Date: Thu, 18 Mar 1999 08:59:15 +0100 (MET) From: hm@hcs.de (Hellmuth Michaelis) To: heinig@hdz-ima.rwth-aachen.de (Gerald Heinig) Cc: freebsd-isdn@freebsd.org Subject: Re: I/O base address for ISAC/HSCX Message-ID: <m10NXhz-0000bRC@hcswork.hcs.de> In-Reply-To: <36F01A36.8EB476A8@hdz-ima.rwth-aachen.de> from Gerald Heinig at "Mar 17, 99 10:10:14 pm"
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From the keyboard of Gerald Heinig:
> I've finally found the time again to have a look at the i4b internals
> and I have a question which has been bugging me for a while now: why do
> you do all that I/O address translation ie. base + offset - somethingelse
base is the configured base address (0x200/0x240/0x300/0x340)
offset is an offset for a specific register from the base
+/-somethingelse is a magic constant the manufacturer choosed for his hardware
> the lines
>
> #define AVM_CONF_REG 0x1800 /* base offset for config register */
> #define AVM_CONF_IRQ 0x1801 /* base offset for IRQ register */
> /* config register write */
>
> in i4b_avm_a1.c are a source of puzzlement. Where do you get the 0x1800
> from?
They were gotten from dissassembling the hardware and/or MSDOS drivers
(as were the information for many other cards :-((( ), for details for
this one, see: http://www.arg1.demon.co.uk/avm.html
hellmuth
--
Hellmuth Michaelis Tel +49 40 559747-70
HCS Hanseatischer Computerservice GmbH Fax +49 40 559747-77
Oldesloer Strasse 97-99 Mail hm [at] hcs.de
22457 Hamburg WWW http://www.hcs.de
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