PinePhone Pro/Create a multi-distribution image using rk2aw

This article explains how to create a multi-distribution image on the PinePhone Pro using rk2aw.

Multi-Distro on MicroSD Card

This section explains how to install megi's rk2aw loader, U-Boot to SPI and a multi-distribution image to the microSD card and eMMC of the PinePhone Pro. Further instructions regarding rk2aw can be found on megi's website under https://xff.cz/kernels/rk2aw/rk2aw-rk3399-pinephone-pro/INSTALL. Please note that loader and userspace utility to flash it are free, but not open-source.

Options to boot Arch Linux ARM, Manjaro and Mobian (kernel 6.1 and 6.3)

Flash Rk2Aw Loader to SPI

Connect PinePhone Pro to a Linux machine, start a ssh connection and download installer to flash pre-loader to the phone's SPI.

ssh <user>@<phoneip>
cd ~/Downloads
curl -O https://xff.cz/kernels/bootloaders/ppp.tar.gz
tar -xvzf ppp.tar.gz -C ~/Downloads
# scp -r ~/Downloads/ppp <user>@<phoneip>:~/Downloads # copy to phone, non needed
sudo ./spinor-flash-initial-setup.sh

Build Multi-Distro on SD Card

Get the compressed distribution images from PinePhone Pro Software Releases, decompress them and mount both partitions "/boot", "/root" from each distro.

lsblk # show /loop, /sd references
 ├─loop0p1	/media/xxx/BOOT_MNJRO
 └─loop0p2	/media/xxx/ROOT_MNJRO
 ├─loop1p1	/media/xxx/boot
 └─loop1p2	/media/xxx/rootfs
 ├─loop2p1 /media/xxx/52CA-6165  
 └─loop2p2	/media/xxx/3d99072c-9fd6-4316-8526-9192e192c441
 └─sdb	disk (after each dd command you'll see the partition id name to adjust into scripts.)
blkid # show UUID for the partition

If necessary erase SD card

sudo dd if=/dev/zero of=/dev/sdb count=945728 bs=32768 status=progress # quick way i.e. # 32GB SDcard (30989615104bytes/32768dim=945728volte)
sudo dd if=/dev/zero of=/dev/sdb count=1 bs=32768 status=progress # slow way i.e. # 32GB SDcard (30989615104bytes/32768dim=1volta)

Partition the MicroSD Card

Note: A minimum capacity of 64 GB for the microSD card is recommended for 5 distros.

sudo sfdisk /dev/sdb --wipe always <<EOF
 label: gpt
 first-lba: 64
 table-length: 8
 start=64, size=32704, type=D7B1F817-AA75-2F4F-830D-84818A145370, name="loader", attrs=RequiredPartition
 size=11G, name="ALARM", attrs="RequiredPartition,LegacyBIOSBootable"
 size=11G, name="MANJARO", attrs="RequiredPartition,LegacyBIOSBootable"
 size=11G, name="MOBIAN", attrs="RequiredPartition,LegacyBIOSBootable"
 size=11G, name="PMOS", attrs="RequiredPartition,LegacyBIOSBootable"
 size=11G, name="UT", attrs="RequiredPartition,LegacyBIOSBootable"
 size=+, name="extra", attrs="RequiredPartition,LegacyBIOSBootable"
EOF

