sanchayanmaity/gem5
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Dev: Make the RTC device ignore writes to a read only bit.

Browse source
This commit is contained in:
Gabe Black 2009-01-25 20:32:26 -08:00
parent 0449fb2b7a
commit 919c3e7fb6
1 changed files with 4 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
src/dev/mc146818.cc
View file

@ -35,6 +35,7 @@
#include <string>
#include "base/bitfield.hh"
#include "base/time.hh"
#include "base/trace.hh"
#include "dev/mc146818.hh"
@ -87,9 +88,10 @@ MC146818::writeData(const uint8_t addr, const uint8_t data)
else {
switch (addr) {
case RTC_STAT_REGA:
if (data != (RTCA_32768HZ | RTCA_1024HZ))
// The "update in progress" bit is read only.
if ((data & ~RTCA_UIP) != (RTCA_32768HZ | RTCA_1024HZ))
panic("Unimplemented RTC register A value write!\n");
stat_regA = data;
replaceBits(stat_regA, data, 6, 0);
break;
case RTC_STAT_REGB:
if ((data & ~(RTCB_PRDC_IE | RTCB_SQWE)) != (RTCB_BIN | RTCB_24HR))