I've just built the hardknott branch and the kernel is not bootable on my SABRE-based platform. I was digging a little bit the linux-fslc/5.4-2.3.x-imx repo and found the commit which causes the problem:
845620ec5d3b MLK-24940 arm: imx: correctly check the return value of "of_get_mac_address"
The above commit strongly depends on the following one which is currently missing on the latest revision:
d01f449c008a of_net: add NVMEM support to of_get_mac_address
Is that issue is known to you and has other solution than reversing the 845620ec5d3b?
Thanks in advance for the interest,