RTEMS 4.8.0 On-Line Library

Initialization Code bsp_start() - BSP Specific Initialization

BSP and Device Driver Development Guide

7.3.3: bsp_start() - BSP Specific Initialization

This is the first BSP specific C routine to execute during system initialization. This routine often performs required fundamental hardware initialization such as setting bus controller registers that do not have a direct impact on whether or not C code can execute. The source code for this routine is usually found in the following file:

c/src/lib/libbsp/CPU/BSP/startup/bspstart.c

This routine is also responsible for overriding the default settings in the CPU Configuration Table and setting port specific entries in this table. This may include increasing the maximum number of some types of RTEMS system objects to reflect the needs of the BSP and the base set of device drivers. This routine will typically also install routines for one or more of the following initialization hooks:

BSP Pretasking Hook
BSP Predriver Hook
BSP Postdriver Hook

One of the most important functions performed by this routine is determining where the RTEMS Workspace is to be located in memory. All RTEMS objects and task stacks will be allocated from this Workspace. The RTEMS Workspace is distinct from the application heap used for malloc(). Many BSPs place the RTEMS Workspace area at the end of RAM although this is certainly not a requirement.

After completing execution, this routine returns to the boot_card() routine.

BSP and Device Driver Development Guide