K 10
svn:author
V 7
landonf
K 8
svn:date
V 27
2016-08-17T20:24:14.513839Z
K 7
svn:log
V 752
mips/broadcom: Implement CFE-based EARLY_PRINTF support.

This adds support for EARLY_PRINTF via the CFE console; the aim is to
provide a fix for the otherwise cyclic dependency between PMU discovery
and console printf/DELAY:

- We need to parse the bhnd(4) core table to determine the address (and
  type) of the PMU/PLL registers and calculate the CPU clock frequency.
- The core table parsing code will emit a printf() if a parse error is
  hit.
- Safely calling printf() without EARLY_PRINTF requires a working
  DELAY+cninit, which means we need the PMU.

Errors in core table parsing shouldn't happen, but lack of EARLY_PRINTF
makes debugging more difficult.

Approved by:	adrian (mentor)
Differential Revision:	https://reviews.freebsd.org/D7498

END