General help message cleanup

Many of the help messages were not really helpful; for example, many
commands that take no arguments would not print a correct synopsis
line, but "No additional help available." which is not exactly wrong,
but not helpful either.

Commit ``Make "usage" messages more helpful.'' changed this
partially. But it also became clear that lots of "Usage" and "Help"
messages (fields "usage" and "help" in struct cmd_tbl_s respective)
were actually redundant.

This patch cleans this up - for example:

Before:
	=> help dtt
	dtt - Digital Thermometer and Thermostat

	Usage:
	dtt         - Read temperature from digital thermometer and thermostat.

After:
	=> help dtt
	dtt - Read temperature from Digital Thermometer and Thermostat

	Usage:
	dtt

Signed-off-by: Wolfgang Denk <wd@denx.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/board/amcc/taishan/showinfo.c b/board/amcc/taishan/showinfo.c
index b471c95..2a78a22 100644
--- a/board/amcc/taishan/showinfo.c
+++ b/board/amcc/taishan/showinfo.c
@@ -168,7 +168,7 @@ int do_show_xbridge_info(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 }
 
 U_BOOT_CMD(xbriinfo, 1, 1, do_show_xbridge_info,
-	   "Show PCIX bridge info", NULL);
+	   "Show PCIX bridge info", "");
 
 #define TAISHAN_PCI_DEV_ID0 0x800
 #define TAISHAN_PCI_DEV_ID1 0x1000
@@ -222,7 +222,7 @@ int do_show_pcix_device_info(cmd_tbl_t * cmdtp, int flag, int argc,
 }
 
 U_BOOT_CMD(xdevinfo, 1, 1, do_show_pcix_device_info,
-	   "Show PCIX Device info", NULL);
+	   "Show PCIX Device info", "");
 
 extern void show_reset_reg(void);
 
@@ -233,4 +233,4 @@ int do_show_reset_reg_info(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 }
 
 U_BOOT_CMD(resetinfo, 1, 1, do_show_reset_reg_info,
-	   "Show Reset REG info", NULL);
+	   "Show Reset REG info", "");