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+><TITLE
+>Cirrus Logic ARM EP7312 Development Board
+Hardware Setup</TITLE
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+Hardware Setup"
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+>eCos User Guide</TH
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+HREF="setup-arm-ep7212.html"
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+>Prev</A
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+><TD
+WIDTH="80%"
+ALIGN="center"
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+>Appendix A. Target Setup</TD
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+><A
+NAME="SETUP-ARM-EP7312">Cirrus Logic ARM EP7312 Development Board
+Hardware Setup</H1
+><P
+>The Cirrus Logic EP7312 Development Board is similar
+to the EP7212 Development Board from a hardware setup viewpoint,
+and is based on the same port of eCos.</P
+><P
+>When rebuilding the RedBoot ROM image or an eCos application,
+change the "Cirrus Logic processor variant" option
+(CYGHWR_HAL_ARM_EDB7XXX_VARIANT)
+from the EP7211 to the EP7312. This can be selected in the
+<SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>eCos Configuration Tool</I
+></SPAN
+>
+, or if using ecosconfig, can be set by uncommenting the user_value
+property of this option in ecos.ecc and setting it to "EP7312".</P
+><P
+>See the RedBoot documentation for building and installing RedBoot for this
+target. Only RedBoot is supported as a boot image; ROMRAM startup is
+recommended.</P
+><DIV
+CLASS="SECT2"
+><H2
+CLASS="SECT2"
+><A
+NAME="EP7312-90MHZ-OPERATION">90MHz Operation</H2
+><P
+>The EP7xxx targets offer a choice of clock speeds, from 18MHz to a maximum,
+normally, of 72MHz. These are described as kHz values 18432 36864 49152
+and 73728 within the configuration tool. If you have a release which
+supports it, you will also see 90317 as an available option here, for 90MHz
+operation.</P
+><P
+>This option only applies to certain EP7312 hardware, not all EP7312 boards
+support it. Do not select 90MHz when building RedBoot or your eCos
+application unless you are absolutely sure that your board supports it.</P
+><P
+>If you do have a 90MHz board and wish to execute at 90MHz, it is in fact
+not necessary to build RedBoot specially, if you build your eCos
+application configured for 90MHz. RedBoot will run at 72MHz and your
+application will run at 90MHz. If you do install a 90MHz RedBoot, then you
+must build eCos for 90MHz or timing and baud rates on serial I/O will be
+wrong.</P
+><P
+>In other words, code (either eCos app or RedBoot) built for 90MHz will
+“change up a gear” when it starts up; but code built for 72MHz,
+because it needs to run correctly on boards without the
+“gearbox” does not change back down, so if you mix the two,
+unexpected timing can result. To run a non-eCos application without any
+hardware initialization code at 90MHz, you must install a specially-built
+RedBoot.</P
+></DIV
+></DIV
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+>Cirrus Logic ARM EP7212 Development Board
+Hardware Setup</TD
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+>
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