diff options
Diffstat (limited to 'src/soc/intel/common/block/include/intelblocks/cse.h')
| -rw-r--r-- | src/soc/intel/common/block/include/intelblocks/cse.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/cse.h b/src/soc/intel/common/block/include/intelblocks/cse.h index 93d1ce1d04..595c7d8d6b 100644 --- a/src/soc/intel/common/block/include/intelblocks/cse.h +++ b/src/soc/intel/common/block/include/intelblocks/cse.h @@ -136,8 +136,20 @@ enum rst_req_type { int cse_request_global_reset(enum rst_req_type rst_type); /* - * Send HMRFPO_ENABLE command. - * returns 0 on failure and 1 on success. + * 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 + * 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 + * the CSE region to perform updates to it. + * This command is only valid before EOP. + * + * Returns 0 on failure to send HECI command and to enable HMRFPO mode, and 1 on success. + * */ int cse_hmrfpo_enable(void); |