From 06bffc6ea52d4b390843d295d438b2037d12e5fd Mon Sep 17 00:00:00 2001 From: David Brownell Date: Thu, 16 Jul 2009 18:40:55 -0700 Subject: rm9200 lowevel_init: don't touch reserved/readonly registers For some reason the AT91rm9200 lowlevel init writes to a bunch of reserved or read-only addresses. All the boards seem to define the value-to-be-written values as zero ... but they shouldn't actually be writing *anything* there. No documented erratum justifies these accesses. It looks like maybe some pre-release BDI-2000 setup code has been carried along by cargo cult programming since at least late 2004 (per GIT history). Here's a patch disabling what seems to be bogosity. Tested on a csb337; there were no behavioral changes. Signed-off-by: David Brownell on RM9200ek Tested-by: Jean-Christophe PLAGNIOL-VILLARD --- include/configs/mp2usb.h | 5 ----- 1 file changed, 5 deletions(-) (limited to 'include/configs/mp2usb.h') diff --git a/include/configs/mp2usb.h b/include/configs/mp2usb.h index ac678d0b6..0c2ee6057 100644 --- a/include/configs/mp2usb.h +++ b/include/configs/mp2usb.h @@ -49,11 +49,6 @@ #ifndef CONFIG_SKIP_LOWLEVEL_INIT #define CONFIG_SYS_USE_MAIN_OSCILLATOR 1 /* flash */ -#define CONFIG_SYS_MC_PUIA_VAL 0x00000000 -#define CONFIG_SYS_MC_PUP_VAL 0x00000000 -#define CONFIG_SYS_MC_PUER_VAL 0x00000000 -#define CONFIG_SYS_MC_ASR_VAL 0x00000000 -#define CONFIG_SYS_MC_AASR_VAL 0x00000000 #define CONFIG_SYS_EBI_CFGR_VAL 0x00000000 #define CONFIG_SYS_SMC_CSR0_VAL 0x00003084 /* 16bit, 2 TDF, 4 WS */ -- cgit v1.2.3