sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

PcAtChipsetPkg/PcRtc: Add two new PCD for RTC Index/Target registers

Browse Source 
In certain HW implementation, the BIT7 of RTC Index register(0x70) is
for NMI sources enable/disable but the BIT7 of 0x70 cannot be read
before writing. Software which doesn't want to change the NMI sources
enable/disable setting can write to the alias register 0x74, through
which only BIT0 ~ BIT6 of 0x70 is modified.
So two new PCDs are added so that platform can have the flexibility
to change the default RTC register addresses from 0x70/0x71 to
0x74/0x75.
With the new PCDs added, it can also support special HW that provides
RTC storage in a different register pairs.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Ruiyu Ni
2018-05-25 16:29:48 +08:00
parent 5a57246eab
commit 36dd3c781e
5 changed files with 25 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h
View File

@@ -1,7 +1,7 @@
/** @file
Header file for real time clock driver.
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
This program and the accompanying materials
@@ -47,9 +47,6 @@ typedef struct {
extern PC_RTC_MODULE_GLOBALS mModuleGlobal;
#define PCAT_RTC_ADDRESS_REGISTER 0x70
#define PCAT_RTC_DATA_REGISTER 0x71
//
// Dallas DS12C887 Real Time Clock
//