[LinuxBIOS] Help with meaning of config options.
marc.jones at amd.com
Tue Dec 4 18:18:09 CET 2007
Steve Isaacs wrote:
> When I look at the options passed to the compiler on the command line I
> see the following:
> -DCONFIG_MAX_CPUS='4' -DCONFIG_MAX_PHYSICAL_CPUS='2'
> Can someone help me understand what the difference between these is? I'm
> working with two dual core opterons and this doesn't seem right to me.
CONFIG_MAX_CPUS : Saves space in the ACPI tables and additional stack
space for maximum possible number of cores in the system. Might be
better named as CONFIG_MAX_CPUs_CORES (AMD only)
CONFIG_MAX_PHYSICAL_CPUS: Used to set memory SPD addresses and in
coherent HyperTransport initialization (AMD only)
CONFIG_LOGICAL_CPUS : This is the flag to build in multi-core support.
Similar to CONFIG_MAX_CPUS but only set to 0 or 1. (Used by AMD and
CONFIG_MAX_CPUS : 4 - 4 cores
CONFIG_MAX_PHYSICAL_CPUS: 2 - 2 CPUs
CONFIG_LOGICAL_CPUS : 1 - build multi core support in.
Senior Firmware Engineer
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mailto:Marc.Jones at amd.com
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