Checking that no-one is using this disk right now ... OK
Disk /dev/sdb: 58.25 GiB, 62550179840 bytes, 122168320 sectors
Disk model: SD Card Reader  
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: C44BE2FC-34D6-4DD8-99FC-7FFB75602A79
Old situation:
>>> Script header accepted.
>>> Created a new GPT disklabel (GUID: F71BFBA6-D2C3-4C20-8079-1401B10C724C).
The maximal number of partitions is 8 (default is 128).
 /dev/sdb1: Created a new partition 1 of type 'unknown' and of size 16 MiB.
 /dev/sdb2: Created a new partition 2 of type 'Linux filesystem' and of size 11 GiB.
 /dev/sdb3: Created a new partition 3 of type 'Linux filesystem' and of size 11 GiB.
 /dev/sdb4: Created a new partition 4 of type 'Linux filesystem' and of size 11 GiB.
 /dev/sdb5: Created a new partition 5 of type 'Linux filesystem' and of size 11 GiB.
 /dev/sdb6: Created a new partition 6 of type 'Linux filesystem' and of size 11 GiB.
 /dev/sdb7: Created a new partition 7 of type 'Linux filesystem' and of size 3.2 GiB.
 /dev/sdb8: Done.
New situation:
Disklabel type: gpt
Disk identifier: F71BFBA6-D2C3-4C20-8079-1401B10C724C
Device         Start       End  Sectors  Size Type
 /dev/sdb1         64     32767    32704   16M unknown
 /dev/sdb2      32768  23101439 23068672   11G Linux filesystem
 /dev/sdb3   23101440  46170111 23068672   11G Linux filesystem
 /dev/sdb4   46170112  69238783 23068672   11G Linux filesystem
 /dev/sdb5   69238784  92307455 23068672   11G Linux filesystem
 /dev/sdb6   92307456 115376127 23068672   11G Linux filesystem
 /dev/sdb7  115376128 122167295  6791168  3.2G Linux filesystem
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

Get Image Files for the Distros

Change the directory to the Downloads folder:

cd ~/Downloads

Download your chosen image from PinePhone Pro Software Releases. Example releases (update the syntax to newer releases):

wget https://github.com/dreemurrs-embedded/Pine64-Arch/releases/download/20230203/archlinux-pinephone-pro-sxmo-20230203.img.xz
wget https://github.com/manjaro-pinephone/plasma-mobile/releases/download/beta15-rc4/Manjaro-ARM-plasma-mobile-pinephonepro-beta15-rc4.img.xz
wget https://images.mobian.org/pinephonepro/weekly/mobian-pinephonepro-phosh-20230903.img.xz
wget https://images.postmarketos.org/bpo/v23.06/pine64-pinephonepro/phosh/20230904-0846/20230904-0846-postmarketOS-v23.06-phosh-22.2-pine64-pinephonepro.img.xz
# to do (postmarketOS-edge-phosh via BootStrap)
wget https://gitlab.com/ook37/pinephone-pro-debos/-/jobs/4961858606/artifacts/file/ubuntu-touch-pinephone-unified.img.xz

Extract the compressed files:

xz -v -d -k archlinux-pinephone-pro-sxmo-20230203.img.xz
xz -v -d -k Manjaro-ARM-plasma-mobile-pinephonepro-beta15-rc4.img.xz
xz -v -d -k mobian-pinephonepro-phosh-20230903.img.xz
xz -v -d -k 20230904-0846-postmarketOS-v23.06-phosh-22.2-pine64-pinephonepro.img.xz
xz -v -d -k ubuntu-touch-pinephone-unified.img.xz

Mount the images

sudo su # login with your psw
losetup -P /dev/loop1 archlinux-pinephone-pro-sxmo-20230203.img && losetup -P /dev/loop2 Manjaro-ARM-plasma-mobile-pinephonepro-beta15-rc4.img && losetup -P /dev/loop3 mobian-pinephonepro-phosh-20230903.img && losetup -P /dev/loop4 20230904-0846-postmarketOS-v23.06-phosh-22.2-pine64-pinephonepro.img && losetup -P /dev/loop5 ubuntu-touch-pinephone-unified.img

ls -l /mnt/

mkdir /mnt/archlinux /mnt/archlinux/boot /mnt/archlinux/root && mkdir /mnt/manjaro /mnt/manjaro/boot /mnt/manjaro/root && mkdir /mnt/mobian /mnt/mobian/boot /mnt/mobian/root && mkdir /mnt/postmarketos /mnt/postmarketos/boot /mnt/postmarketos/root && mkdir /mnt/ubuntutouch /mnt/ubuntutouch/boot /mnt/ubuntutouch/root

