User:Minou/Arm64/Beaglebone-AI64

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Left to do = Test the SD image 

I still have issue with the display, apparently I am not the only one.
I need to figure out how to get the HDMI display to be recognized.

Build u-boot

Here it is assumed that the directory travail already exists
We create a beaglebone-AI-64 directory
The following is based on the script build_u-boot.sh from Robert Nelson
user $cd $HOME/travail/arm64
user $mkdir beaglebone-AI-64
user $cd beaglebone-AI-64
user $chmod a+x build_u-boot.sh
FILE build_u-boot.sh
change CC64=aarch64-linux-gnu- to CC64=aarch64-unknown-linux-gnu-
   In the line to compile trusted-firmware-a add ENABLE_PIE=0 
   It will fail compiling on gentoo unless that is done
   make -C ./trusted-firmware-a/ -j4 CROSS_COMPILE=$CC64 CFLAGS= LDFLAGS= ARCH=aarch64 PLAT=k3 SPD=opteed $TFA_EXTRA_ARGS TARGET_BOARD=${TFA_BOARD} ENABLE_PIE=0 all
user $./build_u-boot.sh
The generated files can be found on the public directory

bl31.bin
sysfw.itb
tee-pager_v2.bin  
tiboot3.bin
tispl.bin
u-boot.img

Linux Kernel

We will cross compile the kernel
It takes too long in chroot and we need a kernel to boot the image
We should be able to recompile later once we have a working image
user $cd $HOME/travail/arm64
user $mkdir kernel
user $cd kernel
user $mkdir deploy
user $mkdir deploy/tmp
user $mv Linux-Files/getKernel.sh ./
user $./getKernel.sh 
Compile kernel
user $export CC=aarch64-unknown-linux-gnu-
user $cd linux-6.12-ti-arm64-r13
user $make ARCH=arm64 CROSS_COMPILE=${CC} distclean
user $make ARCH=arm64 CROSS_COMPILE=${CC} bb.org_defconfig
If you want to modify the default .config use menuconfig
You may want to adjust the number of cores to use
If you use too many cores you won't be able to do anything else
user $make -j8 ARCH=arm64 CROSS_COMPILE=${CC} menuconfig
user $make -j8 ARCH=arm64 CROSS_COMPILE=${CC} Image modules
user $make -j8 ARCH=arm64 CROSS_COMPILE=${CC} dtbs
We need to install the newly compiled kernel
user $make ARCH=arm64 CROSS_COMPILE=aarch64-unknown-linux-gnu- modules_install INSTALL_MOD_PATH=../deploy/tmp
user $make ARCH=arm64 CROSS_COMPILE=aarch64-unknown-linux-gnu- dtbs_install INSTALL_DTBS_PATH=../deploy/tmp
user $cp arch/arm64/boot/Image ../deploy

Create gentoo rootfs

We will be using an already created rootfs

root #cd /usr/src/arm64
root #mkdir rootfs-beaglebone-AI-64
root #cd rootfs-beaglebone-AI-64
root #tar xvf ../rootfs-arm64-20250129.tar.gz --strip-components 1

chroot in rootfs directory

root #arch-chroot /usr/src/arm64/rootfs-beaglebone-AI-64
root #env-update
root #export PS1="(chroot) $PS1"
root #source /etc/profile
root #emerge --sync

update system

Don't forget to Create a root password

Just in case the original rootfs is a few days or weeks old
it would be a good idea to do a system update

 If glibc or ncurses are reemerged this could take a while
root #emerge -avuDN @world
root #exit

Create Image

With fdisk create a 128MB partition for the boot partition
and an ext4 partition for the rootfs
su to root (not "su -" so it won't change the directory)
user $su
root #fdisk /dev/sdd 
Bienvenue dans fdisk (util-linux 2.40.2).

Les modifications resteront en mémoire jusqu'à écriture.
Soyez prudent avant d'utiliser la commande d'écriture.

