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Revision as of 04:36, 8 August 2012 by Stuge (talk | contribs) (Replace sizeof() with actual $(stat -c %s) shell command)
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The wiki is being retired!

Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to Contributions welcome!

Lenovo X60, X60s, T60 and T60p flashing instructions.

These Lenovo laptops have a register that must be flipped before coreboot can be flashed. Detailed instructions follow.

You will need: the flashrom source, a small patch [WHAT PATCH? --rah], and the bucts utility.

  1. Patch flashrom to use RES1 SPI identification and spi_chip_write1 for your flash chip, as well as change the flash chip model id to fit the RES1 command. [WHAT DOES THIS MEAN? HOW DO YOU DO THIS? --rah]
  2. Run flashrom -p internal:laptop=force_I_want_a_brick -r factory.bin
    This step is IMPORTANT since the factory BIOS in your machine is tied to your particular system board (or "planar" in IBM FRU terms) with a unique ID not present in factory BIOS updates.
  3. Run dd if=coreboot.rom of=top64k.bin bs=1 skip=$[$(stat -c %s coreboot.rom) - 0x10000] count=64k
  4. Run dd if=coreboot.rom bs=1 skip=$[$(stat -c %s coreboot.rom) - 0x20000] count=64k | hexdump
    Verify that the complete range is filled with ff bytes before proceeding further. If this is not the case, the coreboot image needs to be recreated with the second-to-last 64kbyte block unused.
  5. Run dd if=top64k.bin of=coreboot.rom bs=1 seek=$[$(stat -c %s coreboot.rom) - 0x20000] count=64k conv=notrunc
  6. Run bucts 1
  7. Run flashrom -p internal:laptop=force_I_want_a_brick -w coreboot.rom
    This will be slow, and shall generate an erase error at e.g. 0x1f0000 when working with a 2 Mbyte flash chip.
  8. Power cycle the machine, now starting with coreboot
  9. Undo the flashrom patch, so that you have a stock flashrom
  10. Run bucts 0
  11. Run flashrom -p internal:laptop=force_I_want_a_brick -w coreboot.rom.
    This will successfully overwrite the entire flash chip, including the last 64k that were write protected with the factory BIOS.

These instructions were gleaned from the following mailing list threads: