ecs user wrote:
> > From: Natalia Portillo <[EMAIL PROTECTED]>
> > Try to boot it with less than 64Mb (48Mb).
> > OS/2 hangs when 64Mb are informed in the standard
> > way they seems to check that in some strange way.
> > No matter it is 4.0, 4.5, eCS or whatever.
>
> It does seem like a memory issue.
>
> If I just keep rebooting everytime it hangs, I can
> finally get a complete boot. Sometimes I have to
> reboot 10-15 times. Once it does boot to the desktop
> OS/2 Warp4 runs very nicely. No hangs once completely
> booted and very responsive (on 2GHz machine). So you
> see it acts more like flaky hardware or flaky driver
> (in the emulation).
>
> Need help.
I looked into this problem about a year ago. As I
recall, the problem was the PIC generating spurious
interrupts. Specifically, if a pending interrupt is
masked on the PIC, the interrupt request to the CPU
is not reset.
I sent a patch to this list that solved the problem
for me (though it was a hack). Unfortunately I can
no longer reproduce the problem (patch or no patch),
but you might still want to try the attached patch.
YMMV.
Hampa
diff -Nur qemu-cvs/hw/i8259.c qemu-local/hw/i8259.c
--- qemu-cvs/hw/i8259.c 2005-06-15 20:09:28.000000000 +0200
+++ qemu-local/hw/i8259.c 2005-06-17 19:12:53.000000000 +0200
@@ -79,20 +79,21 @@
s->irr |= mask;
s->last_irr |= mask;
} else {
+ s->irr &= ~mask;
s->last_irr &= ~mask;
}
}
}
/* return the highest priority found in mask (highest = smallest
- number). Return 8 if no irq */
+ number). Return 16 if no irq */
static inline int get_priority(PicState *s, int mask)
{
int priority;
if (mask == 0)
- return 8;
- priority = 0;
- while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0)
+ return 16;
+ priority = s->priority_add;
+ while ((mask & (1 << (priority & 7))) == 0)
priority++;
return priority;
}
@@ -104,7 +105,7 @@
mask = s->irr & ~s->imr;
priority = get_priority(s, mask);
- if (priority == 8)
+ if (priority == 16)
return -1;
/* compute current priority. If special fully nested mode on the
master, the IRQ coming from the slave is not taken into account
@@ -115,7 +116,7 @@
cur_priority = get_priority(s, mask);
if (priority < cur_priority) {
/* higher priority found: an irq should be generated */
- return (priority + s->priority_add) & 7;
+ return priority & 7;
} else {
return -1;
}
@@ -132,8 +133,10 @@
if (irq2 >= 0) {
/* if irq request by slave pic, signal master PIC */
pic_set_irq1(&pics[0], 2, 1);
+ } else {
pic_set_irq1(&pics[0], 2, 0);
}
+
/* look at requested irq */
irq = pic_get_irq(&pics[0]);
if (irq >= 0) {
@@ -149,6 +152,8 @@
printf("pic: cpu_interrupt\n");
#endif
cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
+ } else {
+ cpu_reset_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
}
}
@@ -297,8 +304,8 @@
case 1: /* end of interrupt */
case 5:
priority = get_priority(s, s->isr);
- if (priority != 8) {
- irq = (priority + s->priority_add) & 7;
+ if (priority != 16) {
+ irq = priority & 7;
s->isr &= ~(1 << irq);
if (cmd == 5)
s->priority_add = (irq + 1) & 7;
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