[RTEMS Project] #4954: sparc: Simplify the clock driver and CPU counter support

[RTEMS trac]

#4954: sparc: Simplify the clock driver and CPU counter support
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 Reporter:  Sebastian Huber  |       Owner:  Sebastian Huber
     Type:  enhancement      |      Status:  assigned
 Priority:  normal           |   Milestone:  6.1
Component:  arch/sparc       |     Version:  6
 Severity:  normal           |  Resolution:
 Keywords:  qualification    |  Blocked By:
 Blocking:                   |
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Description changed by Sebastian Huber:

Old description:

> Unfortunately, most SPARC SoCs supported by RTEMS lack a proper free-
> running counter. The only exception is the GR740. For the pre-qualified
> GR712RC BSP, the current implementation is too complicated. Make the fall
> back to a free-running GPTIMER mandatory for the leon3 BSP family to
> simplify things.

New description:

 Unfortunately, most SPARC SoCs supported by RTEMS lack a proper free-
 running counter. The only exception are the GR712RC and the GR740. For the
 pre-qualified GR712RC BSP, the current implementation is too complicated.
 Make the fall back to a free-running GPTIMER mandatory for the leon3 BSP
 family to simplify things. For the GR712RC use the DSU time tag counter.

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Ticket URL: <http://devel.rtems.org/ticket/4954#comment:1>
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