[arm-allstar] Hamvoip on CM4 Compute Module

[Dave]

I have been attempting to run v1.6 on the new Pi4 version of the neat 
little compute module mounted on the official CM4-IO board. I like this 
physical configuration because all the connectors including the SD card 
are mounted along one edge of the PCB, making a proper metal rack mount 
controller much easier to construct. The I/O board also has an on-board 
RTC and POE, along with full size HDMI ports instead of the fiddly 
micro-HDMI's on a PI4.

The first issue is that the compute module, like the newest Pi4 and 
Pi400 keyboard models, supports USB boot by default. Apparently this 
configuration does not like the standard boot loader. It refused to boot 
on either a CM4-Lite using the usual uSD card, or a CM4 with a eMMC 
module flashed with the stock distro. I temporarily solved the boot 
problem by downloading the latest Arch RasPi image, copying the contents 
of the boot partition, and over-writing the standard start.elf and the 
other boot files. It boots now and is running the latest kernel7. I'm 
going to investigate this more to narrow the cause, but for now it boots.

The second problem is proving more elusive. On the CM4-IO board, the USB 
hub and ports are disabled by default to save power.  The documentation 
explains this and recommends adding the command " 
dtoverlay=dwc2,dr_mode=host" to the config.txt to enable the USB. This 
seems to work properly in Raspbian, but not in Arch. I suspect (?) the 
problem is in one or more of the overlay files in the /boot directly not 
supporting the new hardware. The ports stay powered down, and issuing a 
lsusb -t command shows no USB hub or devices.

I'm not sure exactly how to approach this issue.  Not much info out 
there yet on these new boards. Anyone have suggestions?

Dave, K7DMK