changeset 624566640d7c in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=624566640d7c
description:
Dev: Make the RTC device ignore writes to a read only bit.
diffstat:
1 file changed, 4 insertions(+), 2 deletions(-)
src/dev/mc146818.cc | 6 ++++--
diffs (24 lines):
diff -r d12ff89c7692 -r 624566640d7c src/dev/mc146818.cc
--- a/src/dev/mc146818.cc Sun Jan 25 20:31:17 2009 -0800
+++ b/src/dev/mc146818.cc Sun Jan 25 20:32:26 2009 -0800
@@ -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 @@
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))
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