Date: Wed, 26 Dec 2001 23:31:22 -0500 From: "Joe & Fhe Barbish" <barbish@a1poweruser.com> To: "FBSD Questions" <questions@FreeBSD.ORG> Subject: internal pci modems and pnpinfo Message-ID: <LPBBIGIAAKKEOEJOLEGOAEHLCKAA.barbish@a1poweruser.com>
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The FBSD FAQ below tells about using pnpinfo to get the info needed to post
entry in sio.c file. I'm at 4.4 and using a pci pnp internal modem. At boot
time I get the unknown card message. Pnpinfo returns no info. Is pnpinfo
only for isa modems. How do I get the info to enter into sio.c table?
4.26. Why is my PnP card no longer found (or found as unknown) since
upgrading to FreeBSD 4.x?
FreeBSD 4.x is now much more PnP-centric and this has had the side effect of
some PnP devices (e.g. sound cards and internal modems) not working even
though they worked under FreeBSD 3.x.
The reasons for this behaviour are explained by the following e-mail, posted
to the freebsd-questions mailing list by Peter Wemm, in answer to a question
about an internal modem that was no longer found after an upgrade to FreeBSD
4.x (the comments in [] have been added to clarify the context.
The PNP bios preconfigured it [the modem] and left it laying around in port
space, so [in 3.x] the old-style ISA probes ``found'' it there.
Under 4.0, the ISA code is much more PnP-centric. It was possible [in 3.x]
for an ISA probe to find a ``stray'' device and then for the PNP device id
to match and then fail due to resource conflicts. So, it disables the
programmable cards first so this double probing cannot happen. It also means
that it needs to know the PnP id's for supported PnP hardware. Making this
more user tweakable is on the TODO list.
To get the device working again requires finding its PnP id and adding it to
the list that the ISA probes use to identify PnP devices. This is obtained
using pnpinfo(8) to probe the device, for example this is the output from
pnpinfo(8) for an internal modem:
# pnpinfo
Checking for Plug-n-Play devices...
Card assigned CSN #1
Vendor ID PMC2430 (0x3024a341), Serial Number 0xffffffff
PnP Version 1.0, Vendor Version 0
Device Description: Pace 56 Voice Internal Plug & Play Modem
Logical Device ID: PMC2430 0x3024a341 #0
Device supports I/O Range Check
TAG Start DF
I/O Range 0x3f8 .. 0x3f8, alignment 0x8, len 0x8
[16-bit addr]
IRQ: 4 - only one type (true/edge)
[more TAG lines elided]
TAG End DF
End Tag
Successfully got 31 resources, 1 logical fdevs
-- card select # 0x0001
CSN PMC2430 (0x3024a341), Serial Number 0xffffffff
Logical device #0
IO: 0x03e8 0x03e8 0x03e8 0x03e8 0x03e8 0x03e8 0x03e8 0x03e8
IRQ 5 0
DMA 4 0
IO range check 0x00 activate 0x01
The information you require is in the ``Vendor ID'' line at the start of the
output. The hexadecimal number in parentheses (0x3024a341 in this example)
is the PnP id and the string immediately before this (PMC2430) is a unique
ASCII id. This information needs adding to the file /usr/src/sys/isa/sio.c.
You should first make a backup of sio.c just in case things go wrong. You
will also need it to make the patch to submit with your PR (you are going to
submit a PR, are you not?) then edit sio.c and search for the line
static struct isa_pnp_id sio_ids[] = {
then scroll down to find the correct place to add the entry for your device.
The entries look like this, and are sorted on the ASCII Vendor ID string
which should be included in the comment to the right of the line of code
along with all (if it will fit) or part of the Device Description from the
output of pnpinfo(8):
{0x0f804f3f, NULL}, /* OZO800f - Zoom 2812 (56k Modem) */
{0x39804f3f, NULL}, /* OZO8039 - Zoom 56k flex */
{0x3024a341, NULL}, /* PMC2430 - Pace 56 Voice Internal Modem */
{0x1000eb49, NULL}, /* ROK0010 - Rockwell ? */
{0x5002734a, NULL}, /* RSS0250 - 5614Jx3(G) Internal Modem */
Add the hexadecimal Vendor ID for your device in the correct place, save the
file, rebuild your kernel, and reboot. Your device should now be found as an
sio device as it was under FreeBSD 3.x
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