make `go` optional

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

README

@@ -644,6 +644,7 @@ The following options need to be configured:
 		CONFIG_CMD_FDOS		* Dos diskette Support
 		CONFIG_CMD_FLASH	  flinfo, erase, protect
 		CONFIG_CMD_FPGA		  FPGA device initialization support
+		CONFIG_CMD_GO		* the 'go' command (exec code)
 		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
 		CONFIG_CMD_I2C		* I2C serial bus support
 		CONFIG_CMD_IDE		* IDE harddisk support

common/cmd_boot.c

@@ -28,6 +28,8 @@
 #include <command.h>
 #include <net.h>
 
+#ifdef CONFIG_CMD_GO
+
 /* Allow ports to override the default behavior */
 __attribute__((weak))
 unsigned long do_go_exec (ulong (*entry)(int, char * const []), int argc, char * const argv[])
@@ -67,6 +69,8 @@ U_BOOT_CMD(
 	"      passing 'arg' as arguments"
 );
 
+#endif
+
 U_BOOT_CMD(
 	reset, 1, 0,	do_reset,
 	"Perform RESET of the CPU",

include/config_cmd_defaults.h

@@ -11,6 +11,7 @@
 
 #define CONFIG_CMD_BOOTM 1
 #define CONFIG_CMD_EXPORTENV 1
+#define CONFIG_CMD_GO 1
 #define CONFIG_CMD_IMPORTENV 1
 
 #endif