Hi Peter,

Thanks so much for the patch and including me on the thread. I can confirm that it did fix the problem running on a Linux host, but the OS X bug cited by myself and the OP still remains elusive. It's rather puzzling as I pulled from HEAD and built using the same options on both. I've gotten a bit better with the qemu options now, so I will paste the console output here instead of doing yet another screenshot :) As you can see, it's still getting a fatal exception in the interrupt code. Do you know of a kernel version that would be better behaved than the 3.6.11+ from the "raspberrypi/linux" repo on github? Could I provide a core file that would help?

Thanks again for your efforts.
Joss

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
phoenix:RaspberryPi mysfitt$ qemu-system-arm -kernel kernel/zImage -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial stdio -append "root=/dev/sda2 panic=1 console=ttyAMA0" -redir tcp:5022::22 -bt hci,null -global versatile_pci.broken-irq-mapping=1 pifi-4g.img 
Uncompressing Linux... done, booting the kernel.
Booting Linux on physical CPU 0
Linux version 3.6.11+ (root@jossibox) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1) ) #1 Fri May 10 16:46:40 EDT 2013
CPU: ARMv6-compatible processor [410fb767] revision 7 (ARMv7), cr=00c5387d
CPU: VIPT aliasing data cache, unknown instruction cache
Machine: ARM-Versatile PB
Memory policy: ECC disabled, Data cache writeback
sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
Kernel command line: root=/dev/sda2 panic=1 console=ttyAMA0
PID hash table entries: 1024 (order: 0, 4096 bytes)
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 256MB = 256MB total
Memory: 255388k/255388k available, 6756k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)
    lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
    modules : 0xbf000000 - 0xc0000000   (  16 MB)
      .text : 0xc0008000 - 0xc03f6458   (4026 kB)
      .init : 0xc03f7000 - 0xc04162bc   ( 125 kB)
      .data : 0xc0418000 - 0xc043fb60   ( 159 kB)
       .bss : 0xc043fb84 - 0xc045abb0   ( 109 kB)
NR_IRQS:192
VIC @f1140000: id 0x00041190, vendor 0x41
FPGA IRQ chip 0 "SIC" @ f1003000, 21 irqs
Console: colour dummy device 80x30
Calibrating delay loop... 626.68 BogoMIPS (lpj=3133440)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
Setting up static identity map for 0x305ce0 - 0x305d3c
devtmpfs: initialized
NET: Registered protocol family 16
DMA: preallocated 256 KiB pool for atomic coherent allocations
Serial: AMBA PL011 UART driver
dev:f1: ttyAMA0 at MMIO 0x101f1000 (irq = 12) is a PL011 rev1
console [ttyAMA0] enabled
dev:f2: ttyAMA1 at MMIO 0x101f2000 (irq = 13) is a PL011 rev1
dev:f3: ttyAMA2 at MMIO 0x101f3000 (irq = 14) is a PL011 rev1
fpga:09: ttyAMA3 at MMIO 0x10009000 (irq = 38) is a PL011 rev1
PCI core found (slot 11)
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io  0x0000-0xffff]
pci_bus 0000:00: root bus resource [mem 0x50000000-0x5fffffff]
pci_bus 0000:00: root bus resource [mem 0x60000000-0x6fffffff pref]
pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
PCI: bus0: Fast back to back transfers disabled
pci 0000:00:0c.0: BAR 2: assigned [mem 0x50000000-0x50001fff]
pci 0000:00:0c.0: BAR 1: assigned [mem 0x50002000-0x500023ff]
pci 0000:00:0c.0: BAR 0: can't assign io (size 0x100)
bio: create slab <bio-0> at 0
vgaarb: loaded
SCSI subsystem initialized
Switching to clocksource timer3
NET: Registered protocol family 2
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP: reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
NetWinder Floating Point Emulator V0.97 (double precision)
Installing knfsd (copyright (C) 1996 <email address hidden>).
jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
ROMFS MTD (C) 2007 Red Hat, Inc.
fuse init (API version 7.20)
msgmni has been set to 498
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
clcd-pl11x dev:20: PL110 rev0 at 0x10120000
clcd-pl11x dev:20: Versatile hardware, VGA display
Console: switching to colour frame buffer device 80x30
brd: module loaded
PCI: enabling device 0000:00:0c.0 (0100 -> 0102)
sym0: <895a> rev 0x0 at pci 0000:00:0c.0 irq 27
sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
sym0: SCSI BUS has been reset.
scsi0 : sym-2.2.3
sym0: unknown interrupt(s) ignored, ISTAT=0x5 DSTAT=0x80 SIST=0x0
scsi 0:0:0:0: Direct-Access     QEMU     QEMU HARDDISK    1.4. PQ: 0 ANSI: 5
scsi target0:0:0: tagged command queuing enabled, command queue depth 16.
scsi target0:0:0: Beginning Domain Validation
scsi target0:0:0: Domain Validation skipping write tests
scsi target0:0:0: Ending Domain Validation
scsi 0:0:2:0: CD-ROM            QEMU     QEMU CD-ROM      1.4. PQ: 0 ANSI: 5
scsi target0:0:2: tagged command queuing enabled, command queue depth 16.
scsi target0:0:2: Beginning Domain Validation
