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The -S flag of me_cleaner, in addition to the standard code removal, sets the the AltMeDisable bit (ME 6.x-10.x) or the HAP bit (ME 11.x), which asks Intel ME to stop the execution after the hardware initialization. This should bring some advantages: * The state of Intel ME can be easily obtained by reading the Current Operation Mode register to trigger specific adjustments in the raminit (as already done in bd82x6x) * Intel ME falls into a more defined state, instead of being in a generic "Image Failure" * Hopefully, less code is run by Intel ME, as the execution should stop before even trying to load additional modules Tested on: * Nehalem, Sandy Bridge and Ivy Bridge (Nicola Corna) * Broadwell, Skylake and Kabylake (Youness Alaoui) If needed, the -S flag can be removed or integrated with other board-specific options by overriding CONFIG_ME_CLEANER_ARGS. Change-Id: I2c12d09124dcc39924d1dc4eaf53a2dc1f69a2ac Signed-off-by: Nicola Corna <nicola@corna.info> Reviewed-on: https://review.coreboot.org/25508 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Youness Alaoui <snifikino@gmail.com>
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