env: Add a loadaddr env handler

Remove the hard-coded loadaddr handler and use a callback instead

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

common/cmd_nvedit.c

@@ -73,10 +73,6 @@ SPI_FLASH|NVRAM|MMC|FAT|REMOTE} or CONFIG_ENV_IS_NOWHERE
  */
 #define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
 
-ulong load_addr = CONFIG_SYS_LOAD_ADDR;	/* Default Load Address */
-ulong save_addr;			/* Default Save Address */
-ulong save_size;			/* Default Save Size (in bytes) */
-
 /*
  * This variable is incremented on each do_env_set(), so it can
  * be used via get_env_id() as an indication, if the environment
@@ -270,14 +266,6 @@ int env_change_ok(const ENTRY *item, const char *newval, enum env_op op,
 	}
 #endif
 
-	/*
-	 * Some variables should be updated when the corresponding
-	 * entry in the environment is changed
-	 */
-	if (strcmp(name, "loadaddr") == 0) {
-		load_addr = simple_strtoul(newval, NULL, 16);
-		return 0;
-	}
 	return 0;
 }
 

common/image.c

@@ -43,6 +43,7 @@
 #include <rtc.h>
 #endif
 
+#include <environment.h>
 #include <image.h>
 
 #if defined(CONFIG_FIT) || defined(CONFIG_OF_LIBFDT)
@@ -416,6 +417,26 @@ static const image_header_t *image_get_ramdisk(ulong rd_addr, uint8_t arch,
 /* Shared dual-format routines */
 /*****************************************************************************/
 #ifndef USE_HOSTCC
+ulong load_addr = CONFIG_SYS_LOAD_ADDR;	/* Default Load Address */
+ulong save_addr;			/* Default Save Address */
+ulong save_size;			/* Default Save Size (in bytes) */
+
+static int on_loadaddr(const char *name, const char *value, enum env_op op,
+	int flags)
+{
+	switch (op) {
+	case env_op_create:
+	case env_op_overwrite:
+		load_addr = simple_strtoul(value, NULL, 16);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+U_BOOT_ENV_CALLBACK(loadaddr, on_loadaddr);
+
 ulong getenv_bootm_low(void)
 {
 	char *s = getenv("bootm_low");

include/env_callback.h

@@ -41,6 +41,7 @@
 #define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \
 	"baudrate:baudrate," \
 	"bootfile:bootfile," \
+	"loadaddr:loadaddr," \
 	CONFIG_ENV_CALLBACK_LIST_STATIC
 
 struct env_clbk_tbl {