sdk 12 bootloader erased after programming

Question

Hi, 
 I'm trying to load the secure_debug bootloader for the nrf52 with the SD 132 3.0 and an aplication.
But when I load the aplication the bootloader gets erased or overwritten...
I'm using Keil, and my process is:
1-Program the softdevice 3.
2-program the bootloader_debug with keil (using the external program nrfprog).
(At this point the bootloader appears on the nrfgo aplication...)
3-Program the aplication with Keil. 
 And the bootloader dissapears after the 3rd step. 
 I don't know what I'm doing wrong... 
 Thank you!

bjorn-spockeli · Accepted Answer

The IROM and IRAM settings for an application using the S132 v3.0.0 with no bootloader are: 
 IROM1 Start: 0x1F000 Size: 0x61000
IRAM1 Start: 0x20002128 Size: 0xDED8
 
 The Secure Bootloader start address is 0x78000 and 0x1F000 + 0x61000 = 0x80000 . Thus, you have to alter the application IROM settings so that the application does not overwrite the bootloader, i.e. 
 IROM1 Start: 0x1F000 Size: 0x59000
IRAM1 Start: 0x20002128 Size: 0xDED8
 
 If you're using GCC you have to alter the application linker script in the armgcc folder, i.e. 
 MEMORY
{
 FLASH (rx) : ORIGIN = 0x1f000, LENGTH = 0x59000
 RAM (rwx) : ORIGIN = 0x20002128, LENGTH = 0xded8
}
 
 
 EDIT 28.10.16: 
 Its another bug in the buttonless DFU example. It reserves a codepage at 0x7E000 for MBR parameters, which is not necessary and should not been added. The nRF52 flash algorithm in Keil will see this and perform a sector erase from 0x7F000 to 0x1F000 before flashing the application. 
 Thus, the entire section in nrf_dfu_settings.c may should be commented out. However, be sure that you do not compile the secure bootloader with this section commented out, as it also uses this file! 
 #if defined ( NRF52 )

/**@brief This variable reserves a codepage for mbr parameters, to ensure the compiler doesn't
 * locate any code or variables at his location.
 */
 
 
#if defined ( __CC_ARM )

 uint8_t m_mbr_params_page[CODE_PAGE_SIZE] __attribute__((at(NRF_MBR_PARAMS_PAGE_ADDRESS))) __attribute__((used));

#elif defined ( __GNUC__ )

 uint8_t m_mbr_params_page[CODE_PAGE_SIZE] __attribute__ ((section(".mbrParamsPage")));

#elif defined ( __ICCARM__ )

 __no_init uint8_t m_mbr_params_page[CODE_PAGE_SIZE] @ NRF_MBR_PARAMS_PAGE_ADDRESS;

#else

 #error Not a valid compiler/linker for m_mbr_params_page placement.

#endif


/**@brief This variable makes the linker script write the mbr parameters page address to the
 * UICR register. This value will be written in the HEX file and thus written to the
 * UICR when the bootloader is flashed into the chip.
 */
 
#if defined ( __CC_ARM )
 uint32_t m_uicr_mbr_params_page_address __attribute__((at(NRF_UICR_MBR_PARAMS_PAGE_ADDRESS)))
 = NRF_MBR_PARAMS_PAGE_ADDRESS;

#elif defined ( __GNUC__ )
 volatile uint32_t m_uicr_mbr_params_page_address __attribute__ ((section(".uicrMbrParamsPageAddress")))
 = NRF_MBR_PARAMS_PAGE_ADDRESS;
#elif defined ( __ICCARM__ )

 __root const uint32_t m_uicr_mbr_params_page_address @ NRF_UICR_MBR_PARAMS_PAGE_ADDRESS
 = NRF_MBR_PARAMS_PAGE_ADDRESS;

#else

 #error Not a valid compiler/linker for m_mbr_params_page placement.

#endif

#endif // defined ( NRF52 )

sdk 12 bootloader erased after programming

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