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authorDavid Brownell <david-b@pacbell.net>2009-07-16 18:40:55 -0700
committerJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2009-08-03 09:26:26 +0200
commit06bffc6ea52d4b390843d295d438b2037d12e5fd (patch)
tree689ea76a23daa57493debfc4fbbf11984bab7271 /include/configs
parent301b7db88fbdf7d118efb79b371b2527a2c31868 (diff)
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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 <david-b@pacbell.net> on RM9200ek Tested-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'include/configs')
-rw-r--r--include/configs/at91rm9200dk.h5
-rw-r--r--include/configs/at91rm9200ek.h5
-rw-r--r--include/configs/cmc_pu2.h5
-rw-r--r--include/configs/csb637.h5
-rw-r--r--include/configs/m501sk.h5
-rw-r--r--include/configs/mp2usb.h5
6 files changed, 0 insertions, 30 deletions
diff --git a/include/configs/at91rm9200dk.h b/include/configs/at91rm9200dk.h
index 2017b66..590c69a 100644
--- a/include/configs/at91rm9200dk.h
+++ b/include/configs/at91rm9200dk.h
@@ -45,11 +45,6 @@
#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 0x00003284 /* 16bit, 2 TDF, 4 WS */
diff --git a/include/configs/at91rm9200ek.h b/include/configs/at91rm9200ek.h
index 58ec94a..b4f075e 100644
--- a/include/configs/at91rm9200ek.h
+++ b/include/configs/at91rm9200ek.h
@@ -56,11 +56,6 @@
#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 0x00003284 /* 16bit, 2 TDF, 4 WS */
diff --git a/include/configs/cmc_pu2.h b/include/configs/cmc_pu2.h
index 80559bf..be478b2 100644
--- a/include/configs/cmc_pu2.h
+++ b/include/configs/cmc_pu2.h
@@ -44,11 +44,6 @@
#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 0x100032ad /* 16bit, 2 TDF, 4 WS */
diff --git a/include/configs/csb637.h b/include/configs/csb637.h
index 7a57696..f4fd808 100644
--- a/include/configs/csb637.h
+++ b/include/configs/csb637.h
@@ -45,11 +45,6 @@
#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 0x00003284 /* 16bit, 2 TDF, 4 WS */
diff --git a/include/configs/m501sk.h b/include/configs/m501sk.h
index 32a8194..5c06642 100644
--- a/include/configs/m501sk.h
+++ b/include/configs/m501sk.h
@@ -46,11 +46,6 @@
*/
#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 0x00003284 /* 16bit, 2 TDF, 4 WS */
diff --git a/include/configs/mp2usb.h b/include/configs/mp2usb.h
index ac678d0..0c2ee60 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 */