[coreboot-gerrit] Change in coreboot[master]: [TESTONLY]nb/intel/x4x: Cache cbmem in romstage

[Paul Menzel (Code Review)]

Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37213 )

Change subject: [TESTONLY]nb/intel/x4x: Cache cbmem in romstage
......................................................................

Patch Set 7:

This on the ancestors

git fetch "https://review.coreboot.org/coreboot" refs/changes/13/37213/7 && git checkout FETCH_HEAD

correctly boot on the ASRock E350M1 (AMD Fusion, AGESA Family 14h)) and seem to save 9 ms according to the timestamps (but only did two boots comparing it to the results in the board status repository).

```
$ sudo cbmem -t
33 entries total:

0:1st timestamp                                     7,886
  11:start of bootblock                                13,453 (5,567)
  12:end of bootblock                                  14,770 (1,317)
  13:starting to load romstage                         15,380 (609)
  14:finished loading romstage                         15,462 (81)
   1:start of romstage                                 15,770 (308)
   2:before ram initialization                         127,956 (112,185)
   3:after ram initialization                          402,574 (274,617)
  17:starting LZ4 decompress (ignore for x86)          414,089 (11,515)
  18:finished LZ4 decompress (ignore for x86)          415,027 (937)
 100:start of postcar                                  416,485 (1,458)
 101:end of postcar                                    416,486 (0)
   8:starting to load ramstage                         416,596 (110)
  15:starting LZMA decompress (ignore for x86)         416,632 (36)
  16:finished LZMA decompress (ignore for x86)         507,218 (90,585)
   9:finished loading ramstage                         507,264 (46)
  10:start of ramstage                                 507,286 (21)
  30:device enumeration                                511,203 (3,917)
  40:device configuration                              649,123 (137,920)
  50:device enable                                     662,052 (12,928)
  60:device initialization                             662,521 (468)
  65:Option ROM initialization                         676,528 (14,007)
  66:Option ROM copy done                              708,377 (31,849)
  67:Option ROM run done                               750,088 (41,710)
  70:device setup done                                 750,532 (443)
  75:cbmem post                                        1,000,542 (250,010)
  80:write tables                                      1,000,543 (1)
  85:finalize chips                                    1,007,883 (7,340)
  90:load payload                                      1,007,888 (4)
  15:starting LZMA decompress (ignore for x86)         1,008,407 (519)
  16:finished LZMA decompress (ignore for x86)         1,034,267 (25,860)
  15:starting LZMA decompress (ignore for x86)         1,034,338 (70)
  16:finished LZMA decompress (ignore for x86)         1,116,042 (81,703)
  99:selfboot jump                                     1,116,134 (92)

Total Time: 1,108,233
```