diff options
Diffstat (limited to 'stm/startup_stm32f40xx.s')
| -rw-r--r-- | stm/startup_stm32f40xx.s | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/stm/startup_stm32f40xx.s b/stm/startup_stm32f40xx.s index 194ebac35..a9f21f0b0 100644 --- a/stm/startup_stm32f40xx.s +++ b/stm/startup_stm32f40xx.s @@ -72,6 +72,7 @@ defined in linker script */ Reset_Handler: /* Copy the data segment initializers from flash to SRAM */ +/* movs r1, #0 b LoopCopyDataInit @@ -87,9 +88,23 @@ LoopCopyDataInit: adds r2, r0, r1 cmp r2, r3 bcc CopyDataInit + */ + ldr r0, =_sidata @ source pointer + ldr r1, =_sdata @ destination pointer + ldr r2, =_edata @ maximum destination pointer + b data_init_entry +data_init_loop: + ldr r3, [r0], #4 + str r3, [r1], #4 +data_init_entry: + cmp r1, r2 + bcc data_init_loop + + +/* Zero fill the bss segment. */ + /* ldr r2, =_sbss b LoopFillZerobss -/* Zero fill the bss segment. */ FillZerobss: movs r3, #0 str r3, [r2], #4 @@ -98,6 +113,17 @@ LoopFillZerobss: ldr r3, = _ebss cmp r2, r3 bcc FillZerobss + */ + + movs r0, #0 @ source value + ldr r1, =_sbss @ destination pointer + ldr r2, =_ebss @ maximum destination pointer + b bss_init_entry +bss_init_loop: + str r0, [r1], #4 +bss_init_entry: + cmp r1, r2 + bcc bss_init_loop /* Call the clock system intitialization function.*/ bl SystemInit |