How to build Android 9 for the Rock64
Follow the steps on the repository here:

repo init --depth=1 -u -m a9rock64_us.xml -b default

repo sync  -f -c --no-clone-bundle --no-tags -j$(nproc --all)

. build/

I made a docker image with the required build environment dependencies:
When I build using the method outlined above, I get the following error:

/bin/bash -c "(make -j3 -C /home/lineageos/external/rk_tee_user O=/home/lineageos/external/rk_tee_user TA_DEV_KIT_DIR=/home/lineageos/external/rk_tee_user/export-user_ta clean ) && (make -j3 -C /home/lineageos/external/rk_tee_user CROSS_COMPILE=\$(pwd)/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi- CROSS_COMPILE_HOST=\$(pwd)/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi- CROSS_COMPILE_TA=\$(pwd)/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi- CROSS_COMPILE_user_ta=\$(pwd)/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi- TA_DEV_KIT_DIR=/home/lineageos/external/rk_tee_user/export-user_ta O=/home/lineageos/external/rk_tee_user )"
make: Entering directory '/home/lineageos/external/rk_tee_user'
make[1]: Entering directory '/home/lineageos/external/rk_tee_user/ta'
make[2]: Entering directory '/home/lineageos/external/rk_tee_user/ta/testapp'
 CLEAN   .
make[2]: Leaving directory '/home/lineageos/external/rk_tee_user/ta/testapp'
make[2]: Entering directory '/home/lineageos/external/rk_tee_user/ta/testapp_storage'
 CLEAN   .
make[2]: Leaving directory '/home/lineageos/external/rk_tee_user/ta/testapp_storage'
make[1]: Leaving directory '/home/lineageos/external/rk_tee_user/ta'
make: Leaving directory '/home/lineageos/external/rk_tee_user'
make: Entering directory '/home/lineageos/external/rk_tee_user'
make[1]: Entering directory '/home/lineageos/external/rk_tee_user/ta'
make[2]: Entering directory '/home/lineageos/external/rk_tee_user/ta/testapp'
 CPP     /home/lineageos/external/rk_tee_user/ta/testapp/
 /home/lineageos/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi-gcc      /home/lineageos/external/rk_tee_user/ta/testapp/user_ta_header.o
 /home/lineageos/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi-gcc      /home/lineageos/external/rk_tee_user/ta/testapp/testapp_ta.o
 LD      /home/lineageos/external/rk_tee_user/ta/testapp/8cccf200-2450-11e4-abe20002a5d5c52c.elf
 OBJDUMP /home/lineageos/external/rk_tee_user/ta/testapp/8cccf200-2450-11e4-abe20002a5d5c52c.dmp
 OBJCOPY /home/lineageos/external/rk_tee_user/ta/testapp/8cccf200-2450-11e4-abe20002a5d5c52c.stripped.elf
 SIGN    /home/lineageos/external/rk_tee_user/ta/testapp/8cccf200-2450-11e4-abe20002a5d5c52c.ta
 SIGN KEY /home/lineageos/external/rk_tee_user/export-user_ta/keys/oem_privkey.pem
Traceback (most recent call last):
 File "/home/lineageos/external/rk_tee_user/export-user_ta/scripts/", line 80, in <module>
 File "/home/lineageos/external/rk_tee_user/export-user_ta/scripts/", line 40, in main
   from Crypto.Signature import PKCS1_v1_5
ImportError: No module named Crypto.Signature
/home/lineageos/external/rk_tee_user/export-user_ta/mk/ recipe for target '/home/lineageos/external/rk_tee_user/ta/testapp/8cccf200-2450-11e4-abe20002a5d5c52c.ta' failed
make[2]: *** [/home/lineageos/external/rk_tee_user/ta/testapp/8cccf200-2450-11e4-abe20002a5d5c52c.ta] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/lineageos/external/rk_tee_user/ta/testapp'
Makefile:37: recipe for target 'ta' failed
make[1]: *** [ta] Error 2
make[1]: Leaving directory '/home/lineageos/external/rk_tee_user/ta'
Makefile:27: recipe for target 'ta' failed
make: *** [ta] Error 2
make: Leaving directory '/home/lineageos/external/rk_tee_user'
[ 10% 9248/90512] Export includes file:  -- out/target/product/
ninja: build stopped: subcommand failed.
17:07:14 ninja failed with: exit status 1

Fixed by installing pycrypto:

pip install pycrypto
Good to have the instructions here. Thanks.
Are there any special tricks to include opengapps into the build?
Haven't gotten that far <3
Sorry my friend. The binary image of android9 for rock64 does not have Gapps at all. I thought i should do something special to add them to the repo. But they seem to be cloned along with other staff.
What is expected download size?
Of the repo entire 9 repo? Probably around 100 GB.

