sdyspb

I've already sent them my fix in WeChat (Tom Cubie and his team). They promised to take a look at my point. Of course, asking them on forum is a great idea

Just look at this from datasheet and schematic perspective - ASM1164 needs SSC if SRIS is enabled, but according to datasheet of clock generator there is no SSC, so the original schem is not correct. There are three solutions: 1) place somehow clock with SSC or the best one is adding the independent clock for ASM1164 2) unsolder R29 to disable SRIS 3) disable SRIS by software At this moment I choose number two, but if you find the third one I will stand on your side Actually, SRIS means that RC and EP are clocked by different sources (I think it is like SSC where some jitter always exists), but in Radxa 5 ITX all the clocks are produced by one oscillator, so, SRIS is not right mode for this board. According to PCIe architecture the board uses Common REFCLK, not SRIS. Due to Common Clock the PLL of ASM1164 can't sync in SRIS mode because it needs a little deviation to be locked

It sounds wrong. There is no degradation in speed. Also, your assumption about SSC of the clock generator is wrong as well. According to datasheet of AU5426, it does not support SSC

You really need a good soldering iron and tip because of big ground plane on bottom PS It's funny to recommend soldering iron in a software chat to fix the kernel problem

I fixed my Rock 5 ITX by unsoldering R29 pull-down resistor. There was wrong HW configuration of ASM1164. Now all kernels work as well as vendor's one, including the last images from Armbian - Debian12 (Bookworm) + OMV. The more details in Radxa forum.