ps2: disable the keyboard and mouse before flushing the queue If SeaBIOS is run as a payload via coreboot (and presumably as a CSM), then it's possible the keyboard or mouse will still be enabled. This can lead to data being queued even after the flush function attempts to clear the queue. Disabling the keyboard/mouse prior to flushing is pretty standard in DOS programming so it's not surprising that it's needed here. I believe this problem manifests with the Chromebook Pixel. People have reported that sometimes the 'ESC to Select Boot Devices' doesn't work. I can reproduce this faithfully by holding 'Ctrl-L' in the firmware screen during SeaBIOS initialization. I can't test this fix on an actual Pixel because I don't know how to update SeaBIOS but I have tested the patch under QEMU. BUG=none TEST=Boot into SeaBIOS, press ESC, see it working Change-Id: I4e74a559e86539730f4fda1d429612c759da16ee Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Stefan Reinauer <reinauer@google.com> Reviewed-on: https://gerrit.chromium.org/gerrit/49212 Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
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