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+<HTML
+><HEAD
+><TITLE
+>RedBoot Startup Mode</TITLE
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+TITLE="Getting Started with RedBoot"
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+TITLE="RedBoot Editing Commands"
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+>eCos Reference Manual</TH
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+><TR
+><TD
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+><A
+HREF="redboot-editing-commands.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
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+>Chapter 1. Getting Started with RedBoot</TD
+><TD
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+><A
+HREF="resource-usage.html"
+ACCESSKEY="N"
+>Next</A
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+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+NAME="STARTUP-MODE">RedBoot Startup Mode</H1
+><P
+>
+ </P
+><P
+>RedBoot can normally be configured to run in a number of startup
+modes (or just "modes" for short), determining its location of
+residence and execution:
+<P
+></P
+><DIV
+CLASS="VARIABLELIST"
+><DL
+><DT
+>ROM mode</DT
+><DD
+><P
+>In this mode, RedBoot both resides and executes from
+ ROM memory (flash or EPROM). This mode is used when there are limited
+ RAM resources. The flash commands cannot update the region of flash
+ where the RedBoot image resides. In order to update the RedBoot image
+ in flash, it is necessary to run a RAM mode instance of
+ RedBoot.</P
+></DD
+><DT
+>ROMRAM mode</DT
+><DD
+><P
+>In this mode, RedBoot resides in ROM memory (flash or
+ EPROM), but is copied to RAM memory before it starts executing. The
+ RAM footprint is larger than for ROM mode, but there are two
+ advantages to make up for this: it normally runs faster (relevant
+ only on slower boards) and it is able to update the flash region
+ where the image resides.</P
+></DD
+><DT
+>RAM mode</DT
+><DD
+><P
+>In this mode, RedBoot both resides and executes from
+ RAM memory. This is used for updating a primary ROM
+ mode image in situ and sometimes as part of the RedBoot installation
+ on the board when there's already an existing (non-RedBoot) boot
+ monitor available.</P
+><P
+> You can only use ROM and ROMRAM mode images for booting a
+ board - a RAM mode image cannot run unless loaded by another ROM
+ monitor. There is no need for this startup mode if a RedBoot ROMRAM
+ mode image is the primary boot monitor. When this startup mode is
+ programmed into flash (as a convenience as it's fast to load from
+ flash) it will generally be named as "RedBoot[RAM]" in the FIS
+ directory. </P
+></DD
+></DL
+></DIV
+>
+
+The chosen mode has influence on flash and RAM resource usage (see
+<A
+HREF="resource-usage.html"
+>the Section called <I
+>RedBoot Resource Usage</I
+></A
+>) and the procedure of an in situ update
+of RedBoot in flash (see <A
+HREF="updating-redboot.html"
+>Chapter 4</A
+>).</P
+><P
+>The startup mode is controlled by the option CYG_HAL_STARTUP
+which resides in the platform HAL. Some platforms provide only some of
+the RAM, ROM, and ROMRAM modes, others provide additional
+modes.</P
+><P
+>To see mode of a currently executing RedBoot, issue the
+<B
+CLASS="COMMAND"
+>version</B
+> command, which prints the RedBoot banner,
+including the startup mode (here ROM):
+<TABLE
+BORDER="5"
+BGCOLOR="#E0E0F0"
+WIDTH="70%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+>RedBoot><TT
+CLASS="USERINPUT"
+><B
+>version</B
+></TT
+>
+
+RedBoot(tm) bootstrap and debug environment <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>[ROM]</I
+></SPAN
+>
+Non-certified release, version UNKNOWN - built 13:31:57, May 17 2002</PRE
+></TD
+></TR
+></TABLE
+></P
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+>Prev</A
+></TD
+><TD
+WIDTH="34%"
+ALIGN="center"
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+><A
+HREF="ecos-ref.html"
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+>Home</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
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+>Next</A
+></TD
+></TR
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+>RedBoot Editing Commands</TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="getting-started-with-redboot.html"
+ACCESSKEY="U"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>RedBoot Resource Usage</TD
+></TR
+></TABLE
+></DIV
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+></HTML
+>
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