Title: [7896] trunk/arch/blackfin/kernel/traps.c: bug [#5662], workaround ANOMALY_05000310.
- Revision
- 7896
- Author
- bhsong
- Date
- 2009-11-30 05:33:57 -0500 (Mon, 30 Nov 2009)
Log Message
bug [#5662], workaround ANOMALY_05000310.
when boundary codec return to a function, at the ret point, a new
false hardware error maybe happen too according to tests. here we
ignore the false trap too;
when boundary codes call a function, at the entry point, a new false
hardware error maybe happen according to tests. here we ignore the
false trap too.
Modified Paths
Diff
Modified: trunk/arch/blackfin/kernel/traps.c (7895 => 7896)
--- trunk/arch/blackfin/kernel/traps.c 2009-11-30 09:25:52 UTC (rev 7895)
+++ trunk/arch/blackfin/kernel/traps.c 2009-11-30 10:33:57 UTC (rev 7896)
@@ -525,11 +525,37 @@
/* External Memory Addressing Error */
case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
if (ANOMALY_05000310) {
- unsigned int erraddr = fp->pc;
+ static unsigned long anomaly_rets;
+ unsigned long erraddr = fp->pc;
+
if ((erraddr >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
- (erraddr < (L1_CODE_START + L1_CODE_LENGTH)))
+ (erraddr < (L1_CODE_START + L1_CODE_LENGTH))) {
+ /*
+ * a false hardware error will happen while fetching at
+ * the L1 instruction SRAM boundary, here we ignore the
+ * false trap
+ */
+ anomaly_rets = fp->rets;
goto traps_done;
+ } else if (fp->rets == anomaly_rets)
+ /*
+ * while boundary codec return to a function, at the ret point, a new
+ * false hardware error maybe happen too according to tests. here we
+ * ignore the false trap too
+ */
+ goto traps_done;
+ else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
+ (fp->rets < (L1_CODE_START + L1_CODE_LENGTH)))
+ /*
+ * if boundary codes call a function, at the entry point, a new false
+ * hardware error maybe happen according to tests. here we ignore the
+ * false trap too
+ */
+ goto traps_done;
+ else
+ anomaly_rets = 0;
}
+
info.si_code = BUS_ADRERR;
sig = SIGBUS;
strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
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