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Diffstat (limited to 'docs/git/index.html')
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1 files changed, 18 insertions, 2 deletions
diff --git a/docs/git/index.html b/docs/git/index.html index ed2b5044..8c6a1389 100644 --- a/docs/git/index.html +++ b/docs/git/index.html @@ -145,20 +145,36 @@ <p> <b>This is for Lenovo BIOS users on the ThinkPad X60/X60S, X60 Tablet and T60. If you have coreboot or libreboot running already, ignore this.</b> </p> + + <p> + BUC.TS isn't really specific to these laptops, but is a bit inside the a register in the chipset on some Intel systems. + </p> <p> Bucts is needed when flashing in software the X60/X60S/X60T/T60 ROM while Lenovo BIOS is running; external flashing will be safe regardless. - Each ROM contains identical data inside the two final 64K region in the file. + Each ROM contains identical data inside the two final 64K region in the file*. This corresponds to the final two 64K regions in the flash chip. Lenovo BIOS will prevent you from writing the final one, so running "<b>bucts 1</b>" will set the machine to boot from the other block instead (which is writeable along with everything beneath it when using a patched flashrom. see <a href="#build_flashrom">#build_flashrom</a>). - After shutting down and booting up after the first flash, + After shutting down and booting up after the first flash of libreboot, the final 64K block is writeable so you flash the ROM again with an unpatched flashrom and run "<b>bucts 0</b>" to make the machine boot from the normal (highest) block again. </p> <p> + *Libreboot ROM images have identical data in those two 64KiB regions because dd is used to do that, by the build system. + If you're building from upstream (coreboot), you have to do it manually. + </p> + + <p> + BUC.TS is backed up (powered) by the NVRAM battery (or CMOS battery, as some people call it). On thinkpads, + this is typically in a yellow plastic package with the battery inside, connected via power lines to the + mainboard. Removing that battery removes power to BUC.TS, resetting the bit back to 0 (if you previously set + it to 1). + </p> + + <p> BUC.TS utility is included in libreboot_src.tar.xz and libreboot_util.tar.xz.<br/> <b>If you downloaded from git, follow <a href="#build_meta">#build_meta</a> before you proceed.</b> </p> |