mkdir /mnt/archlinuxsd && mkdir /mnt/manjarosd && mkdir /mnt/mobiansd && mkdir /mnt/postmarketossd && mkdir /mnt/ubuntutouchsd

mount /dev/loop1p1 /mnt/archlinux/boot/ && mount /dev/loop1p2 /mnt/archlinux/root/ && mount /dev/loop2p1 /mnt/manjaro/boot/ && mount /dev/loop2p2 /mnt/manjaro/root/ && mount /dev/loop3p1 /mnt/mobian/boot/ && mount /dev/loop3p2 /mnt/mobian/root/ && mount /dev/loop4p1 /mnt/postmarketos/boot/ && mount /dev/loop4p2 /mnt/postmarketos/root/ && mount /dev/loop5p1 /mnt/ubuntutouch/boot/ && mount /dev/loop5p2 /mnt/ubuntutouch/root/

Check mounted images:

lsblk

NAME      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
 loop1       7:1    0   3.5G  0 loop 
 ├─loop1p1 259:0    0   122M  0 part /mnt/archlinux/boot
 └─loop1p2 259:1    0   3.4G  0 part /mnt/archlinux/root
 loop2       7:2    0   6.3G  0 loop 
 ├─loop2p1 259:2    0 457.8M  0 part /mnt/manjaro/boot
 └─loop2p2 259:3    0   5.8G  0 part /mnt/manjaro/root
 loop3       7:3    0   5.6G  0 loop 
├─loop3p1 259:4    0   511M  0 part /mnt/mobian/boot
└─loop3p2 259:5    0   5.1G  0 part /mnt/mobian/root
loop4       7:4    0   2.3G  0 loop 
├─loop4p1 259:6    0   243M  0 part /mnt/postmarketos/boot
└─loop4p2 259:7    0   2.1G  0 part /mnt/postmarketos/root
loop5       7:5    0   3.7G  0 loop 
├─loop5p1 259:10   0 380.5M  0 part /mnt/ubuntutouch/boot
└─loop5p2 259:11   0   3.4G  0 part /mnt/ubuntutouch/root
sdb         8:16   1  58.3G  0 disk 
├─sdb1      8:17   1    16M  0 part 
├─sdb2      8:18   1    11G  0 part 
├─sdb3      8:19   1    11G  0 part 
├─sdb4      8:20   1    11G  0 part 
├─sdb5      8:21   1    11G  0 part 
├─sdb6      8:22   1    11G  0 part 
└─sdb7      8:23   1   3.2G  0 part 

Build Arch Linux partition

Login as root, copy rootfs and bootfs to the partition. You need also to make some changes on some files.

sudo dd if=/dev/loop1p2 of=/dev/sdb2 bs=1M status=progress conv=fsync
sudo mount /dev/sdb2 /mnt/archlinuxsd/
sudo scp -r /mnt/archlinux/boot/* /mnt/archlinuxsd/boot
sudo mv /mnt/archlinuxsd/boot/boot.scr /mnt/archlinuxsd/boot/boot.scrORIG

sudo su
cat << EOF > /mnt/archlinuxsd/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# UUID=fd049b8e-615f-4efd-bc96-622c4d40e6cb	/         	ext4      	rw,relatime	0 1
# UUID=841C-F9DD      	/boot     	vfat      	rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro	0 2
PARTLABEL=ALARM	/         	ext4      	rw,relatime	0 1
EOF

mkdir /mnt/archlinuxsd/boot/extlinux

sudo su
cat << EOF > /mnt/archlinuxsd/boot/extlinux/extlinux.conf
#/boot/extlinux/extlinux.conf
MENU TITLE Pinephone Pro Boot Menu
LABEL l0
MENU LABEL ALARM
FDT /boot/dtbs/rockchip/rk3399-pinephone-pro.dtb
KERNEL /boot/Image
INITRD /boot/initramfs-linux.img
APPEND root=PARTLABEL=ALARM console=ttyS2,115200 console=tty0 loglevel=4 rw rootwait
EOF

