That’s truly amazing! So the FSP + coreboot part only takes a quarter of a second? Intel
FSP must be on steroids!!
The total boot time is the sum of components time, so if you fix that problem you will
have close to a quarter of second boot time!! Can we see a video clip of that boot?
27 apr 2015 kl. 22:42 skrev Duncan Laurie
On Mon, Apr 27, 2015 at 12:29 PM, Matt DeVillier <matt.devillier(a)gmail.com
On 4/26/2015 3:03 AM, Paul Menzel wrote:
Dear coreboot folks,
looking at the time stamps of the Intel Haswell device Google Panther,
which Matt DeVillier thankfully uploaded to the board status repository
, it looks odd that it took around a quarter of a second, from after
the SeaBIOS payload was decompressed to starting the payload. This is
almost half of the whole boot time.
90:load payload 233,302 (216)
15:starting LZMA decompress (ignore for x86) 233,415 (113)
16:finished LZMA decompress (ignore for x86) 250,327 (16,912)
99:selfboot jump 493,712 (243,384)
Thanks to Aaron Durbin’s analysis of the code path, the finalize in line
138 of `src/southbridge/intel/lynxpoint/smi.c` calls
`intel_me_mbp_clear()` in line 589 of
$ more src/southbridge/intel/lynxpoint/me_9.x.c # line 589
/* Wait for ME MBP Cleared indicator */
The issue is even described in the Kconfig option description of
`ME_MBP_CLEAR_LATE` and the commit message of commit 3d299c4b (lynxpoint
me: add support for mbp clear wait in finalize step)  adding this
$ more src/southbridge/intel/lynxpoint/Kconfig
bool "Defer wait for ME MBP Cleared"
If you set this option to y, the Management Engine driver
will defer waiting for the MBP Cleared indicator until the
finalize step. This can speed up boot time if the ME takes
a long time to indicate this status.
I guess there is no way to get fixed ME BLOBs from Intel. I heard the ME
BLOB has been fixed for newer Intel devices.
The ME firmware that ships with Panther is 18.104.22.1686. I've also tested 22.214.171.1244
(what I'm using in the firmware referenced above) and 126.96.36.1992 (which I just came
across today) - all display the same behavior in terms of time needed to report MBP
cleared. The 9.6 series ME firmware is also for Haswell/Lynxpoint, but I'm unsure if
it's compatible with systems shipped with ME 9.5. Since I have an external
programmer, I suppose I could always give it a try :) The 10.0 series ME firmware is for
Broadwell and is more likely to contain the fix, but less likely to be compatible with
Unfortunately the wait for ME MBP to clear is even worse on Broadwell, but with ME10
there is a (gross) boot flow to avoid it thanks to some new commands that do not need
coreboot mailing list: coreboot(a)coreboot.org <mailto:email@example.com>
coreboot mailing list: coreboot(a)coreboot.org