DocID024590 Rev 3

21/25

AN4296

Execute application code from CCM RAM using a GNU-based toolchain

24

b

LoopCopyDataInit1

CopyDataInit1:

ldr

r3, =_siccmram

ldr

r3, [r3, r1]

str

r3, [r0, r1]

adds

r1, r1, #4

LoopCopyDataInit1:

ldr

r0, =_sccmram

ldr

r3, =_eccmram

adds

r2, r0, r1

cmp

r2, r3

bcc

CopyDataInit1

ldr

r2, =_sbss

b

LoopFillZerobss

/* Zero fill the bss segment. */

FillZerobss:

movs

r3, #0

str

r3, [r2], #4

LoopFillZerobss:

ldr

r3, = _ebss

cmp

r2, r3

bcc

FillZerobss

/* Call the clock system intitialization function.*/

bl

SystemInit

/* Call the application's entry point.*/

bl

main

bx

lr

4.

Place the part of code to be executed from CCM RAM in the .ccmram section by

adding the attribute key word in the function prototype:

Figure 19. GNU function placement