K3 is now natively supported in the Linux Kernel mainline, with key SoC enablement already merged for Linux 7.0!
You can find the K3 DTS files under arch/riscv/boot/dts/spacemit/ in the upstream tree: k3.dtsi, k3-pico-itx.dts.
What’s in Linux 7.0 already (merged upstream):
Basic DeviceTree
Pinctrl, GPIO
Clock, Reset
UART,PMIC (p1),SDHCI (eMMC)