Build Manjaro partition

As for previous step proceed for next partition:

sudo dd if=/dev/loop2p2 of=/dev/sdb3 bs=1M status=progress conv=fsync
sudo mount /dev/sdb3 /mnt/manjarosd/
sudo scp -r /mnt/manjaro/boot/* /mnt/manjarosd/boot
sudo mv /mnt/manjarosd/boot/boot.scr /mnt/manjarosd/boot/boot.scrORIG

sudo su
cat << EOF > /mnt/manjarosd/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# PARTUUID=362866dc-95cf-4069-9bb8-623aa3cdcb5d   /   ext4     defaults    0   1
PARTLABEL=MANJARO   /   ext4     defaults    0   1
EOF

mkdir /mnt/manjarosd/boot/extlinux

sudo su
cat << EOF > /mnt/manjarosd/boot/extlinux/extlinux.conf
#/boot/extlinux/extlinux.conf
MENU TITLE Pinephone Pro Boot Menu
LABEL l0
MENU LABEL MANJARO
FDT /boot/dtbs/rockchip/rk3399-pinephone-pro.dtb
KERNEL /boot/Image
INITRD /boot/initramfs-linux.img
APPEND root=PARTLABEL=MANJARO console=ttyS2,115200 console=tty0 loglevel=4 rw rootwait
EOF

Build Mobian Partition

As for previous step proceed for next partition.

sudo dd if=/dev/loop3p2 of=/dev/sdb4 bs=1M status=progress conv=fsync
sudo mount /dev/sdb4 /mnt/mobiansd/
sudo scp -r /mnt/mobian/boot/* /mnt/mobiansd/boot

sudo su
cat << EOF > /mnt/mobiansd/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# UUID=31e45541-2b52-413a-9217-060082ce2ce8	/	ext4	defaults,x-systemd.growfs	0	1
# UUID=05106761-0b87-4729-a7f5-5a5a055c5e69	/boot	ext4	defaults,x-systemd.growfs	0	2
PARTLABEL=MOBIAN	/	ext4	defaults,x-systemd.growfs	0	1
EOF

adjust ## /boot/extlinux/extlinux.conf file
 >MENU LABEL MOBIAN
 >linux /boot/vmlinuz-6.1-rockchip
 >initrd /boot/initrd.img-6.1-rockchip
 >fdtdir /boot/dtb-6.1-rockchip/
 >APPEND root=PARTLABEL=MOBIAN console=ttyS2,115200 console=tty0 loglevel=4 rw rootwait

Build PostmarketOS Partition

sudo dd if=/dev/loop4p2 of=/dev/sdb5 bs=1M status=progress conv=fsync
sudo mount /dev/sdb5 /mnt/postmarketossd/
sudo scp -r /mnt/postmarketos/boot/* /mnt/postmarketossd/boot

sudo su
cat << EOF > /mnt/postmarketossd/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# <file system> <mount point> <type> <options> <dump> <pass>
#UUID=11f02090-b971-4739-a68d-c6e633b371f9 / ext4 defaults 0 0
#UUID=A84E-596C /boot fat32 defaults 0 0
PARTLABEL=PMOS / ext4 defaults 0 0
EOF

mkdir /mnt/postmarketossd/boot/extlinux

cat << EOF > /mnt/postmarketossd/boot/extlinux/extlinux.conf
## /boot/extlinux/extlinux.conf
## IMPORTANT WARNING
## The configuration of this file is generated automatically.
## Do not edit this file manually, use: u-boot-update
default l0
menu title U-Boot menu
prompt 0
timeout 10
label l0

menu label PMOS linux /boot/vmlinuz initrd /boot/initrdfs fdtdir /boot/dtbs-pine64-pinephonepro/

APPEND root=PARTLABEL=PMOS console=ttyS2,115200 console=tty0 loglevel=4 rw rootwait
EOF

