[U-Boot] [PATCH 2/2] arm: am335x: Enable CONFIG_SYS_NAND_USE_READY on siemens am33xx

[Stefan Roese]

Testing showed a small perfomance gain by using this ready pin to
detect the NAND chip state. Here the values tested on Draco with
Hynix 4GBit NAND:

Without NAND ready pin:

U-Boot# time nand read 80400000 0 400000

NAND read: device 0 offset 0x0, size 0x400000
 4194304 bytes read: OK

time: 2.947 seconds, 2947 ticks

With NAND ready pin:

U-Boot# time nand read 80400000 0 400000

NAND read: device 0 offset 0x0, size 0x400000
 4194304 bytes read: OK

time: 2.795 seconds, 2795 ticks

So an increase of approx. 5%.

Signed-off-by: Stefan Roese <sr at denx.de>
Cc: Tom Rini <trini at ti.com>
Cc: Scott Wood <scottwood at freescale.com>
Cc: Roger Meier <r.meier at siemens.com>
Cc: Samuel Egli <samuel.egli at siemens.com>
---
 include/configs/siemens-am33x-common.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/configs/siemens-am33x-common.h b/include/configs/siemens-am33x-common.h
index 0d5dba1..9f84e09 100644
--- a/include/configs/siemens-am33x-common.h
+++ b/include/configs/siemens-am33x-common.h
@@ -466,6 +466,8 @@
 							/* CS0 */
 #define CONFIG_SYS_MAX_NAND_DEVICE	1		/* Max number of NAND
 							   devices */
+#define CONFIG_SYS_NAND_USE_READY
+
 #if !defined(CONFIG_SPI_BOOT)
 #undef CONFIG_ENV_IS_NOWHERE
 #define CONFIG_ENV_IS_IN_NAND
-- 
2.1.3