有关ecos2。0介绍了实时嵌入式的结构以及线程调度的实现和内存的管理等

																																								>				>				>help				>								NAME="GENERATOR"				CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+				">				REL="HOME"				TITLE="eCos Reference Manual"				HREF="ecos-ref.html">				REL="UP"				TITLE="Common Commands"				HREF="common-commands.html">				REL="PREVIOUS"				TITLE="dump"				HREF="dump-command.html">				REL="NEXT"				TITLE="ip_address"				HREF="ip-address-command.html">				>				CLASS="REFENTRY"				BGCOLOR="#FFFFFF"				TEXT="#000000"				LINK="#0000FF"				VLINK="#840084"				ALINK="#0000FF"				>				CLASS="NAVHEADER"				>				SUMMARY="Header navigation table"				WIDTH="100%"				BORDER="0"				CELLPADDING="0"				CELLSPACING="0"				>				>				COLSPAN="3"				ALIGN="center"				>eCos Reference Manual				>				>				>				WIDTH="10%"				ALIGN="left"				VALIGN="bottom"				>				HREF="dump-command.html"				ACCESSKEY="P"				>Prev				>				>				WIDTH="80%"				ALIGN="center"				VALIGN="bottom"				>				>				WIDTH="10%"				ALIGN="right"				VALIGN="bottom"				>				HREF="ip-address-command.html"				ACCESSKEY="N"				>Next				>				>				>				>				ALIGN="LEFT"				WIDTH="100%">				>				>				NAME="HELP-COMMAND">help				>				CLASS="REFNAMEDIV"				>				NAME="AEN3316"				>				>				>Name				>help -- Display help on available commands				>				CLASS="REFSYNOPSISDIV"				>				NAME="AEN3319">				>Synopsis				>				>				CLASS="COMMAND"				>help				>  [				CLASS="REPLACEABLE"				>				> topic				>				>]				>				>				CLASS="REFSECT1"				>				NAME="AEN3324"				>				>				>Arguments				>				CLASS="INFORMALTABLE"				>				NAME="AEN3326">				>				>				BORDER="1"				CLASS="CALSTABLE"				>				>				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>Name				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>Type				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>Description				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>Default				>				>				>				>				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>				CLASS="REPLACEABLE"				>				>topic				>				>				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>String				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>Which command to provide help for.				>				WIDTH="25%"				ALIGN="LEFT"				VALIGN="TOP"				>All commands				>				>				>				>				>				>				>				>				CLASS="REFSECT1"				>				NAME="AEN3345"				>				>				>Description				>				>The 				CLASS="COMMAND"				>help				> command displays information about the available				RedBoot commands.  If a 				CLASS="emphasis"				>				CLASS="EMPHASIS"				>topic				>				> is given, then the display				is restricted to information about that specific command.				      				>				>If the command has sub-commands, e.g. 				CLASS="COMMAND"				>fis				>, then the topic				specific display will print additional information about the available sub-commands.				special (ICMP) packets to a specific host. These packets should be automatically				returned by that host. The command will indicate how many of these round-trips				were successfully completed. 				      				>				>				CLASS="REFSECT1"				>				NAME="AEN3352"				>				>				>Examples				>				>Show generic help.  Note that the contents of this display will depend on the various configuration				options for RedBoot when it was built.								BORDER="5"				BGCOLOR="#E0E0F0"				WIDTH="70%"				>				>				>				CLASS="SCREEN"				>RedBoot> 				CLASS="USERINPUT"				>				>help				>				>				Manage aliases kept in FLASH memory				   alias name [value]				Manage machine caches				   cache [ON | OFF]				Display/switch console channel				   channel [-1|<channel number>]				Compute a 32bit checksum [POSIX algorithm] for a range of memory				   cksum -b <location> -l <length>				Display (hex dump) a range of memory				   dump -b <location> [-l <length>] [-s] [-1|2|4]				Manage FLASH images				   fis {cmds}				Manage configuration kept in FLASH memory				   fconfig [-i] [-l] [-n] [-f] [-d] | [-d] nickname [value]				Execute code at a location				   go [-w <timeout>] [entry]				Help about help?				   help [<topic>]				Set/change IP addresses				   ip_address [-l <local_ip_address>] [-h <server_address>]				Load a file				   load [-r] [-v] [-d] [-h <host>] [-m {TFTP | HTTP | {x|y}MODEM -c <channel_number>}]				        [-b <base_address>] <file_name>				Compare two blocks of memory				   mcmp -s <location> -d <location> -l <length> [-1|-2|-4]				Fill a block of memory with a pattern				   mfill -b <location> -l <length> -p <pattern> [-1|-2|-4]				Network connectivity test				   ping [-v] [-n <count>] [-l <length>] [-t <timeout>] [-r <rate>]				        [-i <IP_addr>] -h <IP_addr>				Reset the system				   reset 				Display RedBoot version information				   version 				Display (hex dump) a range of memory				   x -b <location> [-l <length>] [-s] [-1|2|4]				>				>				>				> 				      				>				>Help about a command with sub-commands.								BORDER="5"				BGCOLOR="#E0E0F0"				WIDTH="70%"				>				>				>				CLASS="SCREEN"				>RedBoot> 				CLASS="USERINPUT"				>				>help fis				>				>				Manage FLASH images				   fis {cmds}				Create an image				  fis create -b <mem_base> -l <image_length> [-s <data_length>]				      [-f <flash_addr>] [-e <entry_point>] [-r <ram_addr>] [-n] <name>				Display an image from FLASH Image System [FIS]				  fis delete name				Erase FLASH contents				  fis erase -f <flash_addr> -l <length>				Display free [available] locations within FLASH Image System [FIS]				  fis free 				Initialize FLASH Image System [FIS]				  fis init [-f]				Display contents of FLASH Image System [FIS]				  fis list [-c] [-d]				Load image from FLASH Image System [FIS] into RAM				  fis load [-d] [-b <memory_load_address>] [-c] name				Write raw data directly to FLASH				  fis write -f <flash_addr> -b <mem_base> -l <image_length>				>				>				>				> 				      				>				>				CLASS="NAVFOOTER"				>				ALIGN="LEFT"				WIDTH="100%">				SUMMARY="Footer navigation table"				WIDTH="100%"				BORDER="0"				CELLPADDING="0"				CELLSPACING="0"				>				>				WIDTH="33%"				ALIGN="left"				VALIGN="top"				>				HREF="dump-command.html"				ACCESSKEY="P"				>Prev				>				>				WIDTH="34%"				ALIGN="center"				VALIGN="top"				>				HREF="ecos-ref.html"				ACCESSKEY="H"				>Home				>				>				WIDTH="33%"				ALIGN="right"				VALIGN="top"				>				HREF="ip-address-command.html"				ACCESSKEY="N"				>Next				>				>				>				>				WIDTH="33%"				ALIGN="left"				VALIGN="top"				>dump				>				WIDTH="34%"				ALIGN="center"				VALIGN="top"				>				HREF="common-commands.html"				ACCESSKEY="U"				>Up				>				>				WIDTH="33%"				ALIGN="right"				VALIGN="top"				>ip_address				>				>				>				>				>				>