Looking for BSP for Atmel AT91SAM7X-EK

[Ralf Corsepius]

On Fri, 2007-12-14 at 00:33 -0800, Till Straumann wrote:
> Ralf Corsepius wrote:
> > On Wed, 2007-12-12 at 21:27 -0700, Andrei Chichak wrote:
> >   
> >> Thanks Joel,
> >>
> >> Are there any docs around dealing with putting together a new BSP? I 
> >> have taken a look at the BSP and porting guides but there doesn't 
> >> seem to be a section on which configuration files to munge to get the 
> >> bootstrap procedure to pick up the new BSP.
> >>     
> > Well, actually, it's pretty simple.
> >
> > 1. cd <src>/c/src/lib/libbsp/<cpu>
> > and copy over the BSP which resembles to your BSP most
> > cp <bsp> <mybsp>
> >
> > 2. edit your bsp's files below <mybsp>/
> > [The actual act of porting]
> >
> >   
> 
> If I may comment: that would be pretty bad practice.

I disagree.

> A better way would be
>  - make parts in <bsp> that are similar enough to what
>    'mybsp' needs a library that supports both, <bsp> and
>    <mybsp>. Try to make interfaces generic enough so that
>    they could be useful to a yet more similar BSP that
>    may be created in the future (but also: try to keep it simple).
>  - modify <bsp> so it uses the (new) library
>  - let <mybsp> use the library
>  - only add new parts that are really specific to <mybsp>
> 
> The myriad of powerpc BSPs are a painful example of
> the result of the 'copy + edit' strategy when creating new
> BSPs. It's maintenance hell.
The poor shape the powerpc BSPs are in is a result of lack of RTEMS
internal APIs and structural defects of the source code (esp. the
"shared" dirs).

Ralf