first DFU test failed to pre-validate

[paul_tanner]

SDK 12.3, pca10040 and armgcc

Built bootloader_secure (debug version) and flashed it.

Loading appears to take place but nothing showing on RTT console afterwards.

Then flashed it again. Appeared to flash OK this time.

Now the RTT viewer shows:

:INFO:Inside main
:INFO:In nrf_bootloader_init
:INFO:In real nrf_dfu_init
:INFO:running nrf_dfu_settings_init
:INFO:Enter nrf_dfu_continue
:INFO:Single: Invalid bank
:INFO:Enter nrf_dfu_app_is_valid
:INFO:Return false in valid app check
:INFO:In nrf_dfu_transports_init
:INFO:num transports: 1
:INFO:vector table: 0x00075000
SDH:WARNING:sd_ble_enable: RAM start should be adjusted to 0x20002798
SDH:WARNING:RAM size should be adjusted to 0xd868 
:INFO:Waiting for events

If I hit reset button I get the above again.

Fired up nRF Toolbox on Android 7.0

Selected zip file dfu_test_app_hrm_s132 (from SDK 12.2)

Console says:

:INFO:Received select object
:INFO:Valid Command: NRF_DFU_OBJECT_OP_SELECT
:INFO:Sending Object Info: [0x60, 0x06, 0x01 max: 0:x00000100 0:x00000000, CRC:0x00000000]
:INFO:Set receipt notif
:INFO:Sending Response: [0x2, 0x1]
:INFO:Received create object
:INFO:Before OP create command
:INFO:Valid Command Create
:INFO:Sending Response: [0x1, 0x1]
:INFO:Before OP write command
:INFO:Before OP write command
:INFO:Before OP write command
:INFO:Before OP write command
:INFO:Before OP write command
:INFO:Before OP write command
:INFO:Before OP write command
:INFO:Received calculate CRC
:INFO:Valid Command CRC
:INFO:Sending CRC: [0x60, 0x03, 0x01, 0:x0000008a, CRC:0xad48567a]
:INFO:Received execute object
:INFO:Before OP execute command
:INFO:Valid command execute
:INFO:
12 87 01 0A 41 08 01 12 3D 08 01 10 34 1A 05 8C  ....A...=...4...
01 FE 95 03 20 00 28 00 30 00 38 B8 F8 01 42 24  .... .(.0.8...B$
08 03 12 20 EC 6D 22 99 8F D9 84 C8 2A 26 3D DE  ... .m".....*&=.
C0 E4 EE F1 43 51 85 FD FE 0B 96 8F 62 2B 07 D8  ....CQ......b+..
56 EF CE 07 48 01 10 00 1A 40 A5 3E 6B 02 29 8A  V...H....@.>k.).
A5 35 D8 39 C8 70 53 E8 72 A5 A1 B1 E8 D4 40 8C  .5.9.pS.r.....@.
:INFO:
:INFO:Prevalidate FAILED!
:INFO:Sending Response: [0x4, 0x5]

Repeated the last steps. Same effect.

Could this be because I tried to use the pre-built .zip file from SDK 12.2? (I have not touched any key pairs yet.)

Now I was not able to go back to flashing my examples in the usual way (via J-Link). This problem went away after I did

 nrfjprog -f nrf52 -e

[bjorn-spockeli]

Hi Paul,

each SDK version will use different public-private key pairs, so you will not be able to perform a DFU with the bootloader from SDK v12.3.0 using a test image from SDK v12.2.0.

You have to use the test images from the same SDK version or generate your firmware image with your own public-private key pair, see this guide.

[paul_tanner]

Thx @Bjørn I have now generated a new key pair and image but after loading it did not start. (I looked for a sample image in the 12.3 SDK but did not find it.)

Restarted DFU and selected my new image .zip. The final lines of debug were:

...
:INFO:Enter nrf_dfu_app_is_valid
:INFO:Return true. App was valid
:INFO:Enter nrf_dfu_app_is_valid
:INFO:Return true. App was valid
:INFO:Jumping to: 0x0001f000
:INFO:Running nrf_bootloader_app_start with address: 0x0001f000
:INFO:Disabling interrupts
:INFO:Setting SD vector table base: 0x0001f000

After this it hung, presumably waiting for another DFU. The reset button did not start the downloaded app. I was able to start it with J-Link so the loading worked. However, I had been expecting the downloaded app to start automatically.

Is there something missing from the zipped image?