Embedded module TQMa8MPxS - YOCTO Linux BSP documentation

Ethernet

• Possible communication error to PHY attached to FEC, reboot required to fix
• ETH1 looses manual assigned IP after suspend/resume. Default systemd network configuration uses DHCP with fallback. Has to be adjusted if needed.

USB Host

• USB Superspeed U3 powersave mode is broken
• U-Boot: some USB stick types are not working correctly in U-Boot. After usb reset they may fail to enumerate correctly or causing a system reset during enumeration with errors like:

  WARN halted endpoint, queueing URB anyway.
  Unexpected XHCI event TRB, skipping... (fbf120f0 00000000 13000000 03008401)
  BUG at drivers/usb/host/xhci-ring.c:496/abort_td()!
  BUG!
  �esetting ...

USB 2.0 DRD (X4):

• Linux: no detection of USB devices in host mode
• U-Boot: limited to peripheral in (dual role not supported by upstream DWC3 driver)

USB 3.0 micro (X3)

• peripheral mode not supported (hardware limitation on SoM, connected to Hub)
• USB 3.0 devices are known to cause over-current condition

USB Bluetooth:

• Some adapters cause the following error during bootup

  Bluetooth: hci0: unexpected event for opcode 0xfc2f

  According to https://lkml.org/lkml/2019/6/6/868 this can be ignored

UBI / UBIFS images are enabled by default when using DISTRO=spaetzle[-nxp]. The generated rootfs size must not exceed the size defined by UBI_LEB_SIZE and UBI_MAX_LEB_COUNT on machine level.

Kernel based on linux-tq / linux-rt-tq

• Suspend & resume not supported (yet)

no support for vendor kernel and BSP

SER2's RTS and CTS signals are controlled by GPIO only