215 lines
8.3 KiB
Markdown
215 lines
8.3 KiB
Markdown
---
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title: ThinkPad X60 Recovery guide
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x-toc-enable: true
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...
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This section documents how to recover from a bad flash that prevents
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your ThinkPad X60 from booting.
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ROM images for this machine are well-tested in libreboot, so bricks are rare.
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The most common cause of a brick is operator error, when flashing a ROM image.
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In *most* cases, the cause will be that there is no bootblock, or an invalid
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one.
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Brick type 1: bucts not reset. {#bucts_brick}
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==============================
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You still have Lenovo BIOS, or you had libreboot running and you flashed
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another ROM; and you had bucts 1 set and the ROM wasn't dd'd.\* or if
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Lenovo BIOS was present and libreboot wasn't flashed.
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There are *2* 64KiB bootblocks possible, in the upper part of the ROM image.
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By default (bucts set to 0), the top one is used. If bucts is set to 1, the
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lower one (the one before the top one) is used. This bootblock is the first
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code that executes, during *romstage* as per coreboot hardware initialization.
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BUC is short for *Backup Control* and TS is short for *Top Swap*. This is a
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special register on Intel platforms. Lenovo BIOS sets PRx registers, preventing
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software re-flashing, but there is a bug in the protection, allowing everything
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*except* the upper 64KiB from being flashed. By default, coreboot only puts a
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bootblock in the upper region. If you flash such a ROM, while bucts is set to 1,
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the system won't boot because there's not a valid bootblock; this is common if
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you're re-flashing when coreboot is already installed, and you didn't set bucts
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back to 0.
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When you install on X60/T60 the first time, you set this bucts bit to 1, then
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you re-flash a second time and set it back to 0.
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In this case, unbricking is easy: reset BUC.TS to 0 by removing that
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yellow cmos coin (it's a battery) and putting it back after a minute or
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two:\
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\
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\*Those dd commands should be applied to all newly compiled X60 ROM
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images (the ROM images in libreboot binary archives already have this
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applied!):
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dd if=coreboot.rom of=top64k.bin bs=1 skip=$[$(stat -c %s coreboot.rom) - 0x10000] count=64k
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dd if=coreboot.rom bs=1 skip=$[$(stat -c %s coreboot.rom) - 0x20000] count=64k | hexdump
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dd if=top64k.bin of=coreboot.rom bs=1 seek=$[$(stat -c %s coreboot.rom) - 0x20000] count=64k conv=notrunc
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(doing this makes the ROM suitable for use when flashing a system that
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still has Lenovo BIOS running, using those instructions:
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<http://www.coreboot.org/Board:lenovo/x60/Installation>.
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Brick type 2: bad ROM image {#recovery}
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===========================================
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In this instance, you might have flashed a ROM without the top bootblock copied
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to the lower 64KiB section in the ROM, and you flashed the ROM for the first
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time (from Lenovo BIOS), in which case there is not a valid bootblock.
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In this scenario, you compiled a ROM that had an incorrect
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configuration, or there is an actual bug preventing your system from
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booting. Or, maybe, you set BUC.TS to 0 and shut down after first flash
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while Lenovo BIOS was running. In any case, your system is bricked and
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will not boot at all.
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"Unbricking" means flashing a known-good (working) ROM. The problem:
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you can't boot the system, making this difficult. In this situation,
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external hardware (see hardware requirements above) is needed which can
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flash the SPI chip (where libreboot resides).
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Remove those screws:\
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Push the keyboard forward (carefully):\
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Lift the keyboard up and disconnect it from the board:\
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Grab the right-hand side of the chassis and force it off (gently) and
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pry up the rest of the chassis:\
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You should now have this:\
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Disconnect the wifi antenna cables, the modem cable and the speaker:\
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Unroute the cables along their path, carefully lifting the tape that
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holds them in place. Then, disconnect the modem cable (other end) and
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power connection and unroute all the cables so that they dangle by the
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monitor hinge on the right-hand side:\
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Disconnect the monitor from the motherboard, and unroute the grey
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antenna cable, carefully lifting the tape that holds it into place:\
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Carefully lift the remaining tape and unroute the left antenna cable so
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that it is loose:\
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Remove the screw that is highlighted (do NOT remove the other one; it
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holds part of the heatsink (other side) into place):\
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Remove those screws:\
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Carefully remove the plate, like so:\
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Remove the SATA connector:\
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Now remove the motherboard (gently) and cast the lcd/chassis aside:\
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Lift back that tape and hold it with something. Highlighted is the SPI
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flash chip:\
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Here is another photo, with the numbers of the pins written:\
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\
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This photo shows an SPI flasher used, with SOIC8 test clip:\
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Refer to the following guide:\
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[Externally rewrite 25xx NOR flash via SPI protocol](spi.md)
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NOTE: Do not use the 3.3v rail from your raspberry pi. Leave that disconnected.
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For 3.3v, plug your charger into the mainboard (but do not power on the mainboard)
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when the clip is connected. Before removing the clip, disconnect the charger.
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This will provide adequate 3.3v DC at correct current levels. The SPI flash on an
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X60 shares a common 3.3V rail with many other components on the mainboard,
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which all draw a lot of current, more than your programmer can provide.
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When you're finished flashing, remove the programmer and put it away somewhere.
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Put back the tape and press firmly over it:\
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Your empty chassis:\
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Put the motherboard back in:\
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Reconnect SATA:\
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Put the plate back and re-insert those screws:\
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Re-route that antenna cable around the fan and apply the tape:\
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Route the cable here and then (not shown, due to error on my part)
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reconnect the monitor cable to the motherboard and re-insert the
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screws:\
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Re-insert that screw:\
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Route the black antenna cable like so:\
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Tuck it in neatly like so:\
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Route the modem cable like so:\
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Connect modem cable to board and tuck it in neatly like so:\
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Route the power connection and connect it to the board like so:\
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Route the antenna and modem cables neatly like so:\
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Connect the wifi antenna cables. At the start of the tutorial, this
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system had an Intel wifi chip. Here you see I've replaced it with an
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Atheros AR5B95 (supports 802.11n and can be used without blobs):\
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Connect the modem cable:\
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Connect the speaker:\
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You should now have this:\
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Re-connect the upper chassis:\
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Re-connect the keyboard:\
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Re-insert the screws that you removed earlier:\
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Power on!\
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Operating system:\
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