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This patch introduces support for command line arguments to Plan 9. Plan 9 generally dedicates a small region of kernel memory (known as CONFADDR) for runtime configuration. A new environment variable named confaddr was introduced to indicate this location when copying arguments. Signed-off-by: Steven Stallion <sstallion@gmail.com> [trini: Adapt for Simon's changes about correcting argc, no need to bump by 2 now] Signed-off-by: Tom Rini <trini@ti.com>
18 lines
785 B
Text
18 lines
785 B
Text
Plan 9 from Bell Labs kernel images require additional setup to pass
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configuration information to the kernel. An environment variable named
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confaddr must be defined with the same value as CONFADDR (see mem.h).
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Use of this facility is optional, but should be preferable to manual
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configuration.
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When booting an image, arguments supplied to the bootm command will be
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copied to CONFADDR. If no arguments are specified, the contents of the
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bootargs environment variable will be copied.
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If no command line arguments or bootargs are defined, CONFADDR is left
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uninitialized to permit manual configuration. For example, PC-style
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configuration could be simulated by issuing a fatload in bootcmd:
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# setenv bootcmd fatload mmc 0 $confaddr plan9.ini; ...; bootm
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Steven Stallion
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June 2013
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