ASR_BASE
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+Plan 9 from Bell Labs kernel images require additional setup to pass
+configuration information to the kernel. An environment variable named
+confaddr must be defined with the same value as CONFADDR (see mem.h).
+Use of this facility is optional, but should be preferable to manual
+configuration.
+
+When booting an image, arguments supplied to the bootm command will be
+copied to CONFADDR. If no arguments are specified, the contents of the
+bootargs environment variable will be copied.
+
+If no command line arguments or bootargs are defined, CONFADDR is left
+uninitialized to permit manual configuration. For example, PC-style
+configuration could be simulated by issuing a fatload in bootcmd:
+
+ # setenv bootcmd fatload mmc 0 $confaddr plan9.ini; ...; bootm
+
+Steven Stallion
+June 2013