Value of ''__initial_sp''

Posted on December 11, 2017 at 13:30

Hello ,

I am new to ARM cortex M processors and while doing some coding on my board using KEIL  i found that

at location 0x0000_0000 my debugger shows the value '0x2000_0660' . Thats the value of the MSP loaded.

but i really dont understand how linker arrived at that value using __initial_sp

i checked in the startup file and found this

; Amount of memory (in bytes) allocated for Stack

; Tailor this value to your application needs

; <h> Stack Configuration

; <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>

; </h>

Stack_Size EQU 0x00000400

AREA STACK, NOINIT, READWRITE, ALIGN=3

Stack_Mem SPACE Stack_Size

__initial_sp

How this turns out to be __initial_sp = 0x2000_0660 ???

#cortex-m3 #keil-mdk5 #stm32-f4