hw/hppa/lasi: Don't abort on invalid IMR value

NetBSD initializes the LASI IMR value with 0xffffffff to disable all LASI
interrupts. This triggered an assert() and stopped the emulation.  By replacing
the check with a warning in the guest log we now allow NetBSD to boot again.

Signed-off-by: Helge Deller <deller@gmx.de>

hw/hppa/lasi.c

@@ -11,6 +11,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/units.h"
+#include "qemu/log.h"
 #include "qapi/error.h"
 #include "cpu.h"
 #include "trace.h"
@@ -170,8 +171,11 @@ static MemTxResult lasi_chip_write_with_attrs(void *opaque, hwaddr addr,
         /* read-only.  */
         break;
     case LASI_IMR:
-        s->imr = val;  /* 0x20 ?? */
-        assert((val & LASI_IRQ_BITS) == val);
+        s->imr = val;
+        if (((val & LASI_IRQ_BITS) != val) && (val != 0xffffffff))
+            qemu_log_mask(LOG_GUEST_ERROR,
+                "LASI: tried to set invalid %lx IMR value.\n",
+                (unsigned long) val);
         break;
     case LASI_IPR:
         /* Any write to IPR clears the register. */