From owner-freebsd-alpha  Tue Jul 25  8: 7:15 2000
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From: Andrew Gallatin <gallatin@cs.duke.edu>
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Date: Tue, 25 Jul 2000 11:07:06 -0400 (EDT)
To: wilko@FreeBSD.ORG
Cc: FreeBSD-alpha mailing list <freebsd-alpha@FreeBSD.ORG>
Subject: Re: presence of DEFPA (fddi) panics 4.1RC
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Wilko Bulte writes:
 > I finally got around to hooking up a serial console to my Miata
 > (never throw your terminal servers away ;)
 > 
 > Anyway:
 > 
 > isp0: interrupting at CIA irq 3
 > fpa0: <Digital DEFPA PCI FDDI Controller> port 0x8100-0x817f mem
 > 0x80800000-0x8080ffff,0x80821000-0x8082107f irq 16 at device 9.0 on pci1
 > 
 > fatal kernel trap:
 > 
 >     trap entry = 0x2 (memory management fault)
 >     a0         = 0x80821014

This is typically happens because  bus_alloc_resource(cfg->dev, SYS_RES_MEMORY,...)
gives you an unusable address unless you specify if you want BWX or
DENSE space.  

See if the following hack helps:

Index: pci/pci_compat.c
===================================================================
RCS file: /home/ncvs/src/sys/pci/pci_compat.c,v
retrieving revision 1.35
diff -u -r1.35 pci_compat.c
--- pci/pci_compat.c    2000/02/28 08:12:24     1.35
+++ pci/pci_compat.c    2000/07/25 15:03:00
@@ -96,7 +96,7 @@
 
        rid = reg;
        res = bus_alloc_resource(cfg->dev, SYS_RES_MEMORY, &rid,
-                                0, ~0, 1, RF_ACTIVE);
+                                0, ~0, 1, RF_ACTIVE|PCI_RF_DENSE);
        if (res) {
                *pa = rman_get_start(res);
                *va = (vm_offset_t) rman_get_virtual(res);


I'm not sure if this is really correct.  But it will certainly rub off
the sharp corners of some devices using the pci compat shims..

Drew


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