ipq806x: Load TZBSP blob from coreboot ramstage

Read the TZBSP blob from CBFS and run it. A side effect of the blob
execution is switching the processor into User mode.

Starting TZBSP requires processor running in Supervisor mode, TZBSP
code is compiled for ARM. Coreboot is executing in System mode and is
compiled for Thumb. An assembler wrapper switches the execution mode
and interfaces between Thumb and ARM modes.

  With the preceeding patches the system successfully loads to
  depthcharge in recovery mode.

Change-Id: I812b5cef95ba5562a005e005162d6391e502ecf8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 7065cf3d17964a1d9038ec8906b469a08a79c6e2
Original-Change-Id: Ib14dbcbcbe489b595f4247d489d50f76a0e65948
Original-Signed-off-by: Varadarajan Narayanan <varada@qti.qualcomm.com>
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/229026
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9690
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
6 files changed