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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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><HEAD
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><TITLE
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>RedBoot Startup Mode</TITLE
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><meta name="MSSmartTagsPreventParsing" content="TRUE">
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<META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="eCos Reference Manual"
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HREF="ecos-ref.html"><LINK
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REL="UP"
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TITLE="Getting Started with RedBoot"
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HREF="getting-started-with-redboot.html"><LINK
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REL="PREVIOUS"
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TITLE="RedBoot Editing Commands"
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HREF="redboot-editing-commands.html"><LINK
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REL="NEXT"
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TITLE="RedBoot Resource Usage"
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HREF="resource-usage.html"></HEAD
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><BODY
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CLASS="SECT1"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>eCos Reference Manual</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="redboot-editing-commands.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 1. Getting Started with RedBoot</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="resource-usage.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="STARTUP-MODE">RedBoot Startup Mode</H1
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><P
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>
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  </P
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><P
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>RedBoot can normally be configured to run in a number of startup
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modes (or just "modes" for short), determining its location of
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residence and execution:
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<P
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></P
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><DIV
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CLASS="VARIABLELIST"
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><DL
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><DT
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>ROM mode</DT
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><DD
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><P
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>In this mode, RedBoot both resides and executes from
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 ROM memory (flash or EPROM). This mode is used when there are limited
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 RAM resources. The flash commands cannot update the region of flash
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 where the RedBoot image resides. In order to update the RedBoot image
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 in flash, it is necessary to run a RAM mode instance of
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 RedBoot.</P
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></DD
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><DT
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>ROMRAM mode</DT
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><DD
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><P
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>In this mode, RedBoot resides in ROM memory (flash or
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 EPROM), but is copied to RAM memory before it starts executing. The
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 RAM footprint is larger than for ROM mode, but there are two
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 advantages to make up for this: it normally runs faster (relevant
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 only on slower boards) and it is able to update the flash region
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 where the image resides.</P
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></DD
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><DT
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>RAM mode</DT
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><DD
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><P
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>In this mode, RedBoot both resides and executes from
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 RAM memory. This is used for updating a primary ROM
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 mode image in situ and sometimes as part of the RedBoot installation
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 on the board when there's already an existing (non-RedBoot) boot
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 monitor available.</P
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><P
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> You can only use ROM and ROMRAM mode images for booting a
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 board - a RAM mode image cannot run unless loaded by another ROM
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 monitor. There is no need for this startup mode if a RedBoot ROMRAM
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 mode image is the primary boot monitor.  When this startup mode is
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 programmed into flash (as a convenience as it's fast to load from
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 flash) it will generally be named as "RedBoot[RAM]" in the FIS
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 directory.  </P
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></DD
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></DL
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></DIV
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>
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The chosen mode has influence on flash and RAM resource usage (see
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<A
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HREF="resource-usage.html"
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>the Section called <I
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>RedBoot Resource Usage</I
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></A
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>) and the procedure of an in situ update
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of RedBoot in flash (see <A
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HREF="updating-redboot.html"
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>Chapter 4</A
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>).</P
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><P
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>The startup mode is controlled by the option CYG_HAL_STARTUP
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which resides in the platform HAL. Some platforms provide only some of
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the RAM, ROM, and ROMRAM modes, others provide additional
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modes.</P
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><P
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>To see mode of a currently executing RedBoot, issue the
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<B
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CLASS="COMMAND"
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>version</B
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> command, which prints the RedBoot banner,
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including the startup mode (here ROM):
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<TABLE
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>RedBoot&#62;<TT
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CLASS="USERINPUT"
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><B
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>version</B
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></TT
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>
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RedBoot(tm) bootstrap and debug environment <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>[ROM]</I
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></SPAN
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>
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Non-certified release, version UNKNOWN - built 13:31:57, May 17 2002</PRE
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></TD
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></TR
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></TABLE
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></P
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CLASS="NAVFOOTER"
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SUMMARY="Footer navigation table"
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="redboot-editing-commands.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="ecos-ref.html"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="resource-usage.html"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>RedBoot Editing Commands</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="getting-started-with-redboot.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>RedBoot Resource Usage</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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>

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