You can specify which CPU to bind processes to when launching processes from the startup script through the [CPU=] modifier.
The [CPU=] is used as any other modifier, and specifies the CPU on which to launch the following process (or, if the attribute is used alone on a line without a command, sets the default CPU for all following processes). Specify the CPU as a zero-based processor number:
[cpu=0] my_program
A value of * allows the processes to run on all processors:
[cpu=*] my_program
At boot time, if there isn't a processor with the given index, a warning message is displayed, and the command is launched without any runmask restriction.