Embedded module TQMa8MPxL - YOCTO Linux BSP documentation


Known Issues

Known Issues BSPs

Known Issues Scarthgap.TQ.ARM.BSP.0004

  • REV.020x SoM without variant data in EEPROM (prototypes)

    • With the default U-Boot configuration the boot flow is interrupted in SPL and waits for input of the assembled RAM size (1, 2, 4, 8).
    • Use fixed 2GB U-Boot configuration. This is built by default UBOOT_CONFIG entries sd-2gb and mfgtool-2gb Note: the generated wic-File uses the U-Boot multi RAM config

  • MIPI CSI

    • driver stack is not completely v4l2-compliance test proof. The IOCTLS for format / resolution enumeration and query can return invalid / wrong values depending of the internal state of the driver stack. Please follow given examples for a working setup.
    • IMX327: bayer support with 12 Bit does not work at the moment, only 10 Bit with 1280x720 is tested with gstreamer
    • IMX327: when configuring to SRGGB12 reboot may be needed to get a working capture again
    • OV9281: gstreamer does not support Y10 format

  • 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.

  • A reset using button S7 will not reset the SD card properly. Especially if the SD card is operating on 1.8V it will be non-functional after reset. Use button S8 instead.

  • PCIe

    • Some WiFi modules might not be supported
    • Suspend to RAM not supported. Disable PCIe RC node in device tree
      &pcie {
status = "disabled";
};

  • Audio

    • Suspend to RAM does not work reliably. Disable sound node in device tree
      sound {
compatible = "fsl,imx-audio-tlv320aic32x4";
[...]
status = "disabled";
};

  • 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 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-imx / linux-fslc: Review indicated that, by default, device tree reserves memory for NPU in an area which is only available on 4GiB DDR RAM config. Upstream kernel is not affected.

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

    • Suspend & resume not supported (yet)

  • MBa8MP-RAS314

    • no support for vendor kernel and BSP