diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/mysteries_intel.txt | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/Documentation/mysteries_intel.txt b/Documentation/mysteries_intel.txt index 55921cf..10cb37d 100644 --- a/Documentation/mysteries_intel.txt +++ b/Documentation/mysteries_intel.txt @@ -14,10 +14,18 @@ when trying to touch an address outside of any region. See also http://www.flashrom.org/pipermail/flashrom/2011-August/007606.html -= Unlocking the ME region = += (Un)locking the ME region = If the ME region is locked by the FRAP register in descriptor mode, the host - software is not allowed to read or write any address inside that region. There - are different ways to unlock access: + software is not allowed to read or write any address inside that region. + Although the chipset datasheets specify that "[t]he contents of this register + are that of the Flash Descriptor" [PANTHER], this is not entirely true. + The firmware has to fill at least some of the registers involved. It is not + known when they become read-only or any other details, but there is at least + one HM67-based board, that provides an user-changeable setting in the firmware + user interface to enable ME region updates that lead to a FRAP content that is + not equal to the descriptor region bits [NC9B]. + + There are different ways to unlock access: - A pin strap: Flash Descriptor Security Override Strap (as indicated by the Flash Descriptor Override Pin Strap Status (FDOPSS) in HSFS. That pin is @@ -81,6 +89,11 @@ vendor tools use it for updates. This needs to be investigated further before drawing any conclusion. +[PANTHER] Intel 7 Series Chipset Family Platform Controller Hub (PCH) Datasheet + Document Number: 326776, April 2012, page 857 +[NC9B] Jetway NC9B flashrom v0.9.5.2-r1517 log with ME region unlocked. + NB: "FRAP 0e0f" vs. "FLMSTR1 0a0b". + http://paste.flashrom.org/view.php?id=1215 [MODE_CTRL] Client Platform Enabling Tour: Platform Software Document Number: 439167, Revision 1.2, page 52 [MEBX] Intel Management Engine BIOS Extension (MEBX) User's Guide |
