xref: /openbmc/u-boot/doc/README.plan9 (revision 87e29878)
1Plan 9 from Bell Labs kernel images require additional setup to pass
2configuration information to the kernel.  An environment variable named
3confaddr must be defined with the same value as CONFADDR (see mem.h).
4Use of this facility is optional, but should be preferable to manual
5configuration.
6
7When booting an image, arguments supplied to the bootm command will be
8copied to CONFADDR.  If no arguments are specified, the contents of the
9bootargs environment variable will be copied.
10
11If no command line arguments or bootargs are defined, CONFADDR is left
12uninitialized to permit manual configuration.  For example, PC-style
13configuration could be simulated by issuing a fatload in bootcmd:
14
15  # setenv bootcmd fatload mmc 0 $confaddr plan9.ini; ...; bootm
16
17Steven Stallion
18June 2013
19