Build Ubuntu Touch partition

sudo dd if=/dev/loop5p2 of=/dev/sdb6 bs=1M status=progress conv=fsync
sudo mount /dev/sdb6 /mnt/ubuntutouchsd/
sudo scp -r /mnt/ubuntutouch/boot/* /mnt/ubuntutouchsd/boot

sudo su
cat << EOF > /mnt/ubuntutouchsd/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
#UUID=dec2be75-3594-4078-b8c9-f3b215e6eac3	/	ext4	defaults	0	1
#UUID=657dc3ea-dcfa-498b-a231-dbc29f6e1bfb	/boot	ext4	defaults	0	2
PARTLABEL=UT	/	ext4	defaults	0	1
EOF

sudo su
cat << EOF > /mnt/ubuntutouchsd/boot/extlinux/extlinux.conf
#/boot/extlinux/extlinux.conf
##
## IMPORTANT WARNING
##
## The configuration of this file is generated automatically.
## Do not edit this file manually, use: u-boot-update
default l0
menu title U-Boot menu
prompt 0
timeout 50
label l0
       menu label UT
       linux /boot/vmlinuz-6.5.0-okpine
       initrd /boot/initrd.img-6.5.0-okpine
       fdtdir /boot/dtb-6.5.0-okpine/
#       append root=UUID=dec2be75-3594-4078-b8c9-f3b215e6eac3 console=ttyS2,115200n8 consoleblank=0 loglevel=7 rw spl>
APPEND root=PARTLABEL=UT console=ttyS2,115200 console=tty0 loglevel=4 rw rootwait

#label l0r
#       menu label UT rescue
#       linux /boot/vmlinuz-6.5.0-okpine
#       initrd /boot/initrd.img-6.5.0-okpine
#       fdtdir /boot/dtb-6.5.0-okpine/
#       append root=UUID=dec2be75-3594-4078-b8c9-f3b215e6eac3 console=ttyS2,115200n8 consoleblank=0 loglevel=7 rw spl>
EOF

Unmount all /dev

sudo umount /mnt/archlinuxsd /mnt/manjarosd /mnt/mobiansd /mnt/postmarketossd /mnt/ubuntutouchsd /mnt/*/boot /mnt/*/root

Multi-Distro on eMMC

Options to boot Phosh or sxmo

Make sure you boot from the microSD card in your PinePhone Pro as we are going to overwrite the eMMC. Note that below, Arch is booted from the microSD card and the microSD card is listed as the device /dev/mmcblk1.

Flash Rk2Aw Loader to SPI

Same as above. Note this installs rk2aw and a bootloader to SPI NOR flash. Resulting SPI status is as follows:

# ./rk2aw-spi-flasher 
Machine: Pine64 PinePhonePro (pine64,pinephone-pro)
SPI NOR Flash:
- Total size: 16384 KiB
- Erase block size: 4 KiB
- Write size: 1
- Manufacturer: gigadevice
- Part name: gd25lq128e
- JEDEC ID: 257018

Bootable images currently present in SPI NOR flash:
Idx Header     Off 1      Size 1     Off 2      Size 2     Notes/content
-------------------------------------------------------------------------------
0   0          2048       6144       0          0          (padded) 0='rk2aw'
5   131072     133120     67584      200704     124928     0='U-Boot TPL' 1='U-Boot SPL'
7   524288     526336     147456     673792     124928     0='ddrbin' 1='U-Boot SPL'

Auto-calculated layout for rk2aw dual bootloader scheme:
Area                 Offset     Size      
---------------------------------------------------
rk2aw primary        0          65536     
rk2aw backup         65536      65536     
spl fallback         131072     393216    
spl primary          524288     389120    
itb fallback         913408     2097152   
itb primary          3010560    2097152

Build Multi-Distro eMMC

In this example we are going to build 2 partitions on the eMMC, the first with Arch/Phosh and the second with Arch/sxmo. We have already downloaded the images from Danct12 and decompressed them.

