Add documentation for rootfs creation and installation

hansemro commented 3 years ago

It would be nice to have some documentation on building a simple rootfs with busybox. Once more devices become accessible via device tree, I will look into buildroot and postmarketOS.

mj-sakellaropoulos commented 3 years ago

I have buildroot working on Ubuntu 20.10 Download and untar : https://buildroot.org/downloads/buildroot-2021.02.1.tar.gz

# need to install various dependencies, for xconfig you need qt5
cd buildroot
make xconfig

Under Target options, select ARM, cortex-A9, enabled SIMD and VFP, EABIHF, VFPv3
Under toolchain, you can specify a custom toolchain or have it build one from scratch
Under Kernel, you can pass it your defconfig from out of tree
For the devicetree, if it doesn't handle out of tree .dts properly you can manualy put it in output/build/linux-{version}/arch/arm/boot/dts/
Under target packages, you can include the packages you want
Under Filesystem images, you can choose to cpio the rootfs for convenient loading as ramdisk via fastboot

minimal buildroot config : https://gist.github.com/mj-sakellaropoulos/25342160a6d9b66851c9108624850518

hansemro commented 3 years ago

Neat!

hansemro commented 3 years ago

398b51cf2d55a9af4afab3a950fdb6a3b1c4ead3: Added steps to create and install busybox rootfs.

I will look into buildroot next.

hansemro / kc1-linux

Add documentation for rootfs creation and installation #2