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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
This commit is contained in:
li-elvin 2012-08-27 08:20:27 +00:00
parent 6a34a2e43c
commit 5df0877aff
1 changed files with 7 additions and 0 deletions
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7
IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2Keyboard.c
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@ -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)) {