RPi3 usb boot hang on stable/13

From: bob prohaska <fbsd_at_www.zefox.net>
Date: Sat, 02 Jul 2022 16:58:00 UTC 
Lately an RPi3 running stable/13 has started hanging on boot from USB
The disk is on a powered hub.

When gracefully rebooted it ends with:

.....
MESS:00:00:03.166523:0: Device tree loaded to 0x4000 (size 0x63cd)
MESS:00:00:03.172180:0: uart: Set PL011 baud rate to 103448.300000 Hz
MESS:00:00:03.178716:0: uart: Baud rate change done...
MESS:00:00:03.182145:0: uart: Baud rate change done...
MESS:00:00:03.187830:0: gpioman: gpioman_get_pin_num: pin SDCARD_CONTROL_POWER not defined
MMC:   mmc@7e300000: 1
Loading Environment from FAT... OK
In:    serial
Out:   vidconsole
Err:   vidconsole
Net:   No ethernet found.
starting USB...
Bus usb@7e980000: scanning bus usb@7e980000 for devices... 6 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
Hit any key to stop autoboot:  0 

Device 0: 

At that point the console is unresponsive. 

The machine has a history of not always finding the USB disk, but this
appears to be new behavior. As with the disk discovery problem, the
error can be worked around by simple repetition. Once booted it's 
stable but network response remains erratic.

There's some indication that power-cycling the hard disk helps.

At the moment uname -a reports

FreeBSD pelorus.zefox.org 13.1-STABLE FreeBSD 13.1-STABLE #5 stable/13-n251597-7c500f98b8d: Fri Jul  1 21:52:12 PDT 2022     bob@pelorus.zefox.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC arm64

Thanks for reading,

bob prohaska