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AVR32: Must add NOPs after disabling interrupts for AT32UC3A0512ES

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The AT32UC3A0512ES chip has a bug when disabling interrupts. As a
workaround, two NOPs can be inserted.

Signed-off-by: Gunnar Rangoy <gunnar@rangoy.com>
Signed-off-by: Paul Driveklepp <pauldriveklepp@gmail.com>
Signed-off-by: Olav Morken <olavmrk@gmail.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
This commit is contained in:
Olav Morken 2009-01-23 12:56:32 +01:00 • committed by Haavard Skinnemoen
parent f5f652fa91
commit b423f94063
1 changed files with 7 additions and 0 deletions
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7
lib_avr32/interrupts.c
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@ -35,5 +35,12 @@ int disable_interrupts(void)
sr = sysreg_read(SR);
asm volatile("ssrf %0" : : "n"(SYSREG_GM_OFFSET));
#ifdef CONFIG_AT32UC3A0xxx
/* Two NOPs are required after masking interrupts on the
* AT32UC3A0512ES. See errata 41.4.5.5. */
asm("nop");
asm("nop");
#endif
return !SYSREG_BFEXT(GM, sr);
}