[M] Change in coreboot[master]: mb/google/skyrim: Override SPI flash bus speed

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Jason Nien, Jon Murphy, Martin Roth, Tim Van Patten.

Hello build bot (Jenkins), Raul Rangel, Jason Nien, Jon Murphy, Martin Roth, Tim Van Patten,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/68116

to look at the new patch set (#2).

Change subject: mb/google/skyrim: Override SPI flash bus speed
......................................................................

mb/google/skyrim: Override SPI flash bus speed

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 
Change-Id: I5e8db22151fbc2db1f9e81b3644338348160736d
---
M src/mainboard/google/skyrim/Kconfig
M src/mainboard/google/skyrim/Makefile.inc
A src/mainboard/google/skyrim/spi_speeds.c
3 files changed, 84 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/16/68116/2