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On certain mainboards due to hardware design limitations, certain SPI
Read Modes eg. (Dual I/O 1-2-2) cannot be supported. Add ability to
override SPI read modes in boards which do not have hardware
limitations. Currently there is an API to override SPI fast speeds.
Update this API for mainboards to override SPI read mode as well.
BUG=b:225213679
TEST=Build and boot to OS in Skyrim. Observe a boot time improvement of
~25 ms with 100 MHz SPI speeds.
Before:
11:start of bootblock 688,046
14:finished loading romstage 30,865
16:FSP-M finished LZMA decompress (ignore for x86) 91,049
Total Time: 1,972,625
After:
11:start of bootblock 667,642
14:finished loading romstage 29,798
16:FSP-M finished LZMA decompress (ignore for x86) 87,743
Total Time: 1,943,924
Change-Id: I160b56f6201a798ce59e977ca40301e23ab63805
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68946
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jon Murphy <jpmurphy@google.com>
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Add configuration to bump up the SPI flash bus speed from 66 MHz to 100
MHz starting the board version where required schematics update is done.
BUG=b:245949155
TEST=Build and boot to OS in Skyrim with 100 MHz SPI bus speed. Perform
warm and cold reboot cycles for 100 iterations each. Observe that the
boot time improved by ~115 ms compared to 66 MHz SPI flash bus speed.
At 66 MHz:
508:finished loading body 538,319 (83,806)
11:start of bootblock 1,196,809 (624,777)
14:finished loading romstage 1,236,905 (39,163)
970:loading FSP-M 1,237,056 (37)
15:starting LZMA decompress (ignore for x86) 1,237,073 (17)
16:finished LZMA decompress (ignore for x86) 1,358,937 (121,864)
8:starting to load ramstage 2,010,304 (0)
15:starting LZMA decompress (ignore for x86) 2,010,312 (8)
16:finished LZMA decompress (ignore for x86) 2,067,181 (56,869)
971:loading FSP-S 2,078,232 (7,999)
17:starting LZ4 decompress (ignore for x86) 2,078,253 (21)
18:finished LZ4 decompress (ignore for x86) 2,084,297 (6,044)
90:starting to load payload 2,316,933 (5)
15:starting LZMA decompress (ignore for x86) 2,316,947 (14)
16:finished LZMA decompress (ignore for x86) 2,339,819 (22,872)
Total Time: 2,464,338
At 100 MHz:
508:finished loading body 515,118 (59,364)
11:start of bootblock 1,115,043 (566,110)
14:finished loading romstage 1,146,713 (29,697)
970:loading FSP-M 1,146,865 (38)
15:starting LZMA decompress (ignore for x86) 1,146,881 (16)
16:finished LZMA decompress (ignore for x86) 1,249,351 (102,470)
8:starting to load ramstage 1,900,568 (1)
15:starting LZMA decompress (ignore for x86) 1,900,576 (8)
16:finished LZMA decompress (ignore for x86) 1,956,337 (55,761)
971:loading FSP-S 1,967,357 (7,930)
17:starting LZ4 decompress (ignore for x86) 1,967,377 (20)
18:finished LZ4 decompress (ignore for x86) 1,972,925 (5,548)
90:starting to load payload 2,205,300 (6)
15:starting LZMA decompress (ignore for x86) 2,205,313 (13)
16:finished LZMA decompress (ignore for x86) 2,227,087 (21,774)
Total Time: 2,349,804
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Change-Id: I5e8db22151fbc2db1f9e81b3644338348160736d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68116
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jon Murphy <jpmurphy@google.com>
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