powerpc/corenet: fix compile error when CONFIG_SYS_NO_FLASH is defined

ENV location compile logic is wrong, and when CONFIG_SYS_NO_FLASH is defined
and non-NOR u-boot is building, it will cause compile error. Also, add
CONFIG_SYS_FLASH_USE_BUFFER_WRITE for p2041, which will improve NOR flash
write performance.
Signed-off-by: NShaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: NAndy Fleming <afleming@freescale.com>

include/configs/P2041RDB.h

@@ -73,10 +73,13 @@
 #define CONFIG_ENV_OVERWRITE
 
 #ifdef CONFIG_SYS_NO_FLASH
+#ifndef CONFIG_RAMBOOT_PBL
 #define CONFIG_ENV_IS_NOWHERE
+#endif
 #else
 #define CONFIG_FLASH_CFI_DRIVER
 #define CONFIG_SYS_FLASH_CFI
+#define CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 #endif
 
 #if defined(CONFIG_SPIFLASH)
@@ -101,6 +104,8 @@
 #define CONFIG_ENV_IS_IN_NAND
 #define CONFIG_ENV_SIZE			CONFIG_SYS_NAND_BLOCK_SIZE
 #define CONFIG_ENV_OFFSET		(5 * CONFIG_SYS_NAND_BLOCK_SIZE)
+#elif defined(CONFIG_ENV_IS_NOWHERE)
+	#define CONFIG_ENV_SIZE		0x2000
 #else
 	#define CONFIG_ENV_IS_IN_FLASH
 	#define CONFIG_ENV_ADDR		(CONFIG_SYS_MONITOR_BASE \

include/configs/corenet_ds.h

@@ -77,7 +77,7 @@
 #define CONFIG_ENV_OVERWRITE
 
 #ifdef CONFIG_SYS_NO_FLASH
-#ifndef CONFIG_SRIOBOOT_SLAVE
+#if !defined(CONFIG_SRIOBOOT_SLAVE) && !defined(CONFIG_RAMBOOT_PBL)
 #define CONFIG_ENV_IS_NOWHERE
 #endif
 #else