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20240612 errata update (and fix) 

Signed-off-by: Leah Rowe <info@minifree.org>
master
Leah Rowe 2024-07-06 03:12:04 +01:00
parent c5e54b63f0
commit b8f4f28e56
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@ -938,3 +938,38 @@ The latest changes are listed first, going all the way down to earlier changes:
``` ```
This is 211 changes, since Libreboot 20240504. This is 211 changes, since Libreboot 20240504.
Errata
======
Revision 1
----------
A bug was found, where booting GRUB (payload) on Haswell ThinkPads with a USB
device plugged in would sometimes cause GRUB to hang. This was fixed with the
following patch:
<https://browse.libreboot.org/lbmk.git/commit/?h=20240612_branch&id=70398439baa0127e62d0a7786e21b7de68f1495d>
This patch is included now, on the release archives.
The following archives have been *replaced*, with ones that include this fix:
* Source archive (now marked `20240612rev1`, not `20240612`)
* ROM image archives for: T440p, W541, 9020 SFF and 9020 MT. The new archives
are marked `20240612rev1`, not `20240612`.
This particular bug was nasty, because some of these machines might have
internal USB devices plugged in, such as smartcard readers. It would not have
caused the system to be unusable, because SeaBIOS is the primary payload and
GRUB (payload) is loaded from that.
If you were affected by this bug, please consider switching to the new images,
where this has been fixed. The fix was very simple:
Don't load the xHCI module in GRUB, where it is used, immediately upon booting
GRUB; instead, load it much later on, from `grub.cfg`. This is done, by putting
it on *install* modules, instead of modules. The *install* modules do not
auto-load when GRUB starts.
A full investigation is still required, but this workaround fixes the issue as
far as the user is concerned.