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authorChristian Franke <nobody@nowhere.ws>2016-03-08 00:00:23 +0100
committerChristian Franke <nobody@nowhere.ws>2016-03-08 00:00:23 +0100
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tree5712f1857a2d7af78d9b8c0a156f5c199e67b7c4 /coreboot-x201.mdwn
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-[[!img coreboot.png align="right" alt="coreboot logo"]]
-
-## n00bie guide for getting [[coreboot|http://www.coreboot.org/Welcome_to_coreboot]] to a x201{i/s/t}
-
-###why would I want this?
-- prevent [[badBIOS|https://www.schneier.com/blog/archives/2013/11/badbios.html]]
-- free open source BIOS / EFI implementation
-- fast (faster than Lenovo BIOS)
-- no PCI ID whitelist restrictions (WiFi / WWAN)
-- you can boot even with SATA-password set (for example to change/delete it with hdparm)
-- hotswap harddrive (didn't test, but should work)
-- it's cool.
-
-###okay, show me how!
-#### preliminary actions
-first you should update your existing BIOS. This is important as you cannot update your [[ECP|http://www.thinkwiki.org/wiki/Embedded_Controller_Firmware]] version afterwards. Linux users can use the ISO files provided by Lenovo and do some nice trick described [[here|http://www.thinkwiki.org/wiki/BIOS_update_without_optical_disk]]
-
-It is also advisable to save the output of dmidecode somewhere, as you need specific BIOS versions strings to get thinkpad_acpi to work.
-
-next buy or build a SPI flasher and get a SOIC8 clip for mounting the chip correctly.
-
-#### the ugly part
-you have to dump the existing BIOS using [[flashrom|http://www.flashrom.org]] and an external SPI flasher.
-here's the pinout:
-[[!format bash """
- ==== front (display) =====
-3.3V N/C CLK MOSI
- | | | |
- | | | |
-CS MISO N/C ground
- ==== back (touchpad) =====
-"""]]
-
-[[!img bus_pirate.jpg align="right" size="" alt="buspirate attached"]]
-Now it should look similar to this:
-
-You probably have to adjust your contacts quite often for it to work, so don't give up ;) try to keep the cables as short as possible.
-
-
-now read your chip at least twice with
-
-[[!format bash """
-flashrom -p <yourprogrammer> -r flash.bin
-flashrom -p <yourprogrammer> -r flash2.bin
-diff flash.bin flash2.bin
-"""]]
-
-If the files differ you have read errors
--> bad: check your cables && try again.
-
-#### easy part
-- extract descriptor / intel ME
-[[!format bash """
-dd if=flash.bin of=coreboot/3rdparty/mainboard/lenovo/x201/descriptor.bin \
- count=12288 bs=1M iflag=count_bytes
-dd if=flash.bin of=coreboot/3rdparty/mainboard/lenovo/x201/me.bin \
- skip=12288 count=5230592 bs=1M iflag=count_bytes,skip_bytes
-"""]]
-- extract vgabios.bin from BIOS (I used [[PhoenixTool|http://forums.mydigitallife.info/threads/13194-Tool-to-Insert-Replace-SLIC-in-Phoenix-Insyde-Dell-EFI-BIOSes]] in a WinBitch VM for this, as the included bios extractor from coreboot didn't work for me)
-- hint [[SWIM|http://www.urbandictionary.com/define.php?term=swim]] [[uploaded|http://www.datafilehost.com/d/4c01e3d8]] [[it|http://rghost.net/55012997]] [[somewhere|http://fbx.ro/sseikovp02nh3ds2]] in the internets
-- use your prior version number for local version string (e.g [["6QET70WW (1.40)"|http://www.thinkwiki.org/wiki/List_of_DMI_IDs]])
-- at least UNCHECK fake IFD and specify paths to descriptor / ME
-- select SeaBIOS as payload
-- DO NOT FORGET vgabios.bin
-- [[compile coreboot|http://www.coreboot.org/Build_HOWTO]] (you'll need gcc-multilib and your python bin should point to python2, else create a venv)
-- flash resulting ROM image with
-[[!format bash """
-flashrom -c $Chip -w coreboot/build/coreboot.rom -p internal:laptop=force_I_want_a_brick """]]
-
-credits to Vladimir Serbinenko (coreboot developer) for answering to all my questions and fixing minor problems.
-
-## additional pics
-[[!img chip_location.jpg alt="Chip location"]]
-[[!img soic_clip.jpg alt="SOIC mount"]]
-[[!img self_build_spi.jpg alt="SPI flasher"]]
-
-## additional links
-[[Coreboot wiki page for x201|http://www.coreboot.org/Board:lenovo/x201]]
-[[BIOS extract|http://www.coreboot.org/Bios_extract]]