Commit 94796d85 authored by Wolfgang Denk's avatar Wolfgang Denk
Browse files

Make "usage" messages more helpful.

In case of incorrect command invocations U-Boot used to print pretty
useless "usage" messages, for example:

	=> nand markbad
	nand - NAND sub-system

In the result, the user would have to run the "help" command to get
the (available) information about correct command usage. Change this,
so that this information gets always printed.

Note that this changes the user interface of all commands, but
hopefully to the better.
Signed-off-by: default avatarWolfgang Denk <>
parent 4c94f6c5
......@@ -286,21 +286,7 @@ int _do_help (cmd_tbl_t *cmd_start, int cmd_items, cmd_tbl_t * cmdtp, int
for (i = 1; i < argc; ++i) {
if ((cmdtp = find_cmd_tbl (argv[i], cmd_start, cmd_items )) != NULL) {
/* found - print (long) help info */
puts (cmdtp->name);
putc (' ');
if (cmdtp->help) {
puts (cmdtp->help);
} else {
puts ("- No help available.\n");
rcode = 1;
putc ('\n');
#else /* no long help available */
if (cmdtp->usage)
printf ("%s - %s\n", cmdtp->name, cmdtp->usage);
rcode |= cmd_usage(cmdtp);
} else {
printf ("Unknown command '%s' - try 'help'"
" without arguments for list of all"
......@@ -386,9 +372,22 @@ cmd_tbl_t *find_cmd (const char *cmd)
return find_cmd_tbl(cmd, &__u_boot_cmd_start, len);
void cmd_usage(cmd_tbl_t *cmdtp)
int cmd_usage(cmd_tbl_t *cmdtp)
printf("Usage:\n%s - %s\n\n", cmdtp->name, cmdtp->usage);
printf("%s - %s\n\n", cmdtp->name, cmdtp->usage);
printf("Usage:\n%s ", cmdtp->name);
if (!cmdtp->help) {
puts ("- No additional help available.\n");
return 1;
puts (cmdtp->help);
putc ('\n');
return 0;
......@@ -71,7 +71,7 @@ int _do_help (cmd_tbl_t *cmd_start, int cmd_items, cmd_tbl_t * cmdtp, int
cmd_tbl_t *find_cmd(const char *cmd);
cmd_tbl_t *find_cmd_tbl (const char *cmd, cmd_tbl_t *table, int table_len);
extern void cmd_usage(cmd_tbl_t *cmdtp);
extern int cmd_usage(cmd_tbl_t *cmdtp);
extern void install_auto_complete(void);
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