151 lines
5.8 KiB
Markdown
151 lines
5.8 KiB
Markdown
---
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title: First-time ThinkPad X200 flashing
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x-unreviewed: true
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...
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This guide is for those who want libreboot on their ThinkPad X200 while
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they still have the original Lenovo BIOS present. This guide can also be
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followed (adapted) if you brick your X200, to know how to recover.
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If you have the original Lenovo firmware running, you will need to take the
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keyboard and palmrest off so that you can access the flash chip, which is just
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underneath the palm rest. You will then connect an external SPI programmer, to
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re-flash the chip externally while it is powered off with the battery removed.
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NOTE: This guide only applies to the regular X200. For X200S and X200 Tablet
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flashing, please read other guides available on libreboot.srht.site.
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Flash chip size
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===============
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Run this command on x200 to find out flash chip model and its size:
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flashrom -p internal
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MAC address
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===========
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Refer to [mac\_address.md](../hardware/mac_address.md).
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The procedure
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-------------
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This section is for the X200. This does not apply to the X200S or X200
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Tablet (for those systems, you have to remove the motherboard
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completely, since the flash chip is on the other side of the board).
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Remove these screws:\
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Gently push the keyboard towards the screen, then lift it off, and optionally
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disconnect it from the board:\
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Disconnect the cable of the fingerpring reader, and then pull up the palm rest,
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lifting up the left and right side of it:\
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This shows the location of the flash chip, for both SOIC-8 and SOIC-16:\
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Lift back the tape that covers a part of the flash chip, and then
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connect the clip:\
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Now, you should be ready to install libreboot.
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Refer to the [SPI programming instructions](spi.md).
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When you're done, put the system back together. If it doesn't boot, try other
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RAM modules because raminit is very unreliable on this platform (in coreboot).
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Memory
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======
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In DDR3 machines with Cantiga (GM45/GS45/PM45), northbridge requires sticks
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that will work as PC3-8500 (faster PC3/PC3L sticks can work as PC3-8500).
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Non-matching pairs may not work. Single module (meaning, one of the slots
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will be empty) will currently only work in slot 0.
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NOTE: according to users reports, non matching pairs (e.g. 1+2 GiB) might
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work in some cases.
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Make sure that the RAM you buy is the 2Rx8 configuration when buying 4GiB sticks
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(In other words: maximum of 2GiB per rank, 2 ranks per card).
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In this photo, 8GiB of RAM (2x4GiB) is installed:
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Boot it!
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--------
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You should see something like this:
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Now [install GNU+Linux](../gnulinux/).
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X200S and X200 Tablet users: GPIO33 trick will not work.
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--------------------------------------------------------
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sgsit found out about a pin called GPIO33, which can be grounded to
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disable the flashing protections by the descriptor and stop the ME from
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starting (which itself interferes with flashing attempts). The theory
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was proven correct; however, it is still useless in practise.
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Look just above the 7 in TP37 (that's GPIO33):
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By default we would see this in lenovobios, when trying flashrom -p
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internal -w rom.rom:
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FREG0: Warning: Flash Descriptor region (0x00000000-0x00000fff) is read-only.
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FREG2: Warning: Management Engine region (0x00001000-0x005f5fff) is locked.
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With GPIO33 grounded during boot, this disabled the flash protections as
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set by descriptor, and stopped the ME from starting. The output changed
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to:
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The Flash Descriptor Override Strap-Pin is set. Restrictions implied by
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the Master Section of the flash descriptor are NOT in effect. Please note
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that Protected Range (PR) restrictions still apply.
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The part in bold is what got us. This was still observed:
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PR0: Warning: 0x007e0000-0x01ffffff is read-only.
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PR4: Warning: 0x005f8000-0x005fffff is locked.
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It is actually possible to disable these protections. Lenovobios does,
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when updating the BIOS (proprietary one). One possible way to go about
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this would be to debug the BIOS update utility from Lenovo, to find out
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how it's disabling these protections. Some more research is available
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here:
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<http://www.coreboot.org/Board:lenovo/x200/internal_flashing_research>
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Of course, it's likely that the Lenovo BIOS is checking for some bit in memory
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that tells it not to disable flashing, and then it won't set PRx registers. The
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way the Lenovo BIOS updater works is, it is executed in Windows first and then
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a reboot happens, triggering the re-flashing to happen during early boot. It is
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probably setting something in memory and loading the ROM, plus a payload program
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that does the flashing; Lenovo BIOS then probably sees that and runs that, instead
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of setting PRx and going for normal boot. It is theoretically possible that we
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could discover how this works, by debugging the Lenovo BIOS update utility (in
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Windows), and then replicate what it is doing, with some tool for GNU+Linux,
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then load a flashrom binary into memory and the ROM to flash (for the BIOS
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region). You would do this with GPIO33 grounded, and the payload program would
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actually flash the entire chip, with just a normal Libreboot image.
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It's possible. The above is likely the only way that the Lenovo BIOS updater
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program works. So if we discover precisely how to do that, then you could
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just connect some pogo pins to ground GPIO33, then boot up, run some software
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(which would have to be written) that does the above.
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On a related note, libreboot has a utility that could help with
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investigating this:
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[ich9utils.md#demefactory](ich9utils.md#demefactory)
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