output of /sbin/lspci is:

00:00.0 Host bridge: Intel Corp. 82850 850 (Tehama) Chipset Host Bridge (MCH) (rev 02)
00:01.0 PCI bridge: Intel Corp. 82850 850 (Tehama) Chipset AGP Bridge (rev 02)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 02)
00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 02)
00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 02)
00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 02)
00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV200 QW [Radeon 7500]
02:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
02:0a.0 Multimedia controller: Motorola: Unknown device 3410
02:0b.0 Multimedia controller: Sigma Designs, Inc. REALmagic Hollywood Plus DVD Decoder (rev 02)

I assume the problem is with "02:0a.0 Multimedia controller: Motorola: Unknown device 3410"

I am running RedHat9, 2.4.20-19.9

I've googled this quite extensively, which is what led me to here. I have an echoaudio Mia pro audio card, and I keep getting "error while initializing the sound driver. device /dev/dsp can't be opened (no such device)". There's a driver for this card and a how-to at the URL space.virgilio.it/g_pochini@virgilio.it/ea.html. I've gone through the full ALSA driver installation procedure listed there, and installed alsa-lib and alsa-utils with no error. In fact, ALSA's mixer runs, but of course I get no output due to the badly configured soundcard.

sndconfig doesn't help because this soundcard isn't listed. I have verified that /lib/modules/2.4.20-19.9/kernel/sound/pci/echoaudio exists, so doesn't that verify the module's properly installed?

modprobe snd-echoaudio

returned nothing.

Any suggestions how i can make RH9 recognize this card? I spoke to the manufacturer, who pointed me to the ALSA page mentioned above, but that's all they knew.

just to add a little more information:

after "modprobe snd-echoaudio" dmesg reads "Card registered: Mia rev.0 (DSP56361) at 0xe6000000 irq 5" and "cat /proc/interrupts" verifies Echoaudio on IRQ 5, but redhat-config-soundcard still detects nothing and sound doesn't work.

"cat /proc/bus/pci/devices" reveals the device "Echoaudio", but it does not appear in /etc/modules.conf, so I tried adding the line "sound-slot-0 Echoaudio", but that had no effect.

in /dev, the perms to audio* and relevant devices have been set to 666.

I'm just guessing,
but did you do:

./cvscompile --with-cards=mia

then

make install

You then have to do a
modprobe snd-mia

BTW do you have a PCI or PCMCIA (laptop) card?
I have the PCMCIA, and have some strange DSP chip problems that we (with the author of the driver) haven't been able to pin down...

Cheers,
Andrés

pd.
Don't forget all the other instructions:

tar xjf alsa-driver-1.0.5a.tar.bz2
cd alsa-driver-1.0.5a
tar xjf ../ea-0.8.12.tar.bz2
patch -p0 < EchoaudioPatch_1.0.5.patch
rm utils/mod-deps
./cvscompile --with-cards=gina24[,other cards] [other options]
cc -Wall `gtk-config --libs` `gtk-config --cflags` -lasound pci/echoaudio/echomixer.c -o Emixer
su
make install
modprobe snd-gina24

Sorry to bump this old thread, but has anyone had any success getting any echoaudio cards working with any flavour of linux?

Nowhere have I read 'Thanks everone, I got it working. All I had to do was............'