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12 >Cirrus Logic ARM EP7312 Development Board
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20 TITLE="eCos User Guide"
21 HREF="ecos-user-guide.html"><LINK
24 HREF="appendix-target-setup.html"><LINK
26 TITLE="Cirrus Logic ARM EP7212 Development Board
28 HREF="setup-arm-ep7212.html"><LINK
30 TITLE="Cirrus Logic ARM EP7209 Development Board Hardware Setup"
31 HREF="setup-arm-ep7209.html"></HEAD
42 SUMMARY="Header navigation table"
59 HREF="setup-arm-ep7212.html"
67 >Appendix A. Target Setup</TD
73 HREF="setup-arm-ep7209.html"
87 NAME="SETUP-ARM-EP7312">Cirrus Logic ARM EP7312 Development Board
90 >The Cirrus Logic EP7312 Development Board is similar
91 to the EP7212 Development Board from a hardware setup viewpoint,
92 and is based on the same port of eCos.</P
94 >When rebuilding the RedBoot ROM image or an eCos application,
95 change the "Cirrus Logic processor variant" option
96 (CYGHWR_HAL_ARM_EDB7XXX_VARIANT)
97 from the EP7211 to the EP7312. This can be selected in the
102 >eCos Configuration Tool</I
105 , or if using ecosconfig, can be set by uncommenting the user_value
106 property of this option in ecos.ecc and setting it to "EP7312".</P
108 >See the RedBoot documentation for building and installing RedBoot for this
109 target. Only RedBoot is supported as a boot image; ROMRAM startup is
116 NAME="EP7312-90MHZ-OPERATION">90MHz Operation</H2
118 >The EP7xxx targets offer a choice of clock speeds, from 18MHz to a maximum,
119 normally, of 72MHz. These are described as kHz values 18432 36864 49152
120 and 73728 within the configuration tool. If you have a release which
121 supports it, you will also see 90317 as an available option here, for 90MHz
124 >This option only applies to certain EP7312 hardware, not all EP7312 boards
125 support it. Do not select 90MHz when building RedBoot or your eCos
126 application unless you are absolutely sure that your board supports it.</P
128 >If you do have a 90MHz board and wish to execute at 90MHz, it is in fact
129 not necessary to build RedBoot specially, if you build your eCos
130 application configured for 90MHz. RedBoot will run at 72MHz and your
131 application will run at 90MHz. If you do install a 90MHz RedBoot, then you
132 must build eCos for 90MHz or timing and baud rates on serial I/O will be
135 >In other words, code (either eCos app or RedBoot) built for 90MHz will
136 “change up a gear” when it starts up; but code built for 72MHz,
137 because it needs to run correctly on boards without the
138 “gearbox” does not change back down, so if you mix the two,
139 unexpected timing can result. To run a non-eCos application without any
140 hardware initialization code at 90MHz, you must install a specially-built
149 SUMMARY="Footer navigation table"
160 HREF="setup-arm-ep7212.html"
169 HREF="ecos-user-guide.html"
178 HREF="setup-arm-ep7209.html"
188 >Cirrus Logic ARM EP7212 Development Board
195 HREF="appendix-target-setup.html"
203 >Cirrus Logic ARM EP7209 Development Board Hardware Setup</TD