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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 https://doc.coreboot.org/. Contributions welcome!
Flashing on the laptop instructions.
Lenovo X60, X60s, T60 and T60p flashing instructions.
These Lenovo laptops have a register that must be flipped before coreboot can be flashed.
For those/some models with SPI flash chips you have also to modify flashrom. Because the chipset locks down the available commands that flashrom can send to the flash chip, you also need to change the flashrom source in a way that is not suitable to upstream. Flash chips can be identified by various commands (REMS*, RDID etc.). Some of them reply with an ID for the vendor and the exact chip model; others just reply with a single byte which is fine if there is only a small number of chips to distinguish, but won't work for the huge number of flash chips known to flashrom. The problem with the vendor BIOS is that it forbids the higher quality identification commands, so you need to force flashrom to use the lower quality opcode for the chip in your Thinkpad. You have to know the chip model beforehand (e.g. by inspection). Known models on the x60s are SST25VF016B, MX25L1605D and maybe others.
You will need: the flashrom source, a small patch for it, and the bucts utility.
- Patch flashrom to use RES1 SPI identification and spi_chip_write_1 for your flash chip, as well as change the flash chip model id to fit the RES1 command.
- Alternatively, you can copy the existing definition first as it is done in this patch. Choose either method: apply the patch in the link, or do the patch yourself, as per instruction below.
- Find the definition of your flash chip in flashrom's flashchips.c
- Change the .probe field to probe_spi_res1
- Change the .model_id field to the RES1 ID given in the datasheet of the flash chip
- Change the .write field to spi_chip_write_1
flashrom -p internal -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.
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
- Verify that the complete range is filled with ff bytes before proceeding! The above command must output:
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
- If this is not the case, the coreboot image needs to be rebuilt with the second-to-last 64kbyte block unused.
dd if=top64k.bin of=coreboot.rom bs=1 seek=$[$(stat -c %s coreboot.rom) - 0x20000] count=64k conv=notrunc
flashrom -p internal -w coreboot.rom
- This will be slow, it will output errors for addresses 0x0 and 0x1f0000 when working with a 2 Mbyte flash chip, and it will say "FAILED!" at the end, see Peter's mail before you panic.
- Power cycle the machine (i.e. a cold boot, not just a reboot), now starting with coreboot
- Revert all changes to flashrom (maybe backup the binary for later experiments)
flashrom -p internal -w coreboot.rom.
- This will successfully overwrite the entire flash chip, including the last 64k that were write protected with the factory BIOS.
If you had a bad flash you will need a recovery method.
If you only set bucts, then rebooted without doing any flash writes, things might be easier: bucts sets a register that lives on the RTC well, ie. it is powered by the same source that keeps the clock alive. Usually that's a battery on the mainboard, and often there's some way to cut the source (by removing the battery, a jumper, or pads that can be shorted). After doing that (for a few seconds, there might be some capacitors in the way that keep power stable), the register should be reset and the system should boot as normal.
On the x60x, bucts issues might also be solved by "discarging RTC", which is done by pressing the power button 5 times for 10 seconds.
Required/advised hardware and informations
- X60 Hardware Maintenance Manual or T60 Hardware Maintenance Manual for disassembling the laptop
- An SO-8 IC clip, like the Pomona 5250 for instance.
- An external flashrom programmer
0. wire the pomona clip to a programmer that way:
From the #coreboot IRC Channel on FreeNode servers:
Oct 01 15:35:48 <CareBear\> one important thing is that when you connect the clip to the X60 you should not connect all pins [...] Oct 01 15:36:22 <CareBear\> only connect these pins: 1, 2, 4, 5, 6 [...] Oct 01 15:37:21 <CareBear\> also important: first connect charger to laptop, then connect the clip [...] Oct 01 17:49:41 <CareBear\> GNUtoo-desktop : the mainboard must be powered off, but with the charger connected [...] Oct 01 17:50:39 <CareBear\> um, that way there is no way anything will break [...] Oct 01 17:51:00 <CareBear\> it is important not to connect 3v3 from the outside Oct 01 17:51:39 <CareBear\> because the correct power sequencing is not known, and if any other rail must come on before the standby 3v3 then the machine may well break when 3v3 is applied from the outside [...] Oct 01 17:52:48 <CareBear\> it may also be fine - but it is unknown what happens [...] Oct 01 17:53:47 <CareBear\> not supplying 3v3 from the outside is safer Oct 01 17:54:25 <CareBear\> and because the machine is powered off, there is no risk of the chipset accessing the flash chip
In another hand I didn't follow that and wired it without powering the mainboard(mainboard disconnected from power plug, no battery in) and with all pins and it worked...
- Disassemble carefully the laptop, the SO-8 chip is on the bottom of the mainboard...
- connect the pomona clip to the BIOS chip
- flash coreboot or the BIOS
- remount the laptop
Coreboot standard configuration
- It's advised to make SeaBios(instead of coreboot) run the VGA option rom by disabling CONFIG_VGA_ROM_RUN:
[ ] Run VGA Option ROMs
in make menuconfig. Note that you still need to include the option rom in coreboot:
[*] Add a VGA BIOS image
See VGA_support for details on how to include the VGA BIOS image.
- Also disable CONFIG_S3_VGA_ROM_RUN which is for really old linux kernels(2.4) (which is disabled automatically if you don't select CONFIG_VGA_ROM_RUN).
From the #coreboot IRC Channel on FreeNode servers:
Oct 04 13:47:09 <patrickg> that's about running vga init on s3 wakeup - required for some older linux kernels [...] Oct 04 13:47:25 <patrickg> BIOSes call it "POST on wakeup" or sth like that Oct 04 13:47:30 <patrickg> older ~ 2.4 class ;)
Last tested revision on the X60