04d2601426
Recent patches in coreboot have fixed the freeze issues related to the
use of me_cleaner on Nehalem.
However, at least on the Lenovo X201, with me_cleaner some PCIe devices
(like the SATA and USB controllers) disappear. In particular, setting
the AltMeDisable bit ("-S" or "-s" flag) makes them disappear
completely, while unsetting it makes them disappear only during cold
boots.
This kind of behaviour was already observed by Youness Alaoui on the
Purism Librem laptops ([1]), and it seems related to some required
board-specific PCIe configuration in the ME's MFS partition.
For this reason, on the Lenovo X201, "-w EFFS" has been added to the
me_cleaner arguments, which whitelists the MFS-equivalent partition for
ME generation 2. This fixes all the issues, and the PCIe devices work as
expected.
[1] https://puri.sm/posts/deep-dive-into-intel-me-disablement/
Change-Id: Ie77a80d2cb4945cf1c984bdb0fb1cc2f18e82ebc
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/27178
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
158 lines
5.0 KiB
Groff
158 lines
5.0 KiB
Groff
.TH me_cleaner 1 "JUNE 2018"
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.SH me_cleaner
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.PP
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me_cleaner \- Tool for partial deblobbing of Intel ME/TXE firmware images
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.SH SYNOPSIS
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.PP
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\fB\fCme_cleaner.py\fR [\-h] [\-v] [\-O output_file] [\-S | \-s] [\-r] [\-k]
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[\-w whitelist | \-b blacklist] [\-d] [\-t] [\-c] [\-D output_descriptor]
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[\-M output_me_image] \fIfile\fP
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.SH DESCRIPTION
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.PP
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\fB\fCme_cleaner\fR is a tool able to disable parts of Intel ME/TXE by:
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.RS
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.IP \(bu 2
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removing most of the code from its firmware
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.IP \(bu 2
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setting a special bit to force it to disable itself after the hardware
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initialization
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.RE
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.PP
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Using both the modes seems to be the most reliable way on many platforms.
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.PP
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The resulting modified firmware needs to be flashed (in most of the cases) with
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an external programmer, often a dedicated SPI programmer or a Linux board with
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a SPI master interface.
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.PP
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\fB\fCme_cleaner\fR works at least from Nehalem to Coffee Lake (for Intel ME) and on
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Braswell/Cherry Trail (for Intel TXE), but may work as well on newer or
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different architectures.
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.PP
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While \fB\fCme_cleaner\fR have been tested on a great number of platforms, fiddling
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with the Intel ME/TXE firmware is \fIvery dangerous\fP and can easily lead to a
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dead PC.
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.PP
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\fIYOU HAVE BEEN WARNED.\fP
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.SH POSITIONAL ARGUMENTS
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.TP
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\fB\fCfile\fR
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ME/TXE image or full dump.
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.SH OPTIONAL ARGUMENTS
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.TP
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\fB\fC\-h\fR, \fB\fC\-\-help\fR
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Show the help message and exit.
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.TP
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\fB\fC\-v\fR, \fB\fC\-\-version\fR
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Show program's version number and exit.
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.TP
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\fB\fC\-O\fR, \fB\fC\-\-output\fR
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Save the modified image in a separate file, instead of modifying the
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original file.
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.TP
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\fB\fC\-S\fR, \fB\fC\-\-soft\-disable\fR
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In addition to the usual operations on the ME/TXE firmware, set the
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MeAltDisable bit or the HAP bit to ask Intel ME/TXE to disable itself after
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the hardware initialization (requires a full dump).
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.TP
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\fB\fC\-s\fR, \fB\fC\-\-soft\-disable\-only\fR
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Instead of the usual operations on the ME/TXE firmware, just set the
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MeAltDisable bit or the HAP bit to ask Intel ME/TXE to disable itself after
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the hardware initialization (requires a full dump).
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.TP
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\fB\fC\-r\fR, \fB\fC\-\-relocate\fR
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Relocate the FTPR partition to the top of the ME region to save even more
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space.
