full disk encryption with luks on manjaro xfce

[limxr]

This recipe is for a manjaro xfce pinebook pro image installed to an sdcard.  This recipe may work with other manjaro pinebook pro images.  
First I created a separate partition for /boot that remained unencrypted.  Second, I encrypted the existing root / installation using luks.
I used debian os installed to emmc of pinebook pro, any os that supports luks should work (the default os on pinebook pro does not support luks).  You may want to make sure to have a good backup first in case something goes wrong.

Code:

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separate partitions for boot & root
===================================
boot to debian on emmc
create new partition layout using gparted
(boot will be on 1st partition & root on 2nd partition)
resize mmcblk1p1 partition to smallest size to create free space
(don't touch ~31m unallocated space at start of sdcard)
    copy mmcblk1p1 & paste into remaining free space
  format mmcblk1p1 ext4 to delete files
  resize mmclk1p1 to your desired size, for me ~800mb
    (don't touch ~31m unallocated space at start of sdcard)
  label mmcblk1p1 BOOT
resize/move mmcblk1p2 to fill all remaining free space
move files to /boot
sudo mkdir /mnt/boot; sudo mount /dev/mmcblk1p1 /mnt/boot
    sudo mkdir /mnt/root; sudo mount /dev/mmcblk1p2 /mnt/root
    cd /mnt/boot
    sudo mv /mnt/root/boot/* /mnt/boot
set automount for boot partition
    sudo nano /mnt/root/etc/fstab
        /dev/mmcblk1p1 /boot ext4 defaults 0 2
configure bootloader
    get PARTUUID, for me its 781b2cf9-02
        sudo blkid|grep mmcblk1p2
    add PARTUUID for root and remove /boot/ folder from 3 lines
        cd /mnt/boot/
        sudo nano boot.txt
            #setenv bootargs console=ttyS2,1500000n8 root=PARTUUID=${uuid} rw rootwait bootsplash.bootfile=bootsplash-themes/manjaro/bootsplash append video=eDP-1:1920x1080@60
            setenv bootargs console=ttyS2,1500000n8 root=PARTUUID=781b2cf9-02 rw rootwait bootsplash.bootfile=bootsplash-themes/manjaro/bootsplash append video=eDP-1:1920x1080@60

            #if load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /boot/Image; then
            if load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} Image; then
               #if load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /boot/dtbs/${fdtfile}; then
               if load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} dtbs/${fdtfile}; then

                  #if load ${devtype} ${devnum}:${bootpart} ${ramdisk_addr_r} /boot/initramfs-linux.img; then
                  if load ${devtype} ${devnum}:${bootpart} ${ramdisk_addr_r} initramfs-linux.img; then

    sudo apt install u-boot-tools
    sudo ./mkscr
boot to manjaro on sdcard

============
encrypt root
============
boot to manjaro on sdcard
add modules & hooks to initram
(the order the modules and hooks are loaded is important)
    sudo nano /etc/mkinitcpio.conf
        MODULES=(panfrost rockchipdrm drm_kms_helper hantro_vpu analogix_dp rockchip_rga panel_simple arc_uart cw2015_battery i2c-hid iscsi_boot_sysfs jsm pwm_bl uhid)
        BINARIES=()
        FILES=()
        HOOKS=(base udev keyboard autodetect keymap modconf block encrypt filesystems fsck)
        COMPRESSION="cat"        
    sudo mkinitcpio -P
boot to debian on emmc
encrypt existing partition in place with luks
    make sure mmcblk1p2 is not mounted
    sudo e2fsck -f /dev/mmcblk1p2
    sudo resize2fs -M /dev/mmcblk1p2
    sudo cryptsetup-reencrypt /dev/mmcblk1p2 --new --reduce-device-size 16M
    sudo cryptsetup open /dev/mmcblk1p2 cryptroot
    sudo resize2fs /dev/mapper/cryptroot
    sudo mount /dev/mapper/cryptroot /mnt/root
configure bootloader
    get UUID for mmcblk1p2
    sudo blkid|grep mmcblk1p2
        get UUID root, for me its 6d1c2895-f2c2-477f-8415-b04f7a4641da
    change kernel parameters for encrypted root including display to console & disable splash
        sudo mount /dev/mmcblk1p1 /mnt/boot
        cd /mnt/boot
        sudo nano boot.txt
            # setenv bootargs console=ttyS2,1500000n8 root=PARTUUID=781b2cf9-02 rw rootwait bootsplash.bootfile=bootsplash-themes/manjaro/bootsplash append video=eDP-1:1920x1080@60
            setenv bootargs console=tty1 root=/dev/mapper/cryptroot cryptdevice=UUID=0d739f2d-92af-40ec-bd8b-c8f241e6a2ce:cryptroot:allow-discards rw rootwait quiet append video=eDP-1:1920x1080@60

            #booti ${kernel_addr_r} - ${fdt_addr_r};
            booti ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r};

        sudo ./mkscr
reboot to manjaro on sdcard