Not sure how much just the gapps repo is.
Ohoh. Got bus error after 8 hours of compile

Copying resources from program jar [/a9rock64/out/target/common/obj/APPS/DefaultContainerService_intermediates/classes.jar]
[ 71% 64419/90512] target Package: BackupRestoreConfirmation (out/tar...328_box/obj/APPS/BackupRestoreConfirmation_intermediates/package.apk)
warning: ignoring flag -c tvdpi-v4. Use --preferred-density instead.
warning: ignoring flag -c hdpi-v4. Use --preferred-density instead.
warning: ignoring flag -c tvdpi-v4. Use --preferred-density instead.
warning: ignoring flag -c hdpi-v4. Use --preferred-density instead.
[ 71% 64422/90512] Copy: out/target/common/obj/APPS/MediaProvider_intermediates/classes.jar07:40:03 ninja failed with: signal: bus error (core dumped)

#### failed to build some targets (08:17:30 (hh:mmConfuseds)) ####

The seems to start from the beginning every time despite the compilation status. Is it possible to continue process somehow?
Seems that i got through the build process

/a9rock64/rockdev/Image-rk3328_box$ ll
total 4284032
drwxrwxr-x 2 als als 4096 Jul 24 14:29 .
drwxrwxr-x 3 als als 4096 Jul 24 14:28 ..
-rwxrwxr-x 1 als als 1048576 Jul 23 22:49 baseparameter.img
-rw-rw-r-- 1 als als 19806208 Jul 24 14:28 boot.img
-rwxrwxr-x 1 als als 307 Jul 23 22:49 dtbo.img
-rw-rw-r-- 1 als als 19535892 Jul 24 12:27 kernel.img
-rw-rw-r-- 1 als als 184654 Jul 24 12:13 MiniLoaderAll.bin
-rwxrwxr-x 1 als als 49152 Jul 23 22:54 misc.img
-rw-rw-r-- 1 als als 159820 Jul 24 14:28 oem.img
-rwxrwxr-x 1 als als 870 Jul 23 22:49 parameter.txt
-rw-rw-r-- 1 als als 49152 Jul 23 22:54 pcba_small_misc.img
-rw-rw-r-- 1 als als 49152 Jul 23 22:54 pcba_whole_misc.img
-rw-rw-r-- 1 als als 30148608 Jul 24 14:28 recovery.img
-rw-rw-r-- 1 als als 265728 Jul 24 12:35 resource.img
-rw-rw-r-- 1 als als 1986302160 Jul 24 14:28 system.img
-rw-rw-r-- 1 als als 4194304 Jul 24 12:13 trust.img
-rw-rw-r-- 1 als als 4194304 Jul 24 12:13 uboot.img
-rw-rw-r-- 1 als als 2184098264 Jul 24 14:29 update.img
-rwxrwxr-x 1 als als 4096 Jul 23 22:49 vbmeta.img
-rw-rw-r-- 1 als als 137805924 Jul 24 14:28 vendor.img

will try to burn this
well done - let me know how it goes <3
Thank you, dazza
Flashed it without problems, but i see some issues with screen on this build. It continuously blinks changing resolution randomly while surfing through the home screen and launching apps. The box is connected to quite old Philips fullhd TV. I do not remember this behavior on stock binary. And there is not possible to change display resolution from Auto. Not good but i can live with that.
Another annoying feature is randomly changing MAC address of eth0 with every new image - it costs 5euro every time to register SIPTV app to new MAC addr ))
I seem to find how to fix that with uboot environment CONFIG_ETHADDR written directly to u-boot/configs/rk3328_defconfig and uboot recompilation. Will check this weekend if it works. Not sure if there is any other method.
Finally i rooted the image with Magisk using the method described in RKDocs/android/Rockchip_Magisk_installation_guidelines.pdf of the repository.

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