Mount the Images

cd ~/Downloads # enter to directory
sudo su # login with your psw
losetup -P /dev/loop0 archlinux-pinephone-pro-phosh-20230203.img 
losetup -P /dev/loop1 archlinux-pinephone-pro-sxmo-20230203.img 
ls -l /mnt/
mkdir /mnt/phosh
mkdir /mnt/sxmo
mkdir /mnt/phosh/boot
mkdir /mnt/phosh/root
mkdir /mnt/sxmo/boot
mkdir /mnt/sxmo/root
mkdir /mnt/ephosh # e for the partition on the eMMC
mkdir /mnt/esxmo  # e for the partition on the eMMC
mount /dev/loop0p1 /mnt/phosh/boot/
mount /dev/loop0p2 /mnt/phosh/root/
mount /dev/loop1p1 /mnt/sxmo/boot/
mount /dev/loop1p2 /mnt/sxmo/root/

lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
loop0          7:0    0     5G  0 loop 
├─loop0p1    259:0    0   122M  0 part /mnt/phosh/boot
└─loop0p2    259:1    0   4.9G  0 part /mnt/phosh/root
loop1          7:1    0   3.5G  0 loop 
├─loop1p1    259:2    0   122M  0 part /mnt/sxmo/boot
└─loop1p2    259:3    0   3.4G  0 part /mnt/sxmo/root
mmcblk2      179:0    0 115.2G  0 disk 
├─mmcblk2p1  179:1    0   122M  0 part 
└─mmcblk2p2  179:2    0 115.1G  0 part 
mmcblk2boot0 179:32   0     4M  1 disk 
mmcblk2boot1 179:64   0     4M  1 disk 
mmcblk1      179:96   0  59.6G  0 disk 
├─mmcblk1p1  179:97   0   122M  0 part /boot
└─mmcblk1p2  179:98   0  59.5G  0 part /
zram0        254:0    0   1.5G  0 disk [SWAP]

Prepare eMMC

dd if=/dev/zero of=/dev/mmcblk2 count=32768 bs=32768 status=progress # overwrite the front to clear any bootloaders

sfdisk /dev/mmcblk2 << EOF
label: gpt
first-lba: 64
table-length: 8
size=32G, name="PHOSH", attrs="RequiredPartition,LegacyBIOSBootable"
size=+, name="SXMO", attrs="RequiredPartition,LegacyBIOSBootable"
EOF

Checking that no-one is using this disk right now ... OK
Disk /dev/mmcblk2: 115.23 GiB, 123731968000 bytes, 241664000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
>>> Script header accepted.
>>> Created a new GPT disklabel (GUID: 7EB4B1E0-5F49-4F30-9F1E-E9E1F305D461).
The maximal number of partitions is 8 (default is 128).
/dev/mmcblk2p1: Created a new partition 1 of type 'Linux filesystem' and of size 32 GiB.
/dev/mmcblk2p2: Created a new partition 2 of type 'Linux filesystem' and of size 83.2 GiB.
/dev/mmcblk2p3: Done.

New situation:
Disklabel type: gpt
Disk identifier: 7EB4B1E0-5F49-4F30-9F1E-E9E1F305D461
Device            Start       End   Sectors  Size Type
/dev/mmcblk2p1     2048  67110911  67108864   32G Linux filesystem
/dev/mmcblk2p2 67110912 241661951 174551040 83.2G Linux filesystem
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

lsblk
 NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
 loop0          7:0    0     5G  0 loop 
 ├─loop0p1    259:0    0   122M  0 part /mnt/phosh/boot
 └─loop0p2    259:1    0   4.9G  0 part /mnt/phosh/root
 loop1          7:1    0   3.5G  0 loop 
 ├─loop1p1    259:2    0   122M  0 part /mnt/sxmo/boot
 └─loop1p2    259:3    0   3.4G  0 part /mnt/sxmo/root
 mmcblk2      179:0    0 115.2G  0 disk 
 ├─mmcblk2p1  179:1    0    32G  0 part 
 └─mmcblk2p2  179:2    0  83.2G  0 part 
 mmcblk2boot0 179:32   0     4M  1 disk 
 mmcblk2boot1 179:64   0     4M  1 disk 
 mmcblk1      179:96   0  59.6G  0 disk 
 ├─mmcblk1p1  179:97   0   122M  0 part /boot
 └─mmcblk1p2  179:98   0  59.5G  0 part /
 zram0        254:0    0   1.5G  0 disk [SWAP]

