coreboot.git - my copy of coreboot

Age	Commit message (Collapse)	Author
2021-02-07	sb/intel/bd82x6x: Support ME Soft Temporary Disable Mode	Evgeny Zinoviev
	- Add support for ME Soft Temporary Disable Mode. In this mode, ME doesn't load its kernel and freezes at Bring UP (BUP) phase. This mode is saved in ME NVRAM (and thus will remain for next reboots and poweroffs). - Add support of new CMOS option for Sandy Bridge and Ivy Bridge ThinkPads. HOW TO USE To disable ME: 1. nvramtool -w me_state=Disabled 2. reboot To enable it back: 1. nvramtool -w me_state=Normal 2. reboot To check current status: intelmetool -m Tested on ThinkPad X230 and ThinkPad X220. BACKGROUND There's no Intel documentation that would explain how this should be implemented, in public. Working binary sequence for MKHI command to put ME in Soft Temporary Disable Mode, as well as a way to bring ME out of it (by writing to H_GS register), was found and published by researchers from PT Security: 1. To disable ME, BIOS issues the disable command (before End of Post) and reboots. ME is supposed to be disabled on the next boot after DID (DRAM Init Done). My numerous tests show that issuing the command and rebooting is not enough. If we reboot too early, ME will not be disabled. Apparently, it is doing something in background after receiving the command. It works with a delay of 500-1000 ms. I also tried to dump all known (documented) registers, such as GMES and HFS, before and during the next 2 seconds after execution of the disable command to find a possible indication that something's changed in ME and we're ready to reboot. Found nothing unfortunately. 2. To enable ME back, host writes value 0x20000000 to H_GS. PT slides don't contain any more information on it, but my tests show, that after writing this value, GMES[31:28] is changing from 0x01 (BUP phase) to 0x03 (Policy Module) to 0x06 (Host Communication). Then, after some more time, fw_init_complete bit of HFS becomes 1. This means that ME starts loading its kernel immediately, without reboot. On the other hand, Lenovo BIOS clearly perform a reboot after enabling it (one reboot after saving the settings, then ThinkPad logo appears, and then one more reboot). I'm assuming we have to reset too. Change-Id: Ic01526c9731cbef4e8552bbc352133a2415787c2 Signed-off-by: Evgeny Zinoviev <me@ch1p.io> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37115 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Nico Huber <nico.h@gmx.de>
2018-08-15	mb///cmos.default: Decrease debug_level to 'Debug'	Elyes HAOUAS
	Used default console log level is 7 in src/console/Kconfig. So let cmos.default use the same level as default. Change-Id: Ia39ee457a8985142f6e7a674532995b11cb52198 Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/28006 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tristan Corrick <tristan@corrick.kiwi> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Martin Roth <martinroth@google.com>
2017-07-24	mb/lenovo/t430: Disable `usb_always_on` by default in CMOS	Patrick Rudolph
	Fix regression introduced by commit 7ffb329f. The default value for usb_always_on is no longer sane and is replaced by the same default that is used on all other boards (disabled). Change-Id: Ia8854a8491bc56507d01e08e1ca1e195a1d62bfc Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/20575 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Martin Roth <martinroth@google.com>
2017-05-19	mainboard/lenovo/t430: Add Thinkpad T430 support	Philipp Deppenwiese
	Tested and working: * HDD LED * Booting GNU Linux 4.9 from HDD using SeaBios * Booting GNU Linux 4.9 from USB using SeaBios * Native GFX init * All Fn function keys * Speakers * PCIe Wifi * Camera * WWAN * Fan (Dynamic Thermal Managment) * Flashing using internal programmer * Dual memory DIMMs running at up to DDR3-1866 * AC events * Touchpad, trackball and keyboard * USB3 ports running at SuperSpeed * Ethernet * Headphone jack * Speaker mute * Microphone mute * Volume keys * Fingerprint sensor * Lid switch * Thinklight * TPM (disable SeaBios CONFIG_TCGBIOS) * CMOS options: power_on_after_fail reboot_counter boot_option gfx_uma_size ** usb_always_on Untested: * Booting Windows * Hybrid graphics * Docking station * VGA Broken: * Wifi LED is always on Change-Id: I5403cfb80a57753e873c570d95ca535cf5f45630 Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org> Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/18011 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nico Huber <nico.h@gmx.de>