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avr32: disable branch folding 

Due to a hardware bug mentioned in latest AP7000 datasheet errata
(revision M from 09.09) branch folding is unreliable.
This patch disables CPUCR.FE bitfield as stated in datasheet.

Signed-off-by: Andreas Biemann <biessmann@corscience.de>
This commit is contained in:
Andreas Bießmann 2010-06-09 14:13:45 +02:00 committed by Wolfgang Denk
parent c99ea79078
commit eb70d05d74
1 changed files with 4 additions and 3 deletions
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7
arch/avr32/cpu/start.S
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@ -27,9 +27,10 @@
#define SYSREG_MMUCR_S_OFFSET 4
#define SR_INIT (SYSREG_BIT(GM) | SYSREG_BIT(EM) | SYSREG_BIT(M0))
#define CPUCR_INIT (SYSREG_BIT(BI) | SYSREG_BIT(BE) \
| SYSREG_BIT(FE) | SYSREG_BIT(RE) \
| SYSREG_BIT(IBE) | SYSREG_BIT(IEE))
/* due to errata (unreliable branch folding) clear FE bit explicitly */
#define CPUCR_INIT ((SYSREG_BIT(BI) | SYSREG_BIT(BE) \
| SYSREG_BIT(RE) | SYSREG_BIT(IBE) \
| SYSREG_BIT(IEE)) & ~SYSREG_BIT(FE))
/*
* To save some space, we use the same entry point for