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Date:      Sat, 1 Jan 2005 10:11:37 +1100
From:      Peter Jeremy <PeterJeremy@optushome.com.au>
To:        freebsd-stable@freebsd.org
Subject:   ACPI + SMBus disables ISA bus
Message-ID:  <20041231231137.GV79646@cirb503493.alcatel.com.au>

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I'm trying to upgrade a system from 4.10 to 5.3p2 and am running into
problems with the ISA bus disappearing (not probing or attaching) when
I have both ACPI and SMBus enabled.  This leads to a panic when
something tries to do a sysctl on the (non-existent) console.

The problem is masked if I use a serial console because the only ISA
device I need is the VGA adapter and the lack of vga0 and syscons
doesn't worry the serial console.

I've had a google around and it looks like this combination should work.
At least, I can't find anything forbidding it and can find some dmesgs
showing both ACPI and SMBus.

The relevant sections of a GENERIC "boot -v" shows:
...
AcpiOsDerivePciId: bus 0 dev 17 func 0
AcpiOsDerivePciId: bus 0 dev 17 func 0
...
found->	vendor=0x1106, dev=0x3147, revid=0x00
	bus=0, slot=17, func=0
	class=06-01-00, hdrtype=0x00, mfdev=1
	cmdreg=0x0087, statreg=0x0210, cachelnsz=0 (dwords)
	lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
	powerspec 2  supports D0 D3  current D0
	map[20]: type 4, range 32, base 0000fc00, size  4, enabled
...
pci1: <display, VGA> at device 0.0 (no driver attached)
pci0: <multimedia, audio> at device 8.0 (no driver attached)
pci0: <multimedia> at device 11.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 17.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 8233A UDMA133 controller> port 0xfc00-0xfc0f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 17.1 on pci0

If I add the following options to GENERIC:
 device smbus
 device viapm
 device smb
 device iicbb
 device iicbus
then the ISA bus vanishes and the above probe messages change to:
...
pci1: <display, VGA> at device 0.0 (no driver attached)
pci0: <multimedia, audio> at device 8.0 (no driver attached)
pci0: <multimedia> at device 11.0 (no driver attached)
viapropm0: SMBus I/O base at 0x400
viapropm0: <VIA VT8233 Power Management Unit> port 0x400-0x40f at device 17.0 on pci0
viapropm0: SMBus revision code 0x0
smbus0: <System Management Bus> on viapropm0
smb0: <SMBus generic I/O> on smbus0
atapci0: <VIA 8233A UDMA133 controller> port 0xfc00-0xfc0f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 17.1 on pci0

The motherboard is a Gigabyte GA-7VRXP with F12 BIOS (the latest AFAIK).
Switching between PIC and APIC modes in the BIOS has no effect.  There's
no explicit "PnP/nonPnP" option.

Should this work?  If so, where should I look for clues as to why it doesn't
for me?

-- 
Peter Jeremy



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