PCI range checking under qemu-system-sparc64

[Nathan Whitehorn]

FYI, if you set kern.vty=vt, you get graphics with QEMU on sparc64.
-Nathan

On 08/22/14 05:58, Mark Cave-Ayland wrote:
> Hi all,
>
> I'm currently working on a set of patches to enable FreeBSD to boot in 
> -nographic mode under qemu-system-sparc64 and I've just come across 
> the following error during boot:
>
>
> Booting [/boot/kernel/kernel]...
> jumping to kernel entry at 0xc00a0000.
> Copyright (c) 1992-2014 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
>         The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 10.0-RELEASE #0 r260789: Fri Jan 17 11:37:19 UTC 2014
> root at snap.freebsd.org:/usr/obj/sparc64.sparc64/usr/src/sys/GENERIC 
> sparc64
> gcc version 4.2.1 20070831 patched [FreeBSD]
> real memory  = 134217728 (128 MB)
> avail memory = 106053632 (101 MB)
> cpu0: Sun Microsystems UltraSparc-IIi Processor (100.00 MHz CPU)
> random device not loaded; using insecure entropy
> random: <Software, Yarrow> initialized
> kbd0 at kbdmux0
> nexus0: <Open Firmware Nexus device>
> nexus0: <builtin>: incomplete
> pcib0: <U2P UPA-PCI bridge> mem 0x1fe00000000-0x1fe01ffffff irq 
> 2032,2030,2031,2021 on nexus0
> pcib0: Sabre, impl 0, version 0, IGN 0x1f, bus A, 33MHz
> panic: psycho_attach: unsupported number of ranges
> cpuid = 0
> KDB: stack backtrace:
> #0 0xc085db60 at psycho_attach+0x780
> #1 0xc0569dd8 at device_attach+0x518
> #2 0xc056b4e8 at device_probe_and_attach+0x28
> #3 0xc056b510 at bus_generic_attach+0x10
> #4 0xc087704c at nexus_attach+0x58c
> #5 0xc0569dd8 at device_attach+0x518
> #6 0xc056b4e8 at device_probe_and_attach+0x28
> #7 0xc056b87c at bus_generic_new_pass+0x11c
> #8 0xc056aeb8 at bus_set_pass+0xf8
> #9 0xc056af08 at root_bus_configure+0x8
> #10 0xc086a9a4 at configure+0x4
> #11 0xc04d4e3c at mi_startup+0x1dc
> #12 0xc00a0028 at btext+0x28
> Uptime: 1s
>
>
> Having a look at the source it looks like we're being tripped by the 
> following check in psycho.c:
>
>
>       /*
>        * Make sure that the expected ranges are present.  The
>        * OFW_PCI_CS_MEM64 one is not currently used though.
>        */
>       if (i != PSYCHO_NRANGE)
>               panic("%s: unsupported number of ranges", __func__);
>
>
> Now it seems that this occurs because OpenBIOS currently only supports 
> 32-bit PCI memory space (and so doesn't generate the 64-bit PCI memory 
> space entry withing the corresponding property).
>
> I could alter OpenBIOS to add a dummy 64-bit PCI memory space entry to 
> the end of the ranges property, however this particular check does 
> seem to be rather excessive and it is also slightly disingenuous to 
> have OpenBIOS include a declaration for a memory space that it cannot 
> use (plus it seems from the comment above that FreeBSD can't actually 
> use it anyway?!).
>
> Does anyone know why this particular assertion was added and what it's 
> actually trying to guard against?
>
>
> Many thanks,
>
> Mark.
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