I thought in the Ayufan scripts there was an option to reactivate SPI from Linux: a lot of his RockPro64 stuff is under his Rock64 names/directories. I am not in front of my RockPro today but there are a whole bunch of his scripts under /usr/ somewhere - could be worth having one of his (4.4 kernel) releases on your SDcard.
ps - I have never had a serial cable for a console.
ps - I have never had a serial cable for a console.
- ROCKPro64 v2.1 2GB, 16Gb eMMC for rootfs, SX8200Pro 512GB NVMe for /home, HDMI video & sound, Bluetooth keyboard & mouse. Arch (6.12 kernel, Openbox desktop) for general purpose daily PC.
- PinePhone Pro Explorer Edition, daily driver, rk2aw & U-boot on SPI, Arch/SXMO on eMMC
- PinePhone BraveHeart now v1.2b 3/32Gb, Tow-boot with pmOS/SXMO on eMMC