update information about HMRFPO

4 years ago · e0ef320024
parent 8748274dbe
commit e0ef320024
1 changed files with 3 additions and 3 deletions
--- a/README.md
+++ b/README.md
@ -348,9 +348,9 @@ As an alternative, you can use Software Temporary Disable Mode. This is ME's bui

 Some possible future solutions are described below.

-#### HMRFPO (not implemented)
+#### HMRFPO (won't work)

-Researchers from PT Security discovered a special MKHI command called HMRFPO (Host ME Region Flash Protection Override) that was used in some vendor BIOSes (apparently, for ME firmware updates). BIOS sends this command before End of Post (binary sequence of the command is `0x800c0007 0x00000105 0x00000000 0x00000000`). It takes effect for the next reboot and ME region on SPI flash becomes writable. Unfortunately I couldn't reproduce it on X230 (ME 8.1.1416.40).
+**HMRFPO** (Host ME Region Flash Protection Override) is a command BIOS can use to unlock ME region on SPI flash for writing. Vendor can disable it during manufacturing. Unfortunately it's disabled on ThinkPads and can't be used.

 #### HDA_SDO (not implemented)