From 3b3b5df6ec23af05519075fc32a784716f4479dd Mon Sep 17 00:00:00 2001 From: Christian Franke Date: Tue, 8 Mar 2016 00:00:23 +0100 Subject: Reorganisation --- Projekte/Coreboot-X201.mdwn | 79 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 Projekte/Coreboot-X201.mdwn (limited to 'Projekte/Coreboot-X201.mdwn') diff --git a/Projekte/Coreboot-X201.mdwn b/Projekte/Coreboot-X201.mdwn new file mode 100644 index 0000000..df87846 --- /dev/null +++ b/Projekte/Coreboot-X201.mdwn @@ -0,0 +1,79 @@ +[[!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 -r flash.bin +flashrom -p -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]] -- cgit v1.2.1