crc32: make command optional

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

README

@@ -625,6 +625,7 @@ The following options need to be configured:
 		CONFIG_CMD_BOOTD	  bootd
 		CONFIG_CMD_CACHE	* icache, dcache
 		CONFIG_CMD_CONSOLE	  coninfo
+		CONFIG_CMD_CRC32	* crc32
 		CONFIG_CMD_DATE		* support for RTC, date/time...
 		CONFIG_CMD_DHCP		* DHCP support
 		CONFIG_CMD_DIAG		* Diagnostics

common/cmd_mem.c

@@ -1077,6 +1077,8 @@ mod_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const argv[])
 	return 0;
 }
 
+#ifdef CONFIG_CMD_CRC32
+
 #ifndef CONFIG_CRC32_VERIFY
 
 int do_mem_crc (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
@@ -1161,6 +1163,8 @@ usage:
 }
 #endif	/* CONFIG_CRC32_VERIFY */
 
+#endif
+
 #ifdef CONFIG_CMD_MD5SUM
 int do_md5sum(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
@@ -1277,6 +1281,8 @@ U_BOOT_CMD(
 	"[.b, .w, .l] addr1 addr2 count"
 );
 
+#ifdef CONFIG_CMD_CRC32
+
 #ifndef CONFIG_CRC32_VERIFY
 
 U_BOOT_CMD(
@@ -1296,6 +1302,8 @@ U_BOOT_CMD(
 
 #endif	/* CONFIG_CRC32_VERIFY */
 
+#endif
+
 U_BOOT_CMD(
 	base,	2,	1,	do_mem_base,
 	"print or set address offset",

include/config_cmd_defaults.h

@@ -1,7 +1,7 @@
 /*
  * config_cmd_defaults.h - sane defaults for everyone
  *
- * Copyright (c) 2010 Analog Devices Inc.
+ * Copyright (c) 2010-2011 Analog Devices Inc.
  *
  * Licensed under the GPL-2 or later.
  */
@@ -10,6 +10,7 @@
 #define _CONFIG_CMD_DEFAULTS_H_
 
 #define CONFIG_CMD_BOOTM 1
+#define CONFIG_CMD_CRC32 1
 #define CONFIG_CMD_EXPORTENV 1
 #define CONFIG_CMD_GO 1
 #define CONFIG_CMD_IMPORTENV 1