Prebuilt u-boot-rockchip.bin & u-boot-rockchip-spi.bin are included in a bootable sdcard.img
for convenience
RockPro64 - Builds/RP64/
PinebookPro - Builds/PBP/
-
Debian based OS already running on an ARM64 CPU
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Any microSD in the /dev/mmcblk1 slot
--> FLASHING
--> SIGNING