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soc/intel: Correct comment on HMRFPO_ENABLE HECI command 

Correct comment on HMRFPO_ENABLE flow for CSE Lite SKU. In order to place
CSE into SECOVER_MEI_MSG mode, below procedure has to be followed.
1. Ensure CSE boots from RO(BP1).
	- Set CSE's next boot partition to RO
	- Issue GLOBAL_RESET HECI command to reset the system
2. Send HMRFPO_ENABLE command to CSE. Further, no reset is required.

TEST=Verified on hatch

Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Change-Id: I213e02ba3898194fa6c8fe38fab34b5c19f25aa1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41340
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Sridhar Siricilla 2020-05-12 21:28:53 +05:30 committed by Subrata Banik
parent 9e8dd06cd4
commit 6ad7010542
1 changed files with 4 additions and 4 deletions
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8
src/soc/intel/common/block/include/intelblocks/cse.h
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@ -130,10 +130,10 @@ int cse_request_global_reset(enum rst_req_type rst_type);
/*
* Sends HMRFPO_ENABLE command.
* HMRFPO - Host ME Region Flash Protection Override.
* For CSE Firmware SKU Custom, procedure to place CSE in HMRFPO (SECOVER_MEI_MSG) mode:
* 1. Ensure CSE boots from BP1(RO).
* - Send set_next_boot_partition(BP1)
* - Issue CSE Only Reset
* For CSE Lite SKU, procedure to place CSE in HMRFPO (SECOVER_MEI_MSG) mode:
* 1. Ensure CSE boots from RO(BP1).
* - Set CSE's next boot partition to RO
* - Issue GLOBAL_RESET command to reset the system
* 2. Send HMRFPO_ENABLE command to CSE. Further, no reset is required.
*
* The HMRFPO mode prevents CSE to execute SPI I/O cycles to CSE region, and unlocks