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2023-04-20Revert "Fix GRUB handling of the E6400 keyboard"Nicholas Chin
This reverts commit 1497ae045104145de677fd151da4de6e92be4e5a. The blanket GRUB patch seems to break PS/2 keyboard handling across other platforms, so revert it.
2023-04-19Fix GRUB handling of the E6400 keyboardNicholas Chin
This introduces a patch to grub which disables the coreboot specific handling, allowing PS/2 keyboards to be handled the same as i386-pc. However this alone breaks the keyboard in Linux, requiring coreboot to perform PS/2 initialization. I think GRUB may be restoring the original configuration of the PS/2 controller once it exits, and if coreboot doesn't initialize the controller then it's restored to the default state which Linux doesn't seem to like. I think the emulated keyboard interface provided by the EC on the E6400 behaves in a non-standard way that is incompatible with the old coreboot specific handling.
2023-04-19Add configs for the Latitude E6400Nicholas Chin
Tested the 4MiB ROMs but not the 8 or 16 MiB ones. This uses the same board.cfg as the GM45 ThinkPads with an IFD+GBE from ich9gen. Known issues: - The internal keyboard does not work properly in GRUB. It seems like the keyboard controller is outputing set 1 (XT) scancodes, but GRUB is interpreting them as set 2 (AT) scancodes. This may also have something to do with scancode translation. However, the keyboard works fine in SeaBIOS and Linux. USB keyboards also work properly. - The subsystem IDs in the GBE region are hardcoded for a Thinkpad in ich9gen, though this doesn't seem to cause issues in Linux. The vendor IFD and GBE region do have some differences from the generated binaries, though they do not appear to be critical.