LFS-R13.0 on RPI 4 and 5

Just completed LFS-13.0

Tested on both RPI 5 and RPI 4

Boots to both rpi4 and rpi 5

Disk layout:
partition 1 /boot vfat
partition 2 btrfs with subvolumes System and Home
partition 3 swap

It mounts System subvolume as the / filesystem and mounts Home subvolume 
at /home.

I have started blfs 13.0 and completed the "Post LFS" step

The above was built on a rpi 5 16GB nvme drives
using the following flags:

#CFLAGS='-march=armv8-a+crc -mtune=cortex-a72 -O2 -pipe'
CFLAGS='-mcpu=cortex-a72 -O2  -pipe'
CXXFLAGS="$CFLAGS -Wp,-D_GLIBCXX_ASSERTIONS"
LDFLAGS="-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro 
-Wl,-z,now -Wl,-z,pack-relative-relocs"
MAKEFLAGS="-j$(nproc)"
NINJAJOBS="$(nproc)"
export CFLAGS CXXFLAGS LDFLAGS MAKEFLAGS NINJAJOBS

Minimal changes/ modifications  were needed/necessary.

Scripted build that will be able to use those scripts as is to build the 
next stable version when it comes out.

I can help anyone who wants to build LFS for rpi 3 and above.


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