Other Parts Discussed in Thread: TMDS243EVM, , AM2434
Tool/software:
Hi, experts,
The Raspberry Pi CM5 (PCIe RC) cannot properly enumerate the AM2431 (TMDS243EVM, PCIe EP).
I have rebuilt the kernel with VFIO and IOMMU enabled on WSL2 and successfully booted the Raspberry Pi CM5 with kernel version 6.12.40-v8-16k+.
However, simply connecting the CM5 and TMDS243EVM does not result in enumeration.
(The log shows “PCIe: EP initialized and waiting for link”, but never “PCIe: link detected”.)
Currently, enumeration works only under the following sequence:
-
Connect a NIC (which works properly as a PCIe network interface card) to the PCIe connector of the CM5 IO board via an M.2 to PCIe riser, then reboot the CM5 → enumeration succeeds.
-
Disconnect the NIC, connect the TMDS243EVM PCIe EP, then reboot the CM5 → enumeration also succeeds.
(Only then do I see the “PCIe: link detected” message in the logs.)
So, the enumeration issue itself still needs to be resolved.
In addition, even when I run the following command on the CM5:
echo "17cd 0100" > /sys/bus/pci/drivers/vfio-pci/new_id
the following messages do not appear:
The current development environment is
TI CCS : 20.3.0
SDK : 11.01.00.17
Win11
PCIe RC Board : raspberry pi CM5, CM5io
PCIe EP Board : TMDS243EVM
(Resistors R661, R662, R667 & R668 removed)
(Resistors R665, R666, R679 & R680 (all 0 ohm) populated)
example : pcie_enumerate_ep
