Documentation: x86 Enable Serial Output
Document the steps necessary to enable serial output TEST=None Change-Id: Ifc0e700d7ef54fb1e28ca9bca34b94cccd3633ac Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com> Reviewed-on: https://review.coreboot.org/13444 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>
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@@ -14,6 +14,7 @@
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</p>
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<ol>
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<li><a href="#RequiredFiles">Required Files</a></li>
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<li>Enable <a href="#SerialOutput">Serial Output</a></li>
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</ol>
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@@ -77,6 +78,30 @@
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</ol>
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<hr>
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<h1><a name="SerialOutput">Enable Serial Output</a></h1>
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<p>
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Use the following steps to enable serial output:
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</p>
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<ol>
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<li>Implement the car_mainboard_pre_console_init routine in the com_init.c
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file:
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<ol type="A">
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<li>Power on and enable the UART controller</li>
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<li>Connect the UART receive and transmit data lines to the
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appropriate SoC pins
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</li>
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</ol>
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</li>
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<li>Add Makefile.inc
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<ol type="A">
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<li>Add com_init.c to romstage</li>
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</ol>
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</li>
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</ol>
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<hr>
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<p>Modified: 31 January 2016</p>
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</body>
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