Dynamic Device Configuration v2

Joel Sherrill Joel.Sherrill at OARcorp.com
Wed Oct 30 11:17:43 UTC 2013

It works in the ALL static drivers case. But when used to size the array to include empty slots for dynamic registration, it doesn't actually do that.

Sebastian Huber <sebastian.huber at embedded-brains.de> wrote:

Hello Joel,

I still don't see the problem with


On 2013-10-29 19:43, Joel Sherrill wrote:
> Hi
> I haven't updated in a while on this. Attached is the current
> patch. In trying to make a user distinction between static drivers
> which are configured by name and the "maximum drivers" which
> was supposed to include the static and dynamic, I uncovered
> a bug in which you ended up with only 1 extra slot maximum
> no matter what.
> This attempts to:
> + make the number of dynamic drivers explicit
> + fix the bug
> + add any error checks I could think of
> Eventually we may want a different scheme but we have to
> fix what we have.
> Please help review this so I can commit it.
> -- Joel Sherrill, Ph.D. Director of Research & Development
> joel.sherrill at OARcorp.com On-Line Applications Research Ask me about RTEMS: a
> free RTOS Huntsville AL 35805 Support Available (256) 722-9985
> 0001-configuration-Separate-static-from-dynamic-drivers.patch
>>From 81cb8b1a1caf9dca38e066f3cfea9efbf6810c67 Mon Sep 17 00:00:00 2001
> From: Joel Sherrill<joel.sherrill at oarcorp.com>
> Date: Mon, 9 Sep 2013 14:00:26 -0500
> Subject: [PATCH] configuration: Separate static from dynamic drivers
> Prior to this patch, when the user dynamically registered device
> drivers, they had to account for the number of statically installed
> drivers and add their dynamic ones on top of that.
> With this patch, the number of static drivers is calculated and not
> modifiable by the user. They configure the number of dynamically
> registered ones.
> The user will get a compile time error for using CONFIGURE_MAXIMUM_DRIVERS.

I don't think we should obsolete CONFIGURE_MAXIMUM_DRIVERS and break existing
application configurations.  Instead we should add an optional


The Device_drivers table is only used to register drivers during system start.
  You can later unregister them if you like.

Sebastian Huber, embedded brains GmbH

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