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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 Resource Usage</TITLE
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><meta name="MSSmartTagsPreventParsing" content="TRUE">
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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 Startup Mode"
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HREF="startup-mode.html"><LINK
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REL="NEXT"
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TITLE="Configuring the RedBoot Environment"
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HREF="configuring-the-redboot-environment.html"></HEAD
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><BODY
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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="startup-mode.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="configuring-the-redboot-environment.html"
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ACCESSKEY="N"
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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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WIDTH="100%"></DIV
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><H1
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CLASS="SECT1"
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><A
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NAME="RESOURCE-USAGE">RedBoot Resource Usage</H1
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><P
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> </P
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><P
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>RedBoot takes up both flash and RAM resources depending on its
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startup mode and number of enabled features. There are also other
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resources used by RedBoot, such as timers. Platform-specific resources
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used by RedBoot are listed in the platform specific parts of this
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manual.</P
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><P
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>Both flash and RAM resources used by RedBoot depend to some
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degree on the features enabled in the RedBoot configuration. It is
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possible to reduce in particular the RAM resources used by RedBoot by
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removing features that are not needed. Flash resources can also be
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reduced, but due to the granularity of the flash (the block sizes),
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reductions in feature size do not always result in flash resource
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savings.</P
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><DIV
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN2631">Flash Resources</H2
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><P
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>On many platforms, a ROM mode RedBoot image resides in the first
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flash sectors, working as the board's primary boot monitor. On these
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platforms, it is also normal to reserve a similar amount of flash for
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a secondary RAM mode image, which is used when updating the primary
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ROM mode image.</P
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><P
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>On other platforms, a ROMRAM mode RedBoot image is used as the
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primary boot monitor. On these platforms there is not normally
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reserved space for a RAM mode RedBoot image, since the ROMRAM mode
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RedBoot is capable of updating the primary boot monitor image.</P
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><P
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>Most platforms also contain a FIS directory (keeping track of
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available flash space) and a RedBoot config block (containing RedBoot
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board configuration data).</P
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><P
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>To see the amount of reserved flash memory, run the <B
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CLASS="COMMAND"
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>fis
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list</B
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> command:
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<TABLE
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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> <TT
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CLASS="USERINPUT"
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><B
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>fis list</B
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></TT
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>
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Name FLASH addr Mem addr Length Entry point
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RedBoot 0x00000000 0x00000000 0x00020000 0x00000000
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RedBoot[RAM] 0x00020000 0x06020000 0x00020000 0x060213C0
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RedBoot config 0x0007F000 0x0007F000 0x00001000 0x00000000
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FIS directory 0x00070000 0x00070000 0x0000F000 0x00000000</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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><P
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>To save flash resources, use a ROMRAM mode RedBoot, or if using
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a ROM mode RedBoot, avoid reserving space for the RedBoot[RAM] image
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(this is done by changing the RedBoot configuration) and download the
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RAM mode RedBoot whenever it is needed. If the RedBoot image takes up
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a fraction of an extra flash block, it may be possible to reduce the
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image size enough to free this block by removing some features.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN2641">RAM Resources</H2
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><P
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>RedBoot reserves RAM space for its run-time data, and such
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things as CPU exception/interrupt tables. It normally does so at the
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bottom of the memory map. It may also reserve space at the top of the
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memory map for configurable RedBoot features such as the net stack
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and zlib decompression support.</P
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><P
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>To see the actual amount of reserved space, 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 RAM usage:
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<TABLE
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BORDER="5"
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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> <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 [ROM]
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Non-certified release, version UNKNOWN - built 13:31:57, May 17 2002
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Platform: FooBar (SH 7615)
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Copyright (C) 2000, 2001, 2002, Red Hat, Inc.
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<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>RAM: 0x06000000-0x06080000, 0x06012498-0x06061000 available</I
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></SPAN
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>
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FLASH: 0x00000000 - 0x00080000, 8 blocks of 0x00010000 bytes each.</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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><P
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>To simplify operations that temporarily need data in free
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memory, the limits of free RAM are also available as aliases (aligned
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to the nearest kilo-byte limit). These are named
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FREEMEMLO and
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FREEMEMHI, and can
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be used in commands like any user defined alias:
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<TABLE
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BORDER="5"
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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> <TT
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CLASS="USERINPUT"
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><B
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>load -r -b %{FREEMEMLO} file</B
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></TT
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>
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Raw file loaded 0x06012800-0x06013e53, assumed entry at 0x06012800</PRE
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></TD
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></TR
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></TABLE
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>
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<TABLE
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BORDER="5"
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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> <TT
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CLASS="USERINPUT"
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><B
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>x -b %{FREEMEMHI}</B
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></TT
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>
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06061000: 86 F5 EB D8 3D 11 51 F2 96 F4 B2 DC 76 76 8F 77 |....=.Q.....vv.w|
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06061010: E6 55 DD DB F3 75 5D 15 E0 F3 FC D9 C8 73 1D DA |.U...u]......s..|</PRE
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></TD
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></TABLE
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></P
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><P
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>To reduce RedBoot's RAM resource usage, use a ROM mode
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RedBoot. The RedBoot features that use most RAM are the net stack, the
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flash support and the gunzip support. These, and other features, can
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be disabled to reduce the RAM footprint, but obviously at the cost of
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lost functionality.</P
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></DIV
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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="startup-mode.html"
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ACCESSKEY="P"
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>Prev</A
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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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ACCESSKEY="H"
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>Home</A
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WIDTH="33%"
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HREF="configuring-the-redboot-environment.html"
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ACCESSKEY="N"
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>Next</A
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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 Startup Mode</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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>Configuring the RedBoot Environment</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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>
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