- EC Lib

This wraps Blizzard driverlib and implements the EC chip interface defined
by Google. See below diagram for architecture.


  +--------------------+
  |   Host BIOS/OS     |
  +--------------------+

 ---- host interface ----

  +--------------------+
  | Google EC features |
  +--------------------+

 ---- chip interface ----  The interface is defined in
                           src/platform/ec/chip_interface/*.
  +--------------------+   But the real implementation is in EC Lib.
  |       EC Lib       |
  +--------------------+
  | Blizzard low level |
  |   driver, the      |
  |   driverlib.       |
  +--------------------+


Build Options
=============

- CONFIG_WATCHDOG_HELP

	Try to detect a watchdog that is about to fire, and print a trace.
	This is needed on STM32, where the independent watchdog has no early
	warning feature and the windowed watchdog has a very short period.

- CONFIG_PANIC_NEW_STACK

	When reporting a panic, change to a completely new stack. This might
	help get a useful trace out a situation where the stack or stack
	pointer has been corrupted.

- CONFIG_PANIC_HELP

	Report extra information about a panic, such as the fault address,
	here shown as bfar. This shows the reason for the fault and may help
	to determine the cause.

	=== EXCEPTION: 03 ====== xPSR: 01000000 ===========
	r0 :0000000b r1 :00000047 r2 :60000000 r3 :200013dd
	r4 :00000000 r5 :080053f4 r6 :200013d0 r7 :00000002
	r8 :00000000 r9 :200013de r10:00000000 r11:00000000
	r12:00000000 sp :200009a0 lr :08002b85 pc :08003a8a
	Precise data bus error, Forced hard fault, Vector catch, bfar = 60000000
	mmfs = 00008200, shcsr = 00000000, hfsr = 40000000, dfsr = 00000008