diff options
| author | Andreas Bießmann <biessmann@corscience.de> | 2010-06-09 14:13:45 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-06-29 22:34:11 +0200 |
| commit | eb70d05d740c1d82474d2c31242a4e995584de24 (patch) | |
| tree | 0fabc66bf36b501115c442435e5508f1b8ae0162 /arch | |
| parent | c99ea790788ae83d813e2c6c03291cb5672cc6c0 (diff) | |
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 Bießmann <biessmann@corscience.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/avr32/cpu/start.S | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/avr32/cpu/start.S b/arch/avr32/cpu/start.S index d37a46eb18..99c9e06cb8 100644 --- a/arch/avr32/cpu/start.S +++ b/arch/avr32/cpu/start.S @@ -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 |