Re: cvs commit: src/sys/bus/usb usb.c

[Michael Neumann <mneumann@xxxxxxxx>]

Matthew Dillon wrote:
> :Isn't the BIOS on modern computers providing emulation of PS2 for USB
> :keyboards? I have to organize a USB keyboard and try that out myself.
> :If possible I'd like to have a clean solution. Right now, even delaying
> :configuration until after interrupts are available seems to be a hack to
> :me, at least doing it manually. Maybe something like NetBSD's autoconf
> :framework would be a cleaner solution.
> :
> :Regards,
> :
> :   Michael
>
>     Some BIOSes do do this, using SMM to emulate the PS2 port.  It has
>     always been a bit hokey because the emulation doesn't always mesh
>     properly when the kernel tries to switch over to the USB keyboard.
>     Personally speaking I would rather not depend on such a feature.

I added a tunable "hw.usb.hack_defer_exploration" which reverts to the
old USB behaviour when set to 0 (defaults to 1).

http://www.dragonflybsd.org/cvsweb/src/sys/bus/usb/usb.c.diff?r1=1.48&r2=1.49&f=u

It is considered a hack to not introduce any further regessions before
the 2.0 release. For the post 2.0 release, I am investigating in porting
the USB4BSD stack [1] to DragonFly which seems to be more mature, much
better documented and much cleaner (and MP safe). Depending on when the
2.0 will be see it's light, I could of course try to get it done for 2.0.

Regards,

  Michael

[1]: http://leaf.dragonflybsd.org/mailarchive/users/2008-01/msg00063.html