Build Phosh Partition

dd if=/dev/loop0p2 of=/dev/mmcblk2p1 bs=1M status=progress conv=fsync
mount /dev/mmcblk2p1 /mnt/ephosh/
scp -r /mnt/phosh/boot/* /mnt/ephosh/boot
mv /mnt/ephosh/boot/boot.scr /mnt/ephosh/boot/boot.scrORIG

cat << EOF > /mnt/ephosh/etc/fstab
 #/boot/extlinux/extlinux.conf
 #Static information about the filesystems.
 #See fstab(5) for details.
 #<file system> <dir> <type> <options> <dump> <pass>
 PARTLABEL=PHOSH 	/   ext4   rw,relatime	0 1
 # UUID=52CA-6165  /boot vf rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro	0 2

mkdir /mnt/ephosh/boot/extlinux

cat << EOF > /mnt/ephosh/boot/extlinux/extlinux.conf
 #/boot/extlinux/extlinux.conf
 MENU TITLE Pinephone Pro Boot Menu
 LABEL l0
 MENU LABEL phosh
 FDT /boot/dtbs/rockchip/rk3399-pinephone-pro.dtb
 KERNEL /boot/Image
 INITRD /boot/initramfs-linux.img
 APPEND root=PARTLABEL=PHOSH console=ttyS2,115200 console=tty0 loglevel=4 rw rootwait
 EOF

Build SXMO Partition

We have unmounted all the Phosh devices, so

lsblk
 NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
 loop0          7:0    0     5G  0 loop 
 ├─loop0p1    259:0    0   122M  0 part 
 └─loop0p2    259:1    0   4.9G  0 part 
 loop1          7:1    0   3.5G  0 loop 
 ├─loop1p1    259:2    0   122M  0 part /mnt/sxmo/boot
 └─loop1p2    259:3    0   3.4G  0 part /mnt/sxmo/root
 mmcblk2      179:0    0 115.2G  0 disk 
 ├─mmcblk2p1  179:1    0    32G  0 part 
 └─mmcblk2p2  179:2    0  83.2G  0 part 
 mmcblk2boot0 179:32   0     4M  1 disk 
 mmcblk2boot1 179:64   0     4M  1 disk 
 mmcblk1      179:96   0  59.6G  0 disk 
 ├─mmcblk1p1  179:97   0   122M  0 part /boot
 └─mmcblk1p2  179:98   0  59.5G  0 part /
 zram0        254:0    0   1.5G  0 disk [SWAP]

dd if=/dev/loop1p2 of=/dev/mmcblk2p2 bs=1M status=progress conv=fsync
mount /dev/mmcblk2p2 /mnt/esxmo/
scp -r /mnt/sxmo/boot/* /mnt/esxmo/boot
mv /mnt/esxmo/boot/boot.scr /mnt/esxmo/boot/boot.scrORIG

cat << EOF > /mnt/esxmo/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
PARTLABEL=SXMO /     ext4      	rw,relatime	0 1
# UUID=841C-F9DD      	/boot     	vfat      	rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro	0 2
EOF

mkdir /mnt/esxmo/boot/extlinux

cat << EOF > /mnt/esxmo/boot/extlinux/extlinux.conf
 #/boot/extlinux/extlinux.conf
 MENU TITLE Pinephone Pro Boot Menu
 LABEL l0
 MENU LABEL sxmo
 FDT /boot/dtbs/rockchip/rk3399-pinephone-pro.dtb
 KERNEL /boot/Image
 INITRD /boot/initramfs-linux.img
 APPEND root=PARTLABEL=SXMO console=ttyS2,115200 console=tty0 loglevel=4 rw rootwait
EOF

Follow-Up Comments

1. On first boot neither Phosh nor sxmo resized their partition - sudo resize2fs sorted that.
2. Any time an update rebuilds the initramfs it is necessary to delete /boot/boot.scr again to keep the rk2aw menu clean.