Messages in this thread |  | | Date | Mon, 10 Jun 1996 12:24:38 -0400 (EDT) | From | Donald Becker <> | Subject | Re: 1.99.14 & duplicate NE2000 |
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On Sat, 8 Jun 1996, Herbert Rosmanith wrote:
> at booting, a NE2000 (the only network-card in the system!) is reported as: > > > ne.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov) > > NE*000 ethercard probe at 0x340: 00 00 e8 c6 d1 1f > > eth0: NE2000 found at 0x340, using IRQ 15. > > quite fine. /proc/interrupts and /proc/ioports read as follows: ... > 15: 634 NE2000 > ^^^^^^^^^^^^^^^^^^^^^ ... > now I go on, and type > > insmod /lib/modules/1.99.14./net/8390.o > insmod /lib/modules/1.99.14./net/ne.o io=0x340 > ^^^^^^^^ > > this is of course not correct. 0x340 is already being used by eth0. > however, eth1 is detected:
This is the correct behavior. The kernel did exact what you told it to do! Remember, the kernel will allow the *root* user to do nonsensical things. Specifically, the drivers ignore the resource allocation code when told to probe a specific address.
> > eth1: NE2000 found at 0x340, using IRQ 7. > > next strange thing is this IRQ. IRQ=7 is not used under linux, I only use > it under m$/dos for the SB16 card. under m$/dos, the SB16 is initialised the > following way:
You should not normally do autoIRQ on a running system! What's going on here is that the autoIRQ isn't watching IRQ15, since there is already a card registered there. Therefore the driver won't find the correct IRQ line, and will instead pick an active IRQ line without a driver already registered. IRQ7 is the usual "noisy" IRQ line, and is usually the one found.
> last: when I now remove eth1 (rmmod ne.o; rmmod 8390.o), the NE2000 doesn't > show up in /proc/ioports anymore, but that's of course a (folgefehler?) > an error caused by a previous error :-)
Correct: the driver unconditionally unregisters itself when the module is removed. This is arguably the correct behavior.
Donald Becker becker@cesdis.gsfc.nasa.gov USRA-CESDIS, Center of Excellence in Space Data and Information Sciences. Code 930.5, Goddard Space Flight Center, Greenbelt, MD. 20771 301-286-0882 http://cesdis.gsfc.nasa.gov/pub/people/becker/whoiam.html
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