. I copied from a /boot First try below /boot/start* /boot/fixup* to the /boot and gentoo started, but got stuck at "switching off virutalization kvm". After rebooting the system started.

I copied the dir /lib/firmware/brcm and rebooted.

emerge --sync ; emerge -uvaDN @world gives several problems.

I tried to upgrade the packages one by one, until I realized, with help from #gentoo-arm, that the /etc/portage/repos.conf/gentoo.conf uses isshoni.org as source, which doesn't get any updates any more.

I tried again to upgrade one by one but realized how many programs are installed, how many couldn't be upgraded one by one and thought, it would not be a clean system after all. I gave up.

Gentoo doesn't seem to get my stable desktop system now, but it is still a nice distro for fun. I guess, I go back to run gentoo in a virtual machine and get more knowledge.

First try
Somewhere at installing X I got stuck and this will not be finished!


 * Hardware: Raspberry Pi 400 with a 64GB microSD card with A1 standard
 * From Handbook:Main_Page "Note: The arm and arm64 architectures are supported by the Gentoo project but do not yet have Handbooks at their disposal. Please refer to the ARM project and |bug #534376 for more information.
 * since there is no handbook for installing Gentoo on Arm 64, I took the AMD64 handbook
 * base system: Raspberry Pi OS 64bit beta works so far (WiP), optional mirrorselect is missing; gentoo root is in a 20 GB loopback mounted file
 * make.conf: COMMON_FLAGS="-Os -pipe -mcpu=native"
 * profile-config set 2 (default/linux/arm64/17.0/desktop (stable)) brings a loop dependency with harfbuzz. The loop dependecy is documented in use.local.desc: "media-libs/freetype:harfbuzz - Use media-libs/harfbuzz for auto-hinting OpenType fonts. WARNING: may trigger circular dependencies!". I then used profile 1.
 * /etc/portage/make.conf: MAKEOPTS="-j1" because otherwise compiling gcc leaves the computer unuseable for two hours
 * gcc didn't get compiled, error was: "{standard input}: Assembler messages: \n {standard input}:2669550: Warning: end of file not at end of a line; newline inserted \n xg++: fatal error: Killed signal terminated program cc1plus" in the irc I got the information, that is was an OOM
 * Retrying with 16G of swap and stopping firefox and thunderbird. Raspberry Pi OS has just a 100MB swap file as default. Compiling worked.
 * echo sys-kernel/raspberrypi-sources ~arm64 >> /etc/portage/packages.accept_keywords ; emerge -va raspberrypi-sources
 * emerge -va raspberrypi-firmware raspberrypi-image
 * Raspberry Pi4 64 Bit Install
 * https://packages.gentoo.org/packages/sys-kernel/raspberrypi-sources
 * Raspberry Pi 3 64 bit Install
 * emerge -va rpi-eeprom
 * cd /usr/src/linux; make bcm2711_defconfig
 * make menuconfig # I changed:
 * Compiler optimization level to -Os
 * Default CPUfreq governor to ondemand
 * added some crypto algos as modules that are (maybe) supported by the cpu
 * make all
 * added CPU_FLAGS_ARM="edsp neon thumb vfp vfpv3 vfpv4 vfp-d32 crc32 v4 v5 v6 v7 v8 thumb2" to /etc/portage/make.conf . They were reported by cpuid2cpuflags, seeCPU FLAGS X86 for details.
 * emerge -va wpa_supplicant # broadcom-sta is the "wl" driver for (older?) broadcom chips.
 * Partitioning the 1TB SSD (Raspberry Pi 3 64 bit Install)
 * Partition size id Type mount
 * sda1 256M c W95 FAT32 (LBA) /boot
 * sda2 other 5 extended -
 * sda5 8G 82 swap swap
 * sda6 100G 83 Linux /
 * sda7 823G 83 Linux /data

/boot/cmdline.txt
This file will not exist until its created. Create it with the following content.
 * emerge xorg-x11

qemu

 * As of qemu 6.1.50 (checked on 2021-09-06) Rpi 4b and 400 are not supported as targets. see https://qemu-project.gitlab.io/qemu/system/arm/raspi.html for details
 * "Qemu 2.0 includes arm64 support, and Debian 8 (and above) fully supports it." https://wiki.debian.org/Arm64Qemu . I hope, it works in RaspberryPi OS

Links

 * Raspberry Pi/Quick Install Guide
 * Raspberry_Pi_VC4
 * https://github.com/sakaki-/gentoo-on-rpi-64bit
 * User:Maffblaster/Projects/GenPi64
 * https://cmpct.info/~sam/gentoo/arm64/PiGentoo64.html
 * https://www.raspberrypi.org/documentation/computers/linux_kernel.html#cross-compiling-the-kernel At the end of the section is a list of files to copy