Known Issues

USB camera warning and error messages when running AI applications

The following warning and error messages may appear in the terminal when running AI applications that use USB 2.0 cameras on the RZ/V2H RDK:

[ 3495.792814] xhci-renesas-hcd 15860000.usb: WARN: HC couldn't access mem fast enough for slot 1 ep 2
[ 3495.801878] xhci-renesas-hcd 15860000.usb: WARN: HC couldn't access mem fast enough for slot 1 ep 2
[ 3495.810911] xhci-renesas-hcd 15860000.usb: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13
[ 3495.821917] xhci-renesas-hcd 15860000.usb: Looking for event-dma 000000004b0b1190 trb-start 000000004b0b11a0 trb-end 000000004b0b11a0 seg-start 000000004b0b1000 seg-end 000000004b0b1ff0
[ 3496.032127] xhci-renesas-hcd 15860000.usb: WARN: HC couldn't access mem fast enough for slot 1 ep 2
[ 3496.041226] xhci-renesas-hcd 15860000.usb: WARN: HC couldn't access mem fast enough for slot 1 ep 2
[ 3496.299376] xhci-renesas-hcd 15860000.usb: WARN: HC couldn't access mem fast enough for slot 1 ep 2

These messages do not affect the functionality of the USB camera or the performance of the AI applications. The applications continue to operate as expected.

Note

This issue does not occur with USB 3.0 cameras on the RZ/V2H RDK.

We are actively investigating the root cause and working towards a resolution.

Some SD cards may not work properly with the RZ/V2H RDK

Some SD cards may not function correctly with the RZ/V2H RDK, leading to issues such as failure to boot or read/write errors.

To ensure compatibility, use SD cards that support high-speed mode from reputable brands such as SanDisk, Samsung, or Kingston.
The Ethernet may not work properly when booting up the board

The following error may occur when booting Ubuntu 24.04 on the RZ/V2H RDK, causing no Internet connection even though the Ethernet cable is connected:
```
[   17.664297] dwc-eth-dwmac 15c30000.ethernet end0: __stmmac_open: Cannot attach to PHY (error: -110)
```
To resolve this issue:
1. Power off the board.
2. Unplug the Ethernet cable.
3. Power on the board.
4. Wait until the system fully boots.
5. Plug the Ethernet cable back in.