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Comment: Add known issue for kernel-module-laird-backports

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  • Ethernet:
    • iperf3 is included with the Krogoth Yocto BSP. With UDP, this command reports much lower bandwidth than expected when compared with iperf command.

  • eMMC:

    • Flashing with U-Boot: 
      • fsl-image-gui-imx7d-phyboard-zeta.sdcard image is too large to be loaded into memory (1GB) from u-boot.
      • Workaround: Partition and flash eMMC from Linux instead. See Quickstart for instructions.
  • Linux IMX Busfreq driver:
    • Driver disabled by default due to impaired UART console functionality when the system is idle (Low frequency setpoint).

    • For dynamic bus frequency scaling and improved power consumption, the busfreq driver can be enabled in the device tree by removing the "fsl,freq_scaling_disabled" property in imx7-phycore-som.dtsi. It can also be controlled in Linux sysfs: 

      echo 1 > /sys/bus/platform/drivers/imx_busfreq/soc\:busfreq/enable
  • 256MB NAND is too small to flash fsl-image-gui filesystem. Booting from NAND was tested with core-image-minimal Yocto image, which is included with release binaries.
  • Yocto kernel-module-laird-backports fetch error: LSR has released a new version of the package being fetched in this recipe, and replaced the tarball on their website with the same name. This is resulting in a checksum mismatch.
    • Workaround: See Quickstart section "Yocto Build Steps".

NXP Known Issues

See i.MX Linux Release Notes from NXP in  L4.1.15_2.0.0_LINUX_DOCS

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