How to Build Your Own Bootloader for Libre Computer Boards

Software
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Libre Computer boards feature open source bootloaders that can be built and customized quickly.

git clone https://github.com/libre-computer-project/libretech-builder-simple.git lbs
cd lbs
./setup.sh
./build.sh BOARD #replace BOARD with your model eg. aml-s905x-cc
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Note to self:

Do not build on aarch64, this happens

tools/bmp_logo --gen-info ./board/libre-computer/aml-a311d-cc/aml-a311d-cc.bmp > include/bmp_logo.h
Segmentation fault (core dumped)

Do not build in a docker container (even with –privileged), losetup and partprobe has issues with dynamic device files.

It works when building on AMD64 in KVM

curl -O u-boot.qcow2 https://cloud.debian.org/images/cloud/bookworm/latest/debian-12-nocloud-amd64.qcow2
qemu-img resize uboot.qcow2 8G
qemu-system-x86_64 -enable-kvm uboot.qcow2 -nographic -machine q35 -m 4096
# log in as "root"
apt update
apt install -y parted
# TODO add steps to resize the root partition
apt install -y git sudo
cd
git clone https://github.com/libre-computer-project/libretech-builder-simple.git lbs
cd lbs
./setup.sh
apt install -y fdisk dosfstools wget
# look in ./configs for board to build
./build.sh aml-a311d-cc-spi
# burn the out/aml-a311d-cc-spiflash to a flash drive, and then boot the flash drive on the SBC to update the bootloader on the SPI.
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We will be moving to genimage for LBS soon which should resolve the losetup dependency.