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This section documents how to recover from a bad flash that prevents your ThinkPad X60 Tablet from booting.
You still have Lenovo BIOS, or you had retroboot running and you flashed another ROM; and you had bucts 1 set and the ROM wasn’t dd’d.* or if Lenovo BIOS was present and retroboot wasn’t flashed.
In this case, unbricking is easy: reset BUC.TS to 0 by removing that yellow cmos coin (it’s a battery) and putting it back after a minute or two:
*Those dd commands should be applied to all newly compiled X60 ROM images (the ROM images in retroboot binary archives already have this applied!):
dd if=coreboot.rom of=top64k.bin bs=1 skip=$[$(stat -c %s coreboot.rom) - 0x10000] count=64k dd if=coreboot.rom bs=1 skip=$[$(stat -c %s coreboot.rom) - 0x20000] count=64k | hexdump dd if=top64k.bin of=coreboot.rom bs=1 seek=$[$(stat -c %s coreboot.rom) - 0x20000] count=64k conv=notrunc
(doing this makes the ROM suitable for use when flashing a system that still has Lenovo BIOS running, using those instructions: http://www.coreboot.org/Board:lenovo/x60/Installation.
In this scenario, you compiled a ROM that had an incorrect configuration, or there is an actual bug preventing your system from booting. Or, maybe, you set BUC.TS to 0 and shut down after first flash while Lenovo BIOS was running. In any case, your system is bricked and will not boot at all.
“Unbricking” means flashing a known-good (working) ROM. The problem: you can’t boot the system, making this difficult. In this situation, external hardware (see hardware requirements above) is needed which can flash the SPI chip (where retroboot resides).
Remove those screws:
Remove the HDD:
Push keyboard forward to loosen it:
Also remove that (marked) and unroute the antenna cables:
For some X60T laptops, you have to unroute those too:
Remove the LCD extend board screws. Also remove those screws (see blue marks) and remove/unroute the cables and remove the metal plate:
Remove that screw and then remove the board:
Now wire up the SPI flasher and the SOIC8 test clip.
Refer to rpi_setup.html for how to setup the RPi for flashing.
Note, the guide mentions a 3.3v DC PSU but you don’t need this on the X60 Tablet: if you don’t have or don’t want to use an external PSU, then make sure not to connect the 3.3v leads mentioned in the guide; instead, connect the AC adapter (the one that normally charges your battery) so that the board has power (but don’t boot it up)
Correlate the numbers above with the RPi guide.
Connecting the RPi and test (in this image, an external 3.3v DC PSU was used but you can plug in the battery charger without turning on the board, to get +3.3v):
Flashrom binaries for ARM (tested on a RPi) are distributed in Libreboot release archives. Alternatively, retroboot also distributes flashrom source code which can be built.
SSH’d into the RPi:
# ./flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=4096 -w yourrom.rom
You might try a lower speed if the above doesn’t work well. Make sure the wires are the same length, within 10cm.
It should be
Verifying flash... VERIFIED at the end. If flashrom complains about multiple flash chip definitions detected, then choose one of them following the instructions in the output.
Reverse the steps to re-assemble your system.
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