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Diffstat (limited to 'Documentation/mainboard/lenovo/Sandy_Bridge_series.md')
| -rw-r--r-- | Documentation/mainboard/lenovo/Sandy_Bridge_series.md | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/Documentation/mainboard/lenovo/Sandy_Bridge_series.md b/Documentation/mainboard/lenovo/Sandy_Bridge_series.md index 0b833f5cc8..dbbbbeef30 100644 --- a/Documentation/mainboard/lenovo/Sandy_Bridge_series.md +++ b/Documentation/mainboard/lenovo/Sandy_Bridge_series.md @@ -33,9 +33,7 @@ usable by coreboot. * ROM chip size should be set to 8MiB. -```eval_rst -Please also have a look at :doc:`../../flash_tutorial/index`. -``` +Please also have a look at the [flashing tutorial] ## Flash layout There's one 8MiB flash which contains IFD, GBE, ME and BIOS regions. @@ -46,3 +44,26 @@ region. The update is then written into the EC once. [fl]: flashlayout_Sandy_Bridge.svg +## Reducing Intel Managment Engine firmware size + +It is possible to reduce the Intel ME firmware size to free additional +space for the `bios` region. This is usually refered to as *cleaning the ME* or +*stripping the ME*. +After reducing the Intel ME firmware size you must modify the original IFD +and then write a full ROM using an [external programmer]. +Have a look at the [me_cleaner] for more information. + +Tests on Lenovo X220 showed no issues with a stripped ME firmware. + +**Modified flash layout:** + +![][fl2] + +[fl2]: flashlayout_Sandy_Bridge_stripped_me.svg + +The overall size of the `gbe`, `me,` `ifd` region is less than 128KiB, leaving +the remaining space for the `bios` partition. + + +[me_cleaner]: ../../northbridge/intel/sandybridge/me_cleaner.md +[external programmer]: ../../flash_tutorial/index.md |