Landon J. Fuller
e15461c7e9
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
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