Powerpc vectors_init.c

[Till Straumann]

Jennifer Averett wrote:
> I am updating the score603e and ep1a bsps, and am a little confused about when to use the vectors_init.c in the bsp shared directory vs when to use the one in libcpu/powerpc/new-exceptions...  It appears that the gen5200 uses one, while the motorola uses the other.  Does anyone know what the differences are, and what the pro's and con's of each are?
>   
Yes. The version in libbsp/powerpc/shared is *deprecated*.
DO NOT USE for new BSPs or when reworking existing ones.

The code was left there so that existing BSPs which have not
been upgraded yet continue to work.
(see libbsp/powerpc/shared/irq/README.deprecated,
 libbsp/powerpc/shared/vectors/README.deprecated)

Many BSPs used to 'copy/paste/cook-their-own-soup' AKA
'derive' from libbsp/powerpc/shared' which made maintaining
this low-level code a real pain.

libcpu/powerpc/new-exceptions

was written mostly from scratch and tries to provide a more
generic framework for CPU and BSP code to use.

There is a README (libcpu/powerpc/new-exceptions/bspsupport/README)
which hopefully explains things.

You can look at the mvme3100 BSP as an example of a BSP that uses
the new framework. No 'vectors' subdirectory and most things from 'irq'
have gone because the BSP mostly uses code from the generic
framework.

HTH
-- Till

> Thanks
> Jennifer Averett
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