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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
><HEAD
><TITLE
>RedBoot Startup Mode</TITLE
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>Chapter 1. Getting Started with RedBoot</TD
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><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&#62;<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
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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [startup-mode.html] - Rev 842
