mac help does not reflect correct descriptions and parameter.

So update mac help command.

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushw...@nxp.com>
---
 cmd/mac.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/cmd/mac.c b/cmd/mac.c
index 52d3ba0..4d0dd2b 100644
--- a/cmd/mac.c
+++ b/cmd/mac.c
@@ -13,21 +13,21 @@ extern int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, 
char * const argv[]);
 U_BOOT_CMD(
        mac, 3, 1,  do_mac,
        "display and program the system ID and MAC addresses in EEPROM",
-       "[read|save|id|num|errata|date|ports|0|1|2|3|4|5|6|7]\n"
+       "[read|save|id|num|errata|date|ports|port_number]\n"
        "mac read\n"
-       "    - read EEPROM content into memory\n"
+       "    - read EEPROM content into memory data structure\n"
        "mac save\n"
-       "    - save to the EEPROM\n"
+       "    - save memory data structure to the EEPROM\n"
        "mac id\n"
-       "    - program system id\n"
-       "mac num\n"
-       "    - program system serial number\n"
-       "mac errata\n"
-       "    - program errata data\n"
-       "mac date\n"
-       "    - program date\n"
-       "mac ports\n"
-       "    - program the number of ports\n"
-       "mac X\n"
-       "    - program the MAC address for port X [X=0...7]"
+       "    - program system id per hard coded value\n"
+       "mac num string\n"
+       "    - program system serial number to value string\n"
+       "mac errata string\n"
+       "    - program errata data to value string\n"
+       "mac date YYMMDDhhmmss\n"
+       "    - program date to string value YYMMDDhhmmss\n"
+       "mac ports N\n"
+       "    - program the number of network ports to integer N\n"
+       "mac X string\n"
+       "    - program MAC addr for port X [X=0,1..] to colon separated string"
 );
-- 
2.7.4

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