diff options
| author | Steven Stallion <sstallion@gmail.com> | 2013-06-10 01:00:09 -0700 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-06-26 10:25:22 -0400 |
| commit | eeaef5e4305497537bd47308724de39c7d6cbf19 (patch) | |
| tree | 213aef8f7119b74b9bbf7c4c9a1e0812c6ac26c9 /doc | |
| parent | 041bca5ba3adb48750d0a438cb3b1356a0c2e603 (diff) | |
cmd_bootm: Add command line arguments to Plan 9
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>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.plan9 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/README.plan9 b/doc/README.plan9 new file mode 100644 index 00000000000..2d3d0e0cf62 --- /dev/null +++ b/doc/README.plan9 @@ -0,0 +1,18 @@ +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 |