Marvell PXA1908

Marvell PXA1908 is a low-end ARM64 SoC, released in either late 2014 or 2015 according to various online sources.

Mainline
A work-in-progress tree is available here.

Due to some S-Boot quirks (unable to pass initramfs to kernel and does not properly start the ARM system timer), the kernel can't be packaged for postmarketOS nor upstreamed at the moment.