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x60/t60 install guide: mention about /dev/mem issue when using bucts

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Leah Rowe 2021-07-29 06:18:09 +01:00
parent a5defb4f5b
commit 12bf76d88e
1 changed files with 17 additions and 0 deletions
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site/docs/install/index.md
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@ -413,6 +413,23 @@ You'll see a lot of errors. This is normal. You should see something like:
If you see this, rejoice! It means that the flash was successful. Please do not
panic. Shut down now, and wait a few seconds, then turn back on again.
**WARNING: if flashrom complains about `/dev/mem` access, please
run `sudo ./bucts 0`. If flashrom is complaining about `/dev/mem`, it means
that you have `CONFIG_STRICT_DEVMEM` enabled in your kernel. Reboot with the
following kernel parameter added in your bootloader: `iomem=relaxed` and try
again with the above instructions. DO NOT continue until the above works, and
you see the expected flashrom output as indicated above.**
If you *did* run flashrom and it failed to flash, but you set bucts to 1 and
shut down, don't worry. Just remove the yellow coin-cell battery (it's underneath
the keyboard, connected to the mainboard), wait a minute or two, reconnect the
coin-cell and try again from scratch. In this instance, if flashrom didn't do
anything, and didn't flash anything, it means you still have Lenovo BIOS but
if bucts is set to 1, you can flush it and set it back to 0. BUC.TS is stored in
volatile memory, powered by that CR2032 coin-cell battery.
Assuming that everything went well:
Flash the ROM for a second time. For this second flashing attempt, the upper
64KiB bootblock is now read-write. Use the *unpatched* flashrom binary: