Despite googling the heck out of this simple problem, I can't find 
anything...

Problem is:

[   34.358783]  remoteproc1: 4a338000.pru1 is available
[   34.358802]  remoteproc1: Note: remoteproc is still under development 
and considered experimental.
[   34.358811]  remoteproc1: THE BINARY FORMAT IS NOT YET FINALIZED, and 
backward compatibility isn't yet guaranteed.
[   34.359092]  remoteproc1: Direct firmware load for am335x-pru1-fw failed 
with error -2
[   34.359113]  remoteproc1: failed to load am335x-pru1-fw
[   34.371827] pru-rproc 4a338000.pru1: booting the PRU core manually
[   34.371857]  remoteproc1: powering up 4a338000.pru1
[   34.371968]  remoteproc1: Direct firmware load for am335x-pru1-fw failed 
with error -2
[   34.371985]  remoteproc1: request_firmware failed: -2
[   34.377200] pru-rproc 4a338000.pru1: rproc_boot failed
[   34.493128]  remoteproc1: releasing 4a338000.pru1
[   34.493310] pru-rproc: probe of 4a338000.pru1 failed with error -2

The firmware file is present, it works - I just have to load it manually 
once I've booted with:

sudo rmmod -f pru_rproc
sudo modprobe pru_rproc

Is there a known issue with enabling the PRU's at boot?

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