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Date: Sat, 08 Dec 2001 18:21:55 +1030
From: David Rowe <david@voicetronix.com.au>
Organization: Voicetronix
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To: hackers@freebsd.org
Subject: Newbie: Driver for PLX9050
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Hello,

I am new to FreeBSD and am attempting to write a device driver for a
Computer Telephony card, that uses the PLX9050 bridge chip.

I started with the KLD sample in section 22.1 of the FreeBSD Developers
Handbook.  However, when I install this driver with kldload, the probe
function doesnt seem to find my card.

This puzzled me for a while, until I checked out dmesg:

pci0: <unknown card> (vendor=0x15e2, dev=0x0500) at 9.0
chip2: <PCI to Other bridge (vendor=10b5 device=9050)> port
0x7000-0x707f mem
0xe4022000-0xe40220ff,0xe4000000-0xe401ffff,0xe4020000-0xe402007f irq 10
at device 10.0 on pci0
pci0: <S3 ViRGE graphics accelerator> at 11.0 irq 12
ed0: <NE2000 PCI Ethernet (RealTek 8029)> port 0x7400-0x741f irq 9 at
device 12.0 on pci0

It seems that the kernel is finding my card (PCI to Other bridge) and
installing some sort of driver for it at boot time.  

OK - so my questions are:

1) How do I access the PLX chip thru this built in "chip2" driver?
2) Do I need to write a kernel mode driver that somehow talks to the
chip2 driver?
3) Or can I do it all from user mode?

Thanks in advance for any suggestions,

David

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