Hello,
I started to debug my latest problem with Quad HME. First there is a
OF mapping problem, then on quad also a IRQ problem, these I did not
touch. Then came prontk recursion problem that caused panic, this I did
not touch yet. The panic told I cpuld return to PROM with Stop-A but I
couldn't, and this was the problem I tried to solve.
First, why tell the user to press Stop-A or break at all? Is it because
we can extract information from Break-T, Break-P etc? Otherwise the
panic code could drop to prom itself?
I tried the following patch and that did not work - probably because of
the same reason that Break did not work (interrupts off?). Seems the
local_irq_enable() is not enough - but what could help here? Is
prom_halt() the right thing? ... Kad a look of waht Stop-A does, tried
also the second patch... but if it would have worked, Stop-A wouldb
prpbaly also have.
This patch is of course not even close to merging, it's just a hack to
try it out.
diff --git a/kernel/panic.c b/kernel/panic.c
index 2a2ff36..ffe6f2a 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -22,6 +22,9 @@
#include <linux/random.h>
#include <linux/kallsyms.h>
#include <linux/dmi.h>
+#ifdef __sparc__
+#include <asm/oplib.h>
+#endif
int panic_on_oops;
static unsigned long tainted_mask;
@@ -120,13 +123,16 @@ NORET_TYPE void panic(const char * fmt, ...)
extern int stop_a_enabled;
/* Make sure the user can actually press Stop-A (L1-A) */
stop_a_enabled = 1;
- printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
+ printk(KERN_EMERG "Returning to the boot prom\n");
}
#endif
#if defined(CONFIG_S390)
disabled_wait(caller);
#endif
local_irq_enable();
+#ifdef __sparc__
+ prom_halt();
+#endif
for (i = 0;;) {
touch_softlockup_watchdog();
i += panic_blink(i);
And the other one:
diff --git a/kernel/panic.c b/kernel/panic.c
index 2a2ff36..df46a5c 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -22,6 +22,9 @@
#include <linux/random.h>
#include <linux/kallsyms.h>
#include <linux/dmi.h>
+#ifdef __sparc__
+#include <asm/oplib.h>
+#endif
int panic_on_oops;
static unsigned long tainted_mask;
@@ -120,13 +123,19 @@ NORET_TYPE void panic(const char * fmt, ...)
extern int stop_a_enabled;
/* Make sure the user can actually press Stop-A (L1-A) */
stop_a_enabled = 1;
- printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
+ printk(KERN_EMERG "Returning to the boot prom\n");
}
#endif
#if defined(CONFIG_S390)
disabled_wait(caller);
#endif
local_irq_enable();
+#ifdef __sparc__
+ prom_printf("\n");
+ flush_user_windows();
+
+ prom_cmdline();
+#endif
for (i = 0;;) {
touch_softlockup_watchdog();
i += panic_blink(i);
--
Meelis Roos (mroos@xxxxxxxx)
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