bootloader without Softdevice

[wiz_yoo]

Dear Nordic.

I am developing bootloader without SD (s120_nrf51822_1.0.1). And after execution of bootloader, jump to application working with SD.

Flash composed like below.

• SD is placed into 0x0000 (size: 0x18000)
• Bootloader is placed into 0x18000 (size: 0x5000)
• Application is placed into 0x20000 (size:0x10000)

RAM used like below.

• Bootloader working without SD. (0x1000 ~ 0x4000)
• Application working with SD. (0x2800 ~ 0x4000)

I modified code from sample: nrf51822_v4.4 - Bootloader_Without_SD.

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Below means, code for jump to [CODE_REGION_1_START] after reset ?

LDR R2, =CODE_REGION_1_START;

MRS    R0, PSR ;
/* Mask the interrupt number only */
MOVS   R1, #0x3F  ; 
ANDS   R0, R1     ; /*R0 keeps the interrupt number*/
extern bootloader_active;
LDR R1 , =bootloader_active;
LDR R2, [R1];
CMP R2,#1;
///////////////////////////////////
LDR     R2, =CODE_REGION_1_START; // <- this code
///////////////////////////////////
/* Irq address position = IRQ No * 4 */
LSLS   R0, R0, #2 ;
/* Fetch the user vector offset */
LDR    R0, [R0, R2];
/* Jump to user interrupt vector */
BX     R0  ;

And could I use RAM (0x1000 ~ 0x3000), before softdevice is enabled ?

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Best and regards.

[wiz_yoo]

Thanks for your help. I'll check GitHub repo. I using s120_nrf51822_1.0.1 (SDK version is 7.1.0).