Re: PnP modem woes continue, IRQ never fires for modem
On Tue, Dec 02, 1997 at 04:03:29PM -0600, Charles Read wrote:
> [BTW, what is a 'Legacy device', and why would
> you need it for a PnP modem?]
A legacy device is a non-PnP device. You need to tell your BIOS
about them because it can't detect what IRQs/DMA channels they are using,
and you don't want it to configure your PnP devices to conflict.
> a. For the /etc/isapnp.conf file below, how do you know
> what ID to use for the DMA? ie, I can see from Win95
> that I need channels 7 and 6, but should I use
>
> (DMA 0 (Channel 7)) and (DMA 1 (Channel 6))
> or should I use
> (DMA 0 (Channel 7)) and (DMA 0 (Channel 6))
>
> or something else? Or does the DMA 0/1 ID not matter?
It probably doesn't matter, but try both. But I suspect
the sound cabling & DMA channels are just for voice modes
like SVD and aren't really affecting your ability
to talk to the modem at all.
> c. I noticed under the Device>Resources tab for my modem
> in Win95 that two distinct ranges are given: 0x3f8 and
> 0x100. I always use 0x3f8 (or 0x2f8). What is the
> purpose of the second range starting at 0x100?
Unsure.
> # Number of IO addresses required: 8
> (IO 0 (BASE 0x03f8))
> # Logical device decodes 16 bit IO address lines
> # Minimum IO base address 0x0100
> # Maximum IO base address 0x03f8
> # IO base alignment 8 bytes
> # Number of IO addresses required: 8
> # (IO 1 (BASE 0x0100))
If you enable this, Linux will use 0x100 as well for it;
I don't know why that is useful though. It appears in
all four possible configurations so it may be worth enabling.
You mentioned that it doesn't appear in
/proc/interrupts; what about /proc/ioports?
hamish
--
Hamish Moffatt, hamish@debian.org, hamish@rising.com.au, hmoffatt@mail.com
Latest Debian packages at ftp://ftp.rising.com.au/pub/hamish. PGP#EFA6B9D5
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