[coreboot] What purpose the "mrc.cache"?

[김유석 책임연구원]

Dear Sir.


My ENV.

   Platform : intel atom rangeley mohon peak CRB(C2358)


This time, I'm try to study for MRC(Memory Reference Code).


But, I'm can not found a some example code on coreboot source tree.(rangely)


Anyway, I'm get a some hint on last image.


Performing operation on 'COREBOOT' region...
Name                           Offset     Type         Size
cbfs master header             0x0        cbfs header  32
fallback/romstage              0x80       stage        24356
config                         0x6040     raw          440
revision                       0x6240     raw          567
cmos_layout.bin                0x64c0     cmos_layout  1316
fallback/dsdt.aml              0x6a40     raw          8074
payload_config                 0x8a40     raw          1574
payload_revision               0x90c0     raw          244
(empty)                        0x9200     null         27800
*mrc.cache                  0xfec0 mrc_cache  65536*
cpu_microcode_blob.bin         0x1ff00    microcode    167936
fallback/ramstage              0x48f80    stage        48170
fallback/payload               0x54c00    payload      61309
(empty)                        0x63bc0    null         1163992
fsp.bin                        0x17fec0   fsp          389120
(empty)                        0x1def00   null         133528
bootblock                      0x1ff8c0   bootblock    1528


*Question.*

  1. What purpose the "mrc.cache"?

  2. Where to location the source code for "mrc.cache" ?

  3. How modify the MRC ? for the sdram.


Thank you.




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