scsi target0:0:2: Domain Validation skipping write tests
scsi target0:0:2: Ending Domain Validation
sr0: scsi3-mmc drive: 16x/50x cd/rw xa/form2 cdda tray
cdrom: Uniform CD-ROM driver Revision: 3.20
sd 0:0:0:0: [sda] 8388608 512-byte logical blocks: (4.29 GB/4.00 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
physmap platform flash device: 04000000 at 34000000
physmap-flash.0: Found 1 x32 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000000 Chip ID 0x000000
Intel/Sharp Extended Query Table at 0x0031
Using buffer write method
 sda: sda1 sda2 sda3 sda4
smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <email address hidden>
eth0: SMC91C11xFD (rev 1) at d09ca000 IRQ 25 [nowait]
eth0: Ethernet addr: 52:54:00:12:34:56
sd 0:0:0:0: [sda] Attached SCSI disk
mousedev: PS/2 mouse device common for all mice
TCP: cubic registered
NET: Registered protocol family 17
VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 5
input: AT Raw Set 2 keyboard as /devices/fpga:06/serio0/input/input0
input: ImExPS/2 Generic Explorer Mouse as /devices/fpga:07/serio1/input/input1
EXT3-fs (sda2): error: couldn't mount because of unsupported optional features (240)
EXT2-fs (sda2): error: couldn't mount because of unsupported optional features (240)
EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 8:2.
devtmpfs: mounted
Freeing init memory: 124K
sd 0:0:0:0: [sda] ABORT operation started
scsi target0:0:0: control msgout:
 80 20 51 d.
sd 0:0:0:0: ABORT operation complete.
Unable to handle kernel NULL pointer dereference at virtual address 00000358
pgd = c0004000
[00000358] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
Modules linked in:
CPU: 0    Not tainted  (3.6.11+ #1)
PC is at sym_interrupt+0x7c8/0x1b88
LR is at sym53c8xx_intr+0x40/0x7c
pc : [<c02193a0>]    lr : [<c0214e0c>]    psr: 80000193
sp : c0419e30  ip : cf844800  fp : 00000001
r10: cf935400  r9 : c043fb00  r8 : d0804084
r7 : 00000012  r6 : c045588c  r5 : 00000000  r4 : d0804000
r3 : 00000008  r2 : 0000000d  r1 : 00000000  r0 : 00000000
Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 00c5387d  Table: 0fb40008  DAC: 00000017
Process swapper (pid: 0, stack limit = 0xc0418268)
Stack: (0xc0419e30 to 0xc041a000)
9e20:                                     1be06241 00000000 00000001 00200200
9e40: cf997af0 c004256c cf997ac0 cf844800 c0427898 c043fae4 c0418000 00000100
9e60: c0419e7c cf9cbca0 c045587c 00000000 00000000 0000001b c043fb00 c0428e54
9e80: 00000001 c0214e0c 00000001 00000080 0000001b cf9cbca0 0000001b c0054620
9ea0: c0445420 c0419ec0 00000000 c0428e54 0000001b 00000000 c043fee8 00000000
9ec0: cf997ac0 c0307e44 c0419f74 c00547a8 c0428e54 c0056860 c04321e8 c0053fe4
9ee0: 000000c0 c001470c c043fee8 c0419f10 00000000 c00084f8 c003f840 20000013
9f00: ffffffff c0419f44 c04223d8 c00134c0 00000000 00000000 00000002 cfb20c8c
9f20: cfb20c60 cf997ac0 00000001 c0427898 c04223d8 cf997ac0 c0307e44 c0419f74
9f40: 00000000 c0419f58 c030536c c003f840 20000013 ffffffff 00000000 00000000
9f60: c0427898 c0418000 c0427898 c04223d8 c0419fa4 c030536c c04230c0 cfb20c60
9f80: c0423348 c0418000 c0418000 c043fc68 c0418000 c04230c0 410fb767 c0423348
9fa0: 00000000 c0014a18 c0425fbc c04200d0 ffffffff c04123fc c065b880 00004008
9fc0: 00410e7c c03f771c ffffffff ffffffff c03f728c 00000000 00000000 c04123fc
9fe0: 00000000 00c5387d c042004c c04123f8 c04230b4 00008040 00000000 00000000
[<c02193a0>] (sym_interrupt+0x7c8/0x1b88) from [<c0214e0c>] (sym53c8xx_intr+0x40/0x7c)
[<c0214e0c>] (sym53c8xx_intr+0x40/0x7c) from [<c0054620>] (handle_irq_event_percpu+0x50/0x1b0)
[<c0054620>] (handle_irq_event_percpu+0x50/0x1b0) from [<c00547a8>] (handle_irq_event+0x28/0x38)
[<c00547a8>] (handle_irq_event+0x28/0x38) from [<c0056860>] (handle_level_irq+0x80/0xd4)
[<c0056860>] (handle_level_irq+0x80/0xd4) from [<c0053fe4>] (generic_handle_irq+0x24/0x38)
[<c0053fe4>] (generic_handle_irq+0x24/0x38) from [<c001470c>] (handle_IRQ+0x30/0x84)
[<c001470c>] (handle_IRQ+0x30/0x84) from [<c00084f8>] (vic_handle_irq+0x58/0x98)
[<c00084f8>] (vic_handle_irq+0x58/0x98) from [<c00134c0>] (__irq_svc+0x40/0x54)
Exception stack(0xc0419f10 to 0xc0419f58)
9f00:                                     00000000 00000000 00000002 cfb20c8c
9f20: cfb20c60 cf997ac0 00000001 c0427898 c04223d8 cf997ac0 c0307e44 c0419f74
9f40: 00000000 c0419f58 c030536c c003f840 20000013 ffffffff
[<c00134c0>] (__irq_svc+0x40/0x54) from [<c003f840>] (finish_task_switch.constprop.68+0x78/0xec)
[<c003f840>] (finish_task_switch.constprop.68+0x78/0xec) from [<c030536c>] (__schedule+0x1a0/0x3bc)
[<c030536c>] (__schedule+0x1a0/0x3bc) from [<c0014a18>] (cpu_idle+0xa4/0xc0)
[<c0014a18>] (cpu_idle+0xa4/0xc0) from [<c03f771c>] (start_kernel+0x26c/0x2bc)
Code: e5d42540 e3a03008 e5c43540 e5842550 (e5951358) 
---[ end trace 25ce2cfc77dea57b ]---
Kernel panic - not syncing: Fatal exception in interrupt

