Clock discovery on Broadcom / CFE systems

[Bruce M Simpson]

My research on hardware support for FreeBSD/mips continues.

It looks like the CFE firmware does not permit for the discovery of 
system clocks in the same way that YAMON does.

The Broadcom Sentry5 board support package for Linux uses a combination 
of hardcoded clock lines and probing of the MMIO registers in the Sonics 
SiliconBackplane.

David Young tells me that he's had a Google SoC student as of last year 
looking into getting the SiliconBackplane stuff to work with NetBSD, but 
that this work is unfinished. This work is available at:

Digging further into those files reveals the following resource:
    http://bcm-specs.sipsolutions.net/

Having glanced briefly at the Linux BSP I would suggest the best course 
of action may be to write our own FreeBSD Newbus BSP for the Sentry5.

Doing this work would enable FreeBSD/mips to support the Linksys WRT54G, 
Netgear WGT634U and other Broadcom Sentry5 based consumer hardware.

Regards,
BMS