x86: Don't spam POST80 codes with slow IO functions

This patch prevents u-boot from "spamming" random progress codes on a port 80 "post card". The previous version of this patch just removed the delays in the "slow" IO functions, as they do not need to be slow, however, this patch is less intrusive. It uses another unused port that is often used by BIOSes (and the Linux Kernel) for small delay timing purposes. Signed-off-by: Stefan Reinauer <[email protected]> Signed-off-by: Simon Glass <[email protected]>
imaami · Nov 30, 2012 · 339c511 · 339c511
1 parent a78d494
commit 339c511
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
@@ -137,7 +137,7 @@ static inline int isa_check_signature(unsigned long io_addr,
 #ifdef SLOW_IO_BY_JUMPING
 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
 #else
-#define __SLOW_DOWN_IO "\noutb %%al,$0x80"
+#define __SLOW_DOWN_IO "\noutb %%al,$0xed"
 #endif
 
 #ifdef REALLY_SLOW_IO