CSE RW blob which will be used by coreboot to update CSE's RW partition,
is packed part of FW_MAIN_A and FW_MAIN_B. This will increase the size of
FW_MAIN_A and FW_MAIN_B. So, accordingly load and hash calculation of
FW_MAIN_A (or FW_MAIN_B) increases during verstage. It increases the boot
time by around 300ms.
The patch address the boot time by pulling CSE RW blob outside of
FW_MAIN_A and FW_MAIN_B. So, it creates new FMAP region within
RW_SECTION_A and RW_SECTION_B and adds CSE RW blob in the new regions
(ME_RW_A and ME_RW_B) as a CBFS file.
Boot Time Measurement details when CSE RW blob is added in the
ME_RW_A and ME_RW_B.
--------------------------------------------------------
| Platform | Old Boot Time | New Boot Time |
--------------------------------------------------------
| JSL | 1.3s | 1.06s |
--------------------------------------------------------
| TGL | 1.63s | 1.36s |
--------------------------------------------------------
Changes:
1. Makefile change to accommodate CSE RW blob into ME_RW_A/ME_RW_B
2. Kconfig change to define CBFS name and default file name for RW blob
metadata.
3. CSE Lite Driver
BUG=b:169077783
TEST=Verified on JSL & TGL platforms
Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Change-Id: If043c9cb99fb822b62633591bf9c5bd75dfe8349
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46312
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
361e364635