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Add support to disable cpu's in multicore processors

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Add a disable sub-command to the cpu command that allows for disabling
cores in multicore processors.  This can be useful for systems that are
using multicore chips but aren't utilizing all the cores as a way to
reduce power and possibly improve performance.

Also updated an added missing copyright.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala
2010-01-12 11:42:43 -06:00
parent 797312a15e
commit 4194b3668a
4 changed files with 39 additions and 1 deletions
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3
common/cmd_mp.c
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@@ -46,6 +46,8 @@ cpu_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
cpu_reset(cpuid);
} else if (strncmp(argv[2], "status", 6) == 0) {
cpu_status(cpuid);
} else if (strncmp(argv[2], "disable", 7) == 0) {
return cpu_disable(cpuid);
} else {
cmd_usage(cmdtp);
return 1;
@@ -86,6 +88,7 @@ U_BOOT_CMD(
"Multiprocessor CPU boot manipulation and release",
"<num> reset - Reset cpu <num>\n"
"cpu <num> status - Status of cpu <num>\n"
"cpu <num> disable - Disable cpu <num>\n"
"cpu <num> release <addr> [args] - Release cpu <num> at <addr> with [args]"
#ifdef CPU_ARCH_HELP
"\n"