FP4 stock rebuilt kernel doesn't boot

Help Fairphone 4
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Hi Fairphone,

Thanks for the fantastic product!

I’ve tried rebuilding the stock kernel from sources, following the instructions here: Fairphone 4 Kernel Source Code — FAIRPHONE open source documentation.

The build goes fine, I then repackage the new kernel within the matching B.048 image and am trying to boot that.
Unfortunately, the boot hangs… Did anybody try rebuilding the kernel?

I’ve soldered wires to the UART pins (SM_DBG_UART_RX/TX) and am observing the log output, however it stops after ‘early boot’ for the ‘production kernel’ and even earlier for the rebuilt one.
What is the way to enable full debug UART output on the FP4? I tried modifying the cmdline parameters, but to no avail…

Thanks in advance for any pointers!

Best regards,
Kuba

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