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Gentoo Installation on AML-S905X-CC (Le Potato)

Requirements

2x microSD cards
USB microSD card adapter
Le Potato board
usb to tty cable so you can see whats going on over UART

Steps

flash raspian image from Libre Computer to both microSD cards Download
insert one of the microSD cards you flashed into the Le Potato and boot (follow initial setup as required)
insert the second microSD into usb adapter and insert adapter into usb slot on Le Potato, this is where you will make changes and install Gentoo
delete root partion (second partition)
create a swap partition if desired
create a new root partition
mkfs.btrfs on the new root partition
mount new partition at /mnt/gentoo (mkdir if needed)
mount the existing EFI partition on /mnt/gentoo/boot/efi (mkdir first)
cp -rp the firmware, kernel modules, kernel headers and the rest of /boot from the raspian microSD you are booted on to the one on the adapter to the same path
use lsmod and put list of modules into /etc/modules-load.d/raspian-modules.conf
at this point you can mostly follow the normal gentoo amd64 handbook for setup (use end0 for ethernet device)

make sure you adjust /etc/inittab if you want to use the uart interface

# Architecture specific features
f0:12345:respawn:/sbin/agetty 115200 ttyAML0 vt100

when you get to bootloader installation/configuration emerge grub with efi-64 (add following to /etc/portage/make.conf)
```
GRUB_PLATFORMS="efi-64"
```
grub-mkconfig -o /boot/grub/grub.cfg
grub-mkstandalone -O arm64-efi -o /boot/efi/EFI/BOOT/BOOTAA64.EFI “boot/grub/grub.cfg=/boot/grub/grub.cfg”

Custom Kernel

Github Source
Branch: v6.0/libretech-master
Start with Config from /boot (from Raspbian image)
make menuconfig/make/make install/make modules_install
emerge dracut
dracut –kver=“6.0.19-419654-g73f2949c2dd9”
grub-mkconfig -o /boot/grub/grub.cfg
grub-mkstandalone -O arm64-efi -o /boot/efi/EFI/BOOT/BOOTAA64.EFI “boot/grub/grub.cfg=/boot/grub/grub.cfg”

Crossdev Env

emerge –ask sys-devel/crossdev
crossdev –stable -t aarch64-unknown-linux-gnu
mkdir -p /var/db/repos/crossdev/{profiles,metadata}
echo 'crossdev' > /var/db/repos/crossdev/profiles/repo_name
chown -R portage:portage /var/db/repos/crossdev

vim /var/db/repos/crossdev/metadata/layout.conf

masters = gentoo
thin-manifests = true</code
  * vim /etc/portage/repos.conf/crossdev.conf<code>
[crossdev]
location = /var/db/repos/crossdev
priority = 10
masters = gentoo
auto-sync = no

crossdev –stable -t aarch64-unknown-linux-gnu

Qemu chroot environment

emerge –ask app-emulation/qemu
QEMU_USER_TARGETS=“aarch64” QEMU_SOFTMMU_TARGETS=“aarch64” USE=“static-user static-libs” emerge –ask –buildpkg –oneshot qemu
cd /usr/aarch64-unknown-linux-gnu
ROOT=$PWD/ emerge –ask –usepkgonly –oneshot –nodeps qemu

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Gentoo Installation on AML-S905X-CC (Le Potato)

Requirements

Steps

Custom Kernel

Crossdev Env

Qemu chroot environment

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