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<!-- Copyright (C) 2003 Red Hat, Inc. -->
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<!-- permission is obtained from the copyright holder. -->
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<HTML
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><HEAD
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><TITLE
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>Cirrus Logic ARM EP7312 Development Board
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Hardware Setup</TITLE
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"><LINK
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REL="HOME"
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TITLE="eCos User Guide"
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HREF="ecos-user-guide.html"><LINK
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REL="UP"
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TITLE="Target Setup"
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HREF="appendix-target-setup.html"><LINK
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REL="PREVIOUS"
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TITLE="Cirrus Logic ARM EP7212 Development Board
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Hardware Setup"
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HREF="setup-arm-ep7212.html"><LINK
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REL="NEXT"
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TITLE="Cirrus Logic ARM EP7209 Development Board Hardware Setup"
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HREF="setup-arm-ep7209.html"></HEAD
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><TH
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ALIGN="center"
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>eCos User Guide</TH
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></TR
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><TR
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><TD
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HREF="setup-arm-ep7212.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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>Appendix A. Target Setup</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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HREF="setup-arm-ep7209.html"
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>Next</A
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><A
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NAME="SETUP-ARM-EP7312">Cirrus Logic ARM EP7312 Development Board
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Hardware Setup</H1
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><P
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>The Cirrus Logic EP7312 Development Board is similar
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to the EP7212 Development Board from a hardware setup viewpoint,
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and is based on the same port of eCos.</P
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><P
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>When rebuilding the RedBoot ROM image or an eCos application,
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change the "Cirrus Logic processor variant" option
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(CYGHWR_HAL_ARM_EDB7XXX_VARIANT)
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from the EP7211 to the EP7312. This can be selected in the
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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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>eCos Configuration Tool</I
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></SPAN
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>
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, or if using ecosconfig, can be set by uncommenting the user_value
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property of this option in ecos.ecc and setting it to "EP7312".</P
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><P
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>See the RedBoot documentation for building and installing RedBoot for this
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target. Only RedBoot is supported as a boot image; ROMRAM startup is
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recommended.</P
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NAME="EP7312-90MHZ-OPERATION">90MHz Operation</H2
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><P
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>The EP7xxx targets offer a choice of clock speeds, from 18MHz to a maximum,
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normally, of 72MHz. These are described as kHz values 18432 36864 49152
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and 73728 within the configuration tool. If you have a release which
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supports it, you will also see 90317 as an available option here, for 90MHz
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operation.</P
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><P
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>This option only applies to certain EP7312 hardware, not all EP7312 boards
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support it. Do not select 90MHz when building RedBoot or your eCos
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application unless you are absolutely sure that your board supports it.</P
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><P
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>If you do have a 90MHz board and wish to execute at 90MHz, it is in fact
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not necessary to build RedBoot specially, if you build your eCos
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application configured for 90MHz. RedBoot will run at 72MHz and your
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application will run at 90MHz. If you do install a 90MHz RedBoot, then you
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must build eCos for 90MHz or timing and baud rates on serial I/O will be
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wrong.</P
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><P
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>In other words, code (either eCos app or RedBoot) built for 90MHz will
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“change up a gear” when it starts up; but code built for 72MHz,
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because it needs to run correctly on boards without the
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“gearbox” does not change back down, so if you mix the two,
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unexpected timing can result. To run a non-eCos application without any
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hardware initialization code at 90MHz, you must install a specially-built
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RedBoot.</P
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></DIV
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></DIV
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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="setup-arm-ep7212.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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HREF="ecos-user-guide.html"
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ACCESSKEY="H"
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>Home</A
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WIDTH="33%"
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><A
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HREF="setup-arm-ep7209.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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><TR
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Cirrus Logic ARM EP7212 Development Board
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Hardware Setup</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="appendix-target-setup.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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>Cirrus Logic ARM EP7209 Development Board Hardware Setup</TD
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></TR
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></TABLE
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></DIV
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