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m68knommu: use user stack pointer hardware on some ColdFire cores
authorGreg Ungerer <gerg@uclinux.org>
Thu, 4 Nov 2010 03:53:26 +0000 (13:53 +1000)
committerGreg Ungerer <gerg@uclinux.org>
Wed, 5 Jan 2011 05:19:18 +0000 (15:19 +1000)
The more modern ColdFire parts (even if based on older version cores)
have separate user and supervisor stack pointers (a7 register).
Modify the ColdFire CPU setup and exception code to enable and use
this on parts that have it.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

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