DWC OTG TX path optimisation for 11-current

[bob prohaska]

On Mon, Oct 05, 2015 at 12:51:08AM +0200, Andreas Schwarz wrote:
> On 25.09.15, Andreas Schwarz wrote:
> 
> With this patch my RPI2 is stable like hell. I've completed 10 buildworld
> runs (with -4) in series, without any issues. Please commit, if not done yet.
> 
> 
> root at pizelot:~ # uname -a
> FreeBSD pizelot.schwarzes.net 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r288200M: Fri Sep 25 08:35:44 CEST 2015
> root at pizelot.schwarzes.net:/usr/obj/usr/src/sys/RPI2-B-ASC  arm
> 
> 
> -asc

My observations are much the same. Crashes during OS build/install seem to
have stopped entirely. One can arrange to crash the system using stress2,
but that might be considered unsporting 8-). Curiously, the smsc0 warnings,
eliminated during OS builds, still appear from time to time using stress2.

A collection of crashes can be found at www.zefox.net/~fbsd/rpi2/crashes
on the chance they might be of some use.

bob prohaska