TQMa8Mx - YOCTO Linux BSP documentation

Known Issues BSPs

Known Issues scarthgap.TQ.ARM.BSP.0006

Linux: operating points for DDR controller missing in device tree. running at lower DDR frequencies does not work in this version of BSP.
Default setting for fdt_file in u-boot from older BSP version does not match kernel naming scheme since linux 5.10. Use U-Boot from this BSP release or see Build Artifacts for complete list of supported Device Tree files.
LVDS shows wrong colors on older Tianma display kit (HW issue on older display kit revisions)
USB OTG / DRD
- USB OTG OC not handled for host role
- USB OTG: only host is working in U-Boot
- 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 ...
```
QSPI limited to SDR (driver / chip compatibility)
Mikrobus Modul RTC5 on ecspi1 don't answer
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
- MIPI CSI does not work reliably. It may work, it may fail or even lockup the system
When using HDMI the default Audio device changes to HDMI output. For using DAI codec aplay requires the parameter -Dsysdefault:CARD=tqmtlv320aic32
The HDMI audio device has to be selected explicitely by passing -Dsysdefault:CARD=imxaudiohdmi to aplay & friends
HDMI: When using large displays, module variants with> = 2 GiB RAM are recommended. It is known that some use cases will not work with less memory. Like Weston on a 4K monitor
Note: GPU temperature observation uses CPU thermal-zone! Playing 4K Videos on 4K Display will raise the thermal-zone (CPU) temperature >80°C, reducing VPU clock. Apparently there is no dedicated VPU sensor
PCIe driver causes several warnings during suspend
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.
DT-Overlays imx8mq-tqma8mq-mba8mx-dcss-hdmi.dtso and imx8mq-tqma8mq-mba8mx-dcss-lvds.dtso are mutual exlusive.
- Only one display can be used by DCSS at the same time.