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document t480/3050 pmc config 

Signed-off-by: Leah Rowe <info@minifree.org>
master
Leah Rowe 2024-12-31 15:44:26 +00:00
parent 32c80dae9c
commit 3b55fca2c9
2 changed files with 44 additions and 0 deletions
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22
site/docs/install/dell3050.md
View File

@ -178,6 +178,28 @@ service jumper is set).
Errata Errata
====== ======
Power-on after power failure
----------------------------
Older Libreboot revisions made this machine always turn on, when plugging in
a power supply (charger brick), if a previous power loss was observed. This is
because coreboot sets a special register in the PMC that configures such
behaviour, but it was hardcoded to always-on. This is undesirable for most
people, so Libreboot 20241206 *revision 8* and newer releases contain the
following modification:
<https://browse.libreboot.org/lbmk.git/commit/?id=09a01477df67e3ddc36e11123c537332d7813c50>
If you wish to modify this behaviour again, you could modify the patch
referenced there; the actual location of the `.patch` file may change over
time, so you can basically just modify the coreboot source file
at `src/soc/intel/common/block/pmc/pmclib.c` (for the coreboot tree
under `src/coreboot/` in lbmk, pertaining to your board, which can be determined
by reading the `tree` variable in your board's `target.cfg` file within lbmk).
Use the patch as reference, to modify the coreboot behaviour as you wish, and
re-compile [from source](../build/).
TPM disabled TPM disabled
------------ ------------

22
site/docs/install/t480.md
View File

@ -522,6 +522,28 @@ Errata
Some features either don't work, or are untested, when running Libreboot on Some features either don't work, or are untested, when running Libreboot on
the ThinkPad T480 or T480s. the ThinkPad T480 or T480s.
Power-on after power failure
----------------------------
Older Libreboot revisions made this machine always turn on, when plugging in
a power supply (charger brick), if a previous power loss was observed. This is
because coreboot sets a special register in the PMC that configures such
behaviour, but it was hardcoded to always-on. This is undesirable for most
people, so Libreboot 20241206 *revision 8* and newer releases contain the
following modification:
<https://browse.libreboot.org/lbmk.git/commit/?id=09a01477df67e3ddc36e11123c537332d7813c50>
If you wish to modify this behaviour again, you could modify the patch
referenced there; the actual location of the `.patch` file may change over
time, so you can basically just modify the coreboot source file
at `src/soc/intel/common/block/pmc/pmclib.c` (for the coreboot tree
under `src/coreboot/` in lbmk, pertaining to your board, which can be determined
by reading the `tree` variable in your board's `target.cfg` file within lbmk).
Use the patch as reference, to modify the coreboot behaviour as you wish, and
re-compile [from source](../build/).
TPM disabled TPM disabled
------------ ------------