EP405 GPIO signal problem

Eugene Surovegin ebs at ebshome.net
Fri Nov 21 05:19:22 EST 2003

On Thu, Nov 20, 2003 at 03:02:15PM +0100, Toni Van Remortel wrote:
> I have an RTAI powered kernel module which outputs 32 bits data via the
> EP405 GPIO ports from the IBM 405GP CPU. These outputs are multiplexed
> with other signals.
> Problem: when I output the 32 bits as one like this:
> writel( buffer, (u32)gpio_base_addr+GPIO0_OR );
> (where buffer is of u32 type)

One thing which looks strange to me. Are you sure you can use 32 GPIO

This is impossible because 405GP has only 23, and I doubt you can use
even this number, because some of the pins are shared with IRQ and
PerCSx lines.


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