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.TP
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\fB\fC\-t\fR, \fB\fC\-\-truncate\fR
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Truncate the empty part of the firmware (requires a separated ME/TXE image or
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\fB\fC\-\-extract\-me\fR).
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.TP
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\fB\fC\-k\fR, \fB\fC\-\-keep\-modules\fR
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Don't remove the FTPR modules, even when possible.
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.TP
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\fB\fC\-w\fR, \fB\fC\-\-whitelist\fR
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Comma separated list of additional partitions to keep in the final image.
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This can be used to specify the MFS partition for example, which stores PCIe
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and clock settings.
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.TP
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\fB\fC\-b\fR, \fB\fC\-\-blacklist\fR
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Comma separated list of partitions to remove from the image. This option
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overrides the default removal list.
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.TP
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\fB\fC\-d\fR, \fB\fC\-\-descriptor\fR
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Remove the ME/TXE Read/Write permissions to the other regions on the flash
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from the Intel Flash Descriptor (requires a full dump).
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.TP
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\fB\fC\-D\fR, \fB\fC\-\-extract\-descriptor\fR
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Extract the flash descriptor from a full dump; when used with \fB\fC\-\-truncate\fR
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save a descriptor with adjusted regions start and end.
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.TP
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\fB\fC\-M\fR, \fB\fC\-\-extract\-me\fR
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Extract the ME firmware from a full dump; when used with \fB\fC\-\-truncate\fR save a
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truncated ME/TXE image.
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.TP
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\fB\fC\-c\fR, \fB\fC\-\-check\fR
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Verify the integrity of the fundamental parts of the firmware and exit.
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.SH SUPPORTED PLATFORMS
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.PP
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Currently \fB\fCme_cleaner\fR has been tested on the following platforms:
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.TS
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allbox;
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cb cb cb cb
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c c c c
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c c c c
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c c c c
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c c c c
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c c c c
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c c c c
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c c c c
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c c c c
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.
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PCH CPU ME SKU
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Ibex Peak Nehalem/Westmere 6.0 Ignition
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Ibex Peak Nehalem/Westmere 6.x 1.5/5 MB
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Cougar Point Sandy Bridge 7.x 1.5/5 MB
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Panther Point Ivy Bridge 8.x 1.5/5 MB
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Lynx/Wildcat Point Haswell/Broadwell 9.x 1.5/5 MB
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Wildcat Point LP Broadwell Mobile 10.0 1.5/5 MB
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Sunrise Point Skylake/Kabylake 11.x CON/COR
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Union Point Kabylake 11.x CON/COR
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.TE
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.TS
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allbox;
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cb cb cb
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c c c
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.
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SoC TXE SKU
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Braswell/Cherry Trail 2.x 1.375 MB
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.TE
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.PP
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All the reports are available on the project's GitHub page \[la]https://github.com/corna/me_cleaner/issues/3\[ra]\&.
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.SH EXAMPLES
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.PP
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Check whether the provided image has a valid structure and signature:
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.IP
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\fB\fCme_cleaner.py \-c dumped_firmware.bin\fR
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.PP
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Remove most of the Intel ME firmware modules but don't set the HAP/AltMeDisable
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bit:
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.IP
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\fB\fCme_cleaner.py \-S \-O modified_me_firmware.bin dumped_firmware.bin\fR
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.PP
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Remove most of the Intel ME firmware modules and set the HAP/AltMeDisable bit,
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disable the Read/Write access of Intel ME to the other flash region, then
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relocate the code to the top of the image and truncate it, extracting a modified
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descriptor and ME image:
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.IP
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\fB\fCme_cleaner.py \-S \-r \-t \-d \-D ifd_shrinked.bin \-M me_shrinked.bin \-O modified_firmware.bin full_dumped_firmware.bin\fR
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.SH BUGS
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.PP
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Bugs should be reported on the project's GitHub page \[la]https://github.com/corna/me_cleaner\[ra]\&.
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.SH AUTHOR
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.PP
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Nicola Corna \[la]nicola@corna.info\[ra]
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.SH SEE ALSO
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.PP
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.BR flashrom (8),
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me_cleaner's Wiki \[la]https://github.com/corna/me_cleaner/wiki\[ra]
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