I want to enable PCIe controller C4 on Xavier in root-complex mode. Based on OEM and ODMDATA setting (pcie-xbar-4-1-0-1-2), C4 can only use 2 lanes: UPHY8 and UPHY9. However, C4 seems disabled in devkit.
My questions are:
- Can C4 be enabled in root-complex mode and using 2 lanes (UPHY8 and UPHY9)?
- If so, what need to do to enable C4? Just need to change Linux device-tree to enable C4 and set its uphy mapping properly? Do I need any change in BPMP-DTB or ODMDATA, or anything else?