Patch Set 7:

On the ASRock E350M1:

4.12-374-g0013623b7c:

```
27 entries total:

   0:1st timestamp                                     7,931
  11:start of bootblock                                14,414 (6,482)
  12:end of bootblock                                  15,624 (1,210)
  13:starting to load romstage                         16,214 (589)
  14:finished loading romstage                         16,301 (87)
   1:start of romstage                                 16,605 (303)
   2:before ram initialization                         129,739 (113,134)
   3:after ram initialization                          411,357 (281,617)
   4:end of romstage                                   426,279 (14,921)
 100:start of postcar                                  426,418 (138)
 101:end of postcar                                    426,418 (0)
   8:starting to load ramstage                         426,528 (109)
  15:starting LZMA decompress (ignore for x86)         426,564 (36)
  16:finished LZMA decompress (ignore for x86)         518,200 (91,636)
   9:finished loading ramstage                         518,247 (46)
  10:start of ramstage                                 518,269 (21)
  30:device enumeration                                522,196 (3,926)
  40:device configuration                              659,462 (137,266)
  50:device enable                                     672,386 (12,924)
  60:device initialization                             672,859 (473)
  70:device setup done                                 687,333 (14,474)
  75:cbmem post                                        932,112 (244,778)
  80:write tables                                      932,113 (1)
  85:finalize chips                                    973,568 (41,454)
  90:load payload                                      973,572 (4)
  15:starting LZMA decompress (ignore for x86)         974,055 (483)
  16:finished LZMA decompress (ignore for x86)         1,027,445 (53,389)
  99:selfboot jump                                     1,027,502 (57)

Total Time: 1,019,558
````

Your change-set rebased on origin/master (`cpu/x86/cache.h` added for `clflush_supported()`):

```
28 entries total:

   0:1st timestamp                                     7,886
  11:start of bootblock                                13,556 (5,670)
  12:end of bootblock                                  14,705 (1,148)
  13:starting to load romstage                         15,285 (580)
  14:finished loading romstage                         15,371 (86)
   1:start of romstage                                 15,652 (280)
   2:before ram initialization                         129,582 (113,930)
   3:after ram initialization                          414,538 (284,955)
  17:starting LZ4 decompress (ignore for x86)          421,713 (7,175)
  18:finished LZ4 decompress (ignore for x86)          427,201 (5,487)
 100:start of postcar                                  428,672 (1,471)
 101:end of postcar                                    428,672 (0)
   8:starting to load ramstage                         428,783 (110)
  15:starting LZMA decompress (ignore for x86)         428,819 (36)
  16:finished LZMA decompress (ignore for x86)         520,412 (91,593)
   9:finished loading ramstage                         520,459 (46)
  10:start of ramstage                                 520,480 (21)
  30:device enumeration                                524,407 (3,927)
  40:device configuration                              661,704 (137,297)
  50:device enable                                     674,636 (12,931)
  60:device initialization                             675,105 (468)
  70:device setup done                                 689,625 (14,520)
  75:cbmem post                                        953,917 (264,291)
  80:write tables                                      953,918 (1)
  85:finalize chips                                    995,266 (41,348)
  90:load payload                                      995,271 (4)
  15:starting LZMA decompress (ignore for x86)         995,755 (483)
  16:finished LZMA decompress (ignore for x86)         1,049,208 (53,453)
  99:selfboot jump                                     1,049,265 (57)

Total Time: 1,041,368
```

Looks like this improves loading postcar stage with ~1ms. Thanks for testing.

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