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Re: GPIO on the Au1500

To: <>
Subject: Re: GPIO on the Au1500
From: "Gilad Rom" <>
Date: Mon, 15 Nov 2004 18:38:43 +0200
Cc: <>
Organization: Romat Telecom
Original-recipient: rfc822;
References: <> <0a9001c4cae6$f1aa3890$a701a8c0@lan> <>
Thanks Charles.

First of all, I managed to get it working today,
(mmapping /dev/mem) so it is possible ;)

Secondly, I am using the GPIO ports for our own custom
design, so I am not exposing /dev/mem to all kinds
of nasty userland apps.


----- Original Message ----- From: "Charles Eidsness" <>
To: "Gilad Rom" <>
Cc: <>
Sent: Monday, November 15, 2004 6:17 PM
Subject: Re: GPIO on the Au1500

Hi Gilad,

I'd be really surprised if it's possible. I think that those addresses are beyond the valid physical address range for the mem driver. Even if it did work I personally wouldn't feel comfortable doing that sort of thing. You could inadvertently cause a lot of nasty things to happen. Maybe someone else has a different (better) opinion.

If you do use my driver I uploaded the wrong header file yesterday. I've now uploaded the correct one.


Gilad Rom wrote:
Thank you for the driver, I'm using it as a reference.

Still, I am trying to acccess the GPIO ports of the Au1500
using /dev/mem, but I keep getting these odd values
(see previous messages to this list)

Do you think it is possible, or should I stick to using the driver?

Thank you,

----- Original Message ----- From: "Pete Popov" <>
To: <>; "Gilad Rom" <>
Cc: <>
Sent: Sunday, November 14, 2004 8:45 PM
Subject: Re: GPIO on the Au1500

--- Charles Eidsness <>

Hi Gilad,

A little while ago I wrote my own GPIO driver for
the Au1000, mainly as a learning experience. I never bothered to release it because a driver already exists and I thought it was working.

It was, a long time ago, when it was written for the
Au1000. I had a user app and doc somewhere but can't
find it anymore. The driver didn't support gpio2 and
was, in general, stale. So perhaps your driver will
help Gilad.


I'm not sure if it will work on the Au1550, but if you're interested you can
find the source code here:


Gilad Rom wrote:
> Thanks. Can't I just mmap /dev/mem and use the
> GPIO offset from SYS_BASE?
> > Gilad.
> > ----- Original Message ----- From: "Pete Popov"
> To: "Gilad Rom" <>;
> Sent: Friday, November 12, 2004 8:13 PM
> Subject: Re: GPIO on the Au1500
> > >>
>> --- Gilad Rom <> wrote:
>>> Hello,
>>> I am trying to use the au1000_gpio driver, but
I'm a
>>> little clueless as to how it is meant to be
used. Can I use the GPIO >>> ioctl's from a userland program, or must I write
a kernel module?
>> I'll see if I can dig up some docs and the
>> userland program this weekend. That driver hasn't
>> tested in a while though.
>> Pete
>>> Thank you,
>>> Gilad Rom
>>> Romat Telecom
> > >

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