How old is your u-boot version? You need to fairly new one 2021.07 or newer if I recall correctly, there are also issues with 4k displays (I've only used 1080p and below). If you have (at least cheap adapters) you might also run into issues, https://wiki.freebsd.org/arm/RockChip#Known_issues
PCIe Gen2 training very sensitive from what I recall, it seems to work on my boards at least but I would imagine it's highly dependent on device being used.
I'd be happy to add any PCIe you test on your RockPro64 success or failure, just send me a PM of what you've tested etc.
You can look at the table to determine required information, https://wiki.freebsd.org/arm/RockChip#Tested_PCIe_devices_on_RockPro64
PCIe Gen2 training very sensitive from what I recall, it seems to work on my boards at least but I would imagine it's highly dependent on device being used.
Code:
igb0@pci0:1:0:0: class=0x020000 rev=0x01 hdr=0x00 vendor=0x8086 device=0x1521 subvendor=0x1734 subdevice=0x11cf
vendor = 'Intel Corporation'
device = 'I350 Gigabit Network Connection'
class = network
subclass = ethernet
cap 01[40] = powerspec 3 supports D0 D3 current D0
cap 05[50] = MSI supports 1 message, 64 bit, vector masks
cap 11[70] = MSI-X supports 10 messages, enabled
Table in map 0x1c[0x0], PBA in map 0x1c[0x2000]
cap 10[a0] = PCI-Express 2 endpoint max data 128(512) FLR RO NS
max read 512
link x2(x4) speed 2.5(5.0) ASPM disabled(L0s/L1)
ecap 0001[100] = AER 2 0 fatal 0 non-fatal 2 corrected
ecap 0003[140] = Serial 1 001999fffffe8651
ecap 000e[150] = ARI 1
ecap 0010[160] = SR-IOV 1 IOV disabled, Memory Space disabled, ARI disabled
0 VFs configured out of 8 supported
First VF RID Offset 0x0180, VF RID Stride 0x0004
VF Device ID 0x1520
Page Sizes: 4096 (enabled), 8192, 65536, 262144, 1048576, 4194304
ecap 0017[1a0] = TPH Requester 1
ecap 0018[1c0] = LTR 1
ecap 000d[1d0] = ACS 1
I'd be happy to add any PCIe you test on your RockPro64 success or failure, just send me a PM of what you've tested etc.
You can look at the table to determine required information, https://wiki.freebsd.org/arm/RockChip#Tested_PCIe_devices_on_RockPro64