1. Purpose
This article explains how to switch from a SMP (symmetric multiprocessing) Linux® kernel configuration to a UP (uniprocessor) Linux kernel configuration.
2. Rationale
Considering that STMicroelectronics Linux kernel is configured in SMP mode by default, single Arm Cortex-A core users may wish to disable this configuration in order to avoid trying to start the second core at every boot. Please note that keeping the SMP mode enabled on a single processor does not have any performance impact on the kernel in most use cases, so this change is not mandatory.
3. Modify kernel configuration
To switch to UP configuration, disable SMP configuration. To do that, search SMP in kernel menuconfig and disable the option.