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| author | li-elvin <li-elvin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-27 08:20:27 +0000 |
|---|---|---|
| committer | li-elvin <li-elvin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-27 08:20:27 +0000 |
| commit | 5df0877aff76755db480d4b25712bb2bef508434 (patch) | |
| tree | 2ae11c4a4799906c46b021bddfe64196576ff1f0 | |
| parent | 6a34a2e43c40183f92bddfa7673cb564ed3c0719 (diff) | |
| download | edk2-platforms-5df0877aff76755db480d4b25712bb2bef508434.tar.xz | |
Add comments to explain the reason return status is not checked. The return status of KeyboardRead is not used.
Signed-off-by: Li Elvin <elvin.li@intel.com>
Reviewed-by: Yao Jiewen <jiewen.yao@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13679 6f19259b-4bc3-4df7-8a09-765794883524
| -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)) {
|