b7882065f5
Send a null command, specifically "pulse outputs" with no outputs selected, to the KBC after changing A20. This was apparently done by DOS, presumably as a synchronization hack, and the authors of the UHCI spec thought it was inherent. Therefore, there are systems out there (e.g. HP DL360 G5) which will stop responsing to "legacy USB" unless they see the null command, 0xFF, written to port 0x64 at the end of the A20 toggling sequence. Signed-off-by: H. Peter Anvin <hpa@zytor.com> |
||
|---|---|---|
| .. | ||
| i386 | ||