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How to use command in uboot

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after press "s" to stop the run, into uboot environment,

you can use the help to get help of command usage:

AS352X # help
?       – alias for ‘help’
askenv – get environment variables from stdin
base     – print or set address offset
boot    – boot default, i.e., run ‘bootcmd’
bootd   – boot default, i.e., run ‘bootcmd’
bootm   – boot application image from memory
bootp   – boot image via network using BootP/TFTP protocol
cmp      – memory compare
coninfo – print console devices and information
cp       – memory copy
crc32    – checksum calculation
dhcp    – invoke DHCP client to obtain IP/boot params
go      – start application at address ‘addr’
help    – print online help
loop     – infinite loop on address range
md       – memory display
mm       – memory modify (auto-incrementing)
mtest    – simple RAM test
mw       – memory write (fill)
nand    – NAND sub-system
nboot   – boot from NAND device
nm       – memory modify (constant address)
ping    – send ICMP ECHO_REQUEST to network host
printenv- print environment variables
rarpboot- boot image via network using RARP/TFTP protocol
reginfo – print register information
reset   – Perform RESET of the CPU
setenv – set environment variables
tftpboot- boot image via network using TFTP protocol
version – print monitor version

for more details about some command ,you can use: help COMMAN_NAME to get info:
AS352X # help nand
nand info                  – show available NAND devices
nand device [dev]     – show or set current device
nand read[.jffs2]     – addr off|partition size
nand write[.jffs2]    – addr off|partition size – read/write `size’ bytes starting
    at offset `off’ to/from memory address `addr’
nand read[.yaffs2]     – addr offset size
nand write[.yaffs2]    – addr offset size- read/write `size’ bytes yaffs2 image starting
    at offset `offset’ to/from memory address `addr’
nand erase [clean] [off size] – erase `size’ bytes from
    offset `off’ (entire device if not specified)
nand bad – show bad blocks
nand dump[.oob] off – dump page
nand scrub – really clean NAND erasing bad blocks (UNSAFE)
nand markbad off – mark bad block at offset (UNSAFE)
nand biterr off – make a bit error at offset (UNSAFE)
nand lock [tight] [status] – bring nand to lock state or display locked pages
nand unlock [offset] [size] – unlock section

AS352X # help ping
ping pingAddress

AS352X # help mw
mw [.b, .w, .l] address value [count]
         – write memory

AS352X # help md
md [.b, .w, .l] address [# of objects]
          – memory display
about some nand related command usage:

AS352X # nand device 0
Device 0: NAND 2GiB 3,3V 8-bit… is now current device

AS352X # nand info

Device 0: NAND 2GiB 3,3V 8-bit, sector size 512 KiB

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