Add note on dereferencing /aliases pointers

[karo-tx-uboot.git] / common / cmd_fdt.c

diff --git a/common/cmd_fdt.c b/common/cmd_fdt.c
index d3b19ddc1f4a8d278868af55ddb5b20f6e1d9eb5..94bca4646ad6046495290b8d6c9b9d44fdcd56fd 100644 (file)
--- a/common/cmd_fdt.c
+++ b/common/cmd_fdt.c
@@ -67,6 +67,14 @@ int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
                /*
                 * Set the address [and length] of the fdt.
                 */
+               if (argc == 2) {
+                       if (!fdt_valid()) {
+                               return 1;
+                       }
+                       printf("The address of the fdt is %p\n", working_fdt);
+                       return 0;
+               }
+
                working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 
                if (!fdt_valid()) {
@@ -417,9 +425,21 @@ int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
                ft_board_setup(working_fdt, gd->bd);
 #endif
        /* Create a chosen node */
-       else if (argv[1][0] == 'c')
-               fdt_chosen(working_fdt, 0, 0, 1);
-       else {
+       else if (argv[1][0] == 'c') {
+               unsigned long initrd_start = 0, initrd_end = 0;
+
+               if ((argc != 2) && (argc != 4)) {
+                       printf ("Usage:\n%s\n", cmdtp->usage);
+                       return 1;
+               }
+
+               if (argc == 4) {
+                       initrd_start = simple_strtoul(argv[2], NULL, 16);
+                       initrd_end = simple_strtoul(argv[3], NULL, 16);
+               }
+
+               fdt_chosen(working_fdt, initrd_start, initrd_end, 1);
+       } else {
                /* Unrecognized command */
                printf ("Usage:\n%s\n", cmdtp->usage);
                return 1;
@@ -798,7 +818,8 @@ U_BOOT_CMD(
        "fdt rsvmem print                    - Show current mem reserves\n"
        "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
        "fdt rsvmem delete <index>           - Delete a mem reserves\n"
-       "fdt chosen - Add/update the /chosen branch in the tree\n"
-       "NOTE: If the path or property you are setting/printing has a '#' character\n"
-       "     or spaces, you MUST escape it with a \\ character or quote it with \".\n"
+       "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
+       "                                        <start>/<end> - initrd start/end addr\n"
+       "NOTE: Dereference aliases by omiting the leading '/', "
+               "e.g. fdt print ethernet0.\n"
 );