[PATCH] leon, gr740: start ASR22:23 up-counter on boot by writing ASR22

Daniel Hellstrom daniel at gaisler.com
Fri Sep 29 11:34:03 UTC 2017


According to data sheet bit 31 in ASR22 must be written with a zero
to start the up-counter. GRMON starts the up-counter for us so running
with GRMON hides the problem that writing to ASR23 has no effect. This
patch is important when running in "flight" from ROM without GRMON.
---
 c/src/lib/libbsp/sparc/leon3/include/leon.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/c/src/lib/libbsp/sparc/leon3/include/leon.h b/c/src/lib/libbsp/sparc/leon3/include/leon.h
index 9b2597f..758b760 100644
--- a/c/src/lib/libbsp/sparc/leon3/include/leon.h
+++ b/c/src/lib/libbsp/sparc/leon3/include/leon.h
@@ -482,7 +482,7 @@ static inline uint32_t leon3_up_counter_high(void)
 static inline void leon3_up_counter_enable(void)
 {
   __asm__ volatile (
-    "mov %g0, %asr23"
+    "mov %g0, %asr22"
   );
 }
 
-- 
2.7.4



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