CC2541: OAD: CRC mismatch between linker (IAR) and BIM

Niraj Kumar Mahapatro

Part Number: CC2541

Hello,

I am trying to implement OAD with the default images sizes and linker files provided in stack "BLE-CC254x-1.4.2.2". I write the BIM to flash using debug option in IAR then I write the ImageA into flash using debug option in IAR. cc2541 goes into sleep mode because the CRC calculated by BIM (crc[1]) doesn't match with CRC calculated by IAR (crc[0]).

Can you please help in debugging this?

The details of the setup is as below

bim_main.c constants

/* ------------------------------------------------------------------------------------------------
 *                                          Constants
 * ------------------------------------------------------------------------------------------------
 */

#define BIM_IMG_A_PAGE        1
#define BIM_IMG_A_AREA        62

#define BIM_IMG_B_PAGE        8
#define BIM_IMG_B_AREA       (124 - BIM_IMG_A_AREA)

#define BIM_CRC_OSET          0x00
#define BIM_HDR_OSET          0x00

oad_target.h constants

/*********************************************************************
 * CONSTANTS
 */

#if !defined OAD_IMG_A_PAGE
#define OAD_IMG_A_PAGE        1
#define OAD_IMG_A_AREA        62
#endif

#if !defined OAD_IMG_B_PAGE
// Image-A/B can be very differently sized areas when implementing BIM vice OAD boot loader.
#if defined FEATURE_OAD_BIM
#define OAD_IMG_B_PAGE        8
#else
#define OAD_IMG_B_PAGE        63
#endif
#define OAD_IMG_B_AREA       (124 - OAD_IMG_A_AREA)
#endif

Please let me know if any other info is required.

over 7 years ago

0 JXS over 7 years ago

TI__Guru** 105180 points

Hi Niraj,

Can you add the changes suggested by this post: e2e.ti.com/.../1939005

Best wishes

0 Niraj Kumar Mahapatro over 7 years ago in reply to JXS

Prodigy 230 points

Thanks JKS for the response.

I tried that without any success.

On further debug, I found that the image header is not present in the flash. This seems to be a linker issue.

The following is the extract from oad_target.c

#pragma location="IMAGE_HEADER"
const __code img_hdr_t _imgHdr = {
#if defined FEATURE_OAD_SECURE
  2012,                       // CRC must not be 0x0000 or 0xFFFF.
#endif
#if defined (BOOTP_E_IMAGE_A)
#warning "Forcing a CRC-shadow match with the BOOTP_E_IMAGE_A flag - is this bootstrap code?"
  2012,                       // CRC-shadow forced to match CRC for a bootstrap Encrypted Image-A
#else
  0xFFFF,                     // CRC-shadow must be 0xFFFF for everything else
#endif
  OAD_IMG_VER( OAD_IMAGE_VERSION ), // 15-bit Version #, left-shifted 1; OR with Image-B/Not-A bit.
  OAD_IMG_R_AREA * OAD_FLASH_PAGE_MULT,
#if defined HAL_IMAGE_A
  OAD_IMAGE_A_USER_ID,        // User-Id
#else
  OAD_IMAGE_B_USER_ID,        // User-Id
#endif
  { OAD_MAJOR_VER, OAD_MINOR_VER, OAD_REVISION, 0xFF }  // Reserved
};
#pragma required=_imgHdr

#pragma location="AES_HEADER"
static const __code aes_hdr_t _aesHdr = {
 { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF },
 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B },  // Dummy Nonce
 { 0xFF, 0xFF, 0xFF, 0xFF }   // Spare
};
#pragma required=_aesHdr

The following is the flash read while CRC calculation.

The first two byte are the CRC calculated by IAR and placed at the beginning of page-1 of flash. But the next bytes where the IMAGE_HEADER and AES_HEADER should be present are all 0xFF.

I can observe the rest of the code is present at from 48th byte. (0x0830). Can you help me figure out why the Image header is missing in the flash.

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CC2541: OAD: CRC mismatch between linker (IAR) and BIM