Add a simple load option to setexpr

Make setexpr accept a 2 parameter variant that will simply load a value
into a variable.  This is useful for loading a value from memory.

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

diff --git a/common/cmd_setexpr.c b/common/cmd_setexpr.c
index 7b140de..5a04295 100644 (file)
--- a/common/cmd_setexpr.c
+++ b/common/cmd_setexpr.c
@@ -57,12 +57,22 @@ static int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
        int w;
 
        /* Validate arguments */
-       if ((argc != 5) || (strlen(argv[3]) != 1))
+       if (argc != 5 && argc != 3)
+               return CMD_RET_USAGE;
+       if (argc == 5 && strlen(argv[3]) != 1)
                return CMD_RET_USAGE;
 
        w = cmd_get_data_size(argv[0], 4);
 
        a = get_arg(argv[2], w);
+
+       if (argc == 3) {
+               sprintf(buf, "%lx", a);
+               setenv(argv[1], buf);
+
+               return 0;
+       }
+
        b = get_arg(argv[4], w);
 
        switch (argv[3][0]) {
@@ -87,8 +97,11 @@ static int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 U_BOOT_CMD(
        setexpr, 5, 0, do_setexpr,
        "set environment variable as the result of eval expression",
-       "[.b, .w, .l] name value1 <op> value2\n"
+       "[.b, .w, .l] name [*]value1 <op> [*]value2\n"
        "    - set environment variable 'name' to the result of the evaluated\n"
        "      express specified by <op>.  <op> can be &, |, ^, +, -, *, /, %\n"
-       "      size argument is only meaningful if value1 and/or value2 are memory addresses"
+       "      size argument is only meaningful if value1 and/or value2 are\n"
+       "      memory addresses (*)\n"
+       "setexpr[.b, .w, .l] name *value\n"
+       "    - load a memory address into a variable"
 );