[Bug 258057] muge(4) crashes with large tx batches

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 29 Sep 2021 17:17:12 UTC

--- Comment #28 from Dan Kotowski <dan.kotowski@a9development.com> ---
usbconfig -d 1.9 dump_curr_config_desc:

Also worth noting is that the ACTUAL controller in the SOC is a Synopsys
DesignWare Core SuperSpeed:

Sure enough the 2 Known Limitations are OUT Transfer Size and TRB Ring Size.
I'm not sure if that's necessarily related, but the device only seems to fail
under large TX, not RX.

A few other notes:

1. ugen0.1 refuses to come up to superspeed, even under Linux - this may just
be an issue with early revision boards. I intend to avoid using this bus
entirely for now.

2. I was able to get the bus and devices up to superspeed hanging off of
ugen1.1 under Linux _sometimes_ but only once I disabled powersaving on

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