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

On May 14, 2013, at 6:58 AM, Peter Maydell <email address hidden> wrote:

> It's very unlikely to be the patch you mention, since that's for SD card
> emulation and you're not using SD card emulation. It's probably just a
> regression between 1.4 and 1.5, and I'm fairly sure it's in some changes
> I made to the versatilepb PCI controller model -- I will investigate.
> 
> -- 
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1094564
> 
> Title:
>  images used as scsi disks not readable (qemu-system-arm, macos 10.8)
> 
> Status in The MacPorts Project:
>  New
> Status in QEMU:
>  New
> 
> Bug description:
>  Using a arm1176 kernel and the raspbian image (10-28 or 12-16) as my
>  disk, I get as far as mounting root and then get SCSI errors with
>  1.3.0 and the current origin/master. git bisect says the issue is
> 
>  commit f563a5d7a820424756f358e747238f03e866838a
>  Merge: a273652 aee0bf7
>  Author: Paolo Bonzini <email address hidden>
>  Date:   Wed Oct 31 10:42:51 2012 +0100
> 
>      Merge remote-tracking branch 'origin/master' into threadpool
> 
>      Signed-off-by: Paolo Bonzini <email address hidden>
> 
> 
>  I am using:
>  qemu-system-arm -no-reboot -M versatilepb -cpu arm1176 -m 256 -hda 2012-12-16-wheezy-raspbian.img -kernel kernel-qemu -append "root=/dev/sda2 rootfstype=ext4 elevator=deadline rootwait panic=1" -serial stdio -usbdevice tablet -net nic -net user,hostfwd=tcp::40022-:22
> 
>  Configured on MacOS 10.8.2 with current Xcode and MacPorts installed, thus:
>  CPATH=/opt/local/include CFLAGS="-pipe -O2 -arch x86_64" CPPFLAGS="-I/opt/local/include" CXXFLAGS="-pipe -O2 -arch x86_64" LIBRARY_PATH="/opt/local/lib" MACOSX_DEPLOYMENT_TARGET="10.8" CXX="/usr/bin/clang++" LDFLAGS="-L/opt/local/lib -arch x86_64" OBJC=/usr/bin/clang FCFLAGS="-pipe -O2 -m64" INSTALL="/usr/bin/install -c" OBJCFLAGS="-pipe -O2 -arch x86_64" CC="/usr/bin/clang"  ./configure --prefix=/opt/local --cpu=x86_64 --cc=/usr/bin/clang --objcc=/usr/bin/clang --host-cc=/usr/bin/clang --python=/opt/local/bin/python2.7 --target-list=arm-softmmu
> 
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/macports/+bug/1094564/+subscriptions