diff options
Diffstat (limited to 'IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2Keyboard.c')
| -rw-r--r-- | IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2Keyboard.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2Keyboard.c b/IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2Keyboard.c index 0b4aff7790..c73cf93613 100644 --- a/IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2Keyboard.c +++ b/IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2Keyboard.c @@ -255,6 +255,13 @@ KbdControllerDriverStart ( //
// Fix for random hangs in System waiting for the Key if no KBC is present in BIOS.
+ // When KBC decode (IO port 0x60/0x64 decode) is not enabled,
+ // KeyboardRead will read back as 0xFF and return status is EFI_SUCCESS.
+ // So instead we read status register to detect after read if KBC decode is enabled.
+ //
+
+ //
+ // Return code is ignored on purpose.
//
KeyboardRead (ConsoleIn, &Data);
if ((KeyReadStatusRegister (ConsoleIn) & (KBC_PARE | KBC_TIM)) == (KBC_PARE | KBC_TIM)) {
|