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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.
- Flashing with U-Boot:
- 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
- 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 results in a checksum mismatch.
- Workaround: See Quickstart section "Yocto Build Steps".
Kit imx7s-phyboard-zeta-002:
Communication with Cortex-M4: Linux fails to boot when RPMsg is enabled, the RPMSG driver hardcodes the location in memory used for RPMSG to be at the end of 1GB.
- Fixed in v4.1.15-phy-next branch: the following commits fix the RPMSG driver to support different memory sizes and add a device tree for booting FreeRTOS M4 in parallel with Linux on the Cortex-A7.
Note: RPMSG vring buffers must be modified for 256GB RAM in the M4 kernel as well. For the FreeRTOS NXP release, this is done by changing VRING0_BASE and VRING1_BASE in middleware/multicore/open-amp/porting/imx7d_m4/platform_info.c:
Code Block #define VRING0_BASE 0x8FFF0000 #define VRING1_BASE 0x8FFF8000
- 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.
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