Commande (m pour l'aide) : p
Disque /dev/sdd : 59,48 GiB, 63864569856 octets, 124735488 secteurs
Modèle de disque : Mass-Storage    
Unités : secteur de 1 × 512 = 512 octets
Taille de secteur (logique / physique) : 512 octets / 512 octets
taille d'E/S (minimale / optimale) : 512 octets / 512 octets
Type d'étiquette de disque : dos
Identifiant de disque : 0xc1078c06

Périphérique Amorçage  Début       Fin  Secteurs Taille Id Type
/dev/sdd1    *          2048    264191    262144   128M  c W95 FAT32 (LBA)
/dev/sdd2             264192 124735487 124471296  59,4G 83 Linux
root #mkfs.vfat -F 16 /dev/sdd1 -n FIRMWARE
root #mkfs.ext4 /dev/sdd2 -L rootfs
root #exit 
Create empty directories for boot and rootfs
and mount the partitions
root #cd $HOME/travail/arm64/beaglebone-AI-64/
root #mkdir boot
root #mkdir rootfs
root #sudo mount /dev/sdd1 boot
root #sudo mount /dev/sdd2 rootfs
root #cd public
root #cp sysfw.itb ../boot
root #cp tiboot3.bin ../boot
root #cp tispl.bin ../boot
root #cp u-boot.img ../boot
root #cp sysfw.itb ../boot
root #cp tee-pager_v2.bin boot
root #cp ../kernel/deploy/Image boot
root #cp -Rp /usr/src/arm64/rootfs-beaglebone-AI-64 rootfs
root #sync
root #cp ../kernel/deploy/Image boot
root #cp -Rp ../kernel/deploy/tmp/ti rootfs
root #cp -Rp ../kernel/deploy/tmp/lib/modules rootfs/lib
root #exit
Create extlinux.conf in boot partition, this is what tell u-boot what to load…
FILE boot/extlinux/extlinux.conf
label Linux microSD
    kernel /Image
    append console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000 root=/dev/mmcblk1p2  ro rootfstype=ext4 rootwait net.ifnames=0
    fdtdir /
user $sudo umount rootfs
user $sudo umount boot

Just Starting

Linux Kernel

We will cross compile the kernel
It takes too long in chroot and we need a kernel to boot the image
We should be able to recompile later once we have a working image
We get the latest stable kernel
user $cd $HOME/travail/arm64
user $mkdir rpi5
user $cd rpi5
user $tar xvf stable_20250127.tar.gz linux-20250127
user $mkdir boot
user $mkdir boot/overlays 
Compile kernel
user $export CC=aarch64-unknown-linux-gnu-
user $cd linux-20250127
user $export KERNEL=kernel_2712
user $make ARCH=arm64 CROSS_COMPILE=${CC} distclean
user $make ARCH=arm64 CROSS_COMPILE=${CC} bcm2712_defconfig
If you want to modify the default .config use menuconfig
You may want to adjust the number of cores to use
If you use too many cores you won't be able to do anything else
user $make -j8 ARCH=arm64 CROSS_COMPILE=${CC} menuconfig
user $make -j8 ARCH=arm64 CROSS_COMPILE=${CC} Image modules
user $make -j8 ARCH=arm64 CROSS_COMPILE=${CC} dtbs
If it compiles correctly we copy the files on the deploy directory
user $cp arch/arm64/boot/Image ../boot/$KERNEL.img
user $cp arch/arm64/boot/dts/broadcom/*.dtb ../boot/
user $cp arch/arm64/boot/dts/overlays/*.dtb* ../boot/overlays/
user $cp arch/arm64/boot/dts/overlays/README ../boot/overlays/
user $cp arch/arm64/boot/dts/broadcom/*.dtb ../boot/
user $cp arch/arm64/boot/dts/overlays/*.dtb* ../boot/overlays/
user $cp arch/arm64/boot/dts/overlays/README ../boot/overlays/
If the rootfs is not already created do this
root #cd /usr/src/arm64
root #mkdir rootfs-rpi5
root #cd rootfs-rpi5
root #tar xvf ../rootfs-arm64-20250129.tar.gz --strip-components 1
We need to install the kernel modules
user $sudo make ARCH=arm64 CROSS_COMPILE=aarch64-unknown-linux-gnu- modules_install INSTALL_MOD_PATH=/usr/src/arm64/rootfs-rpi5
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