Thingy91:x nRF5340 does not boot with external flashhttps://devzone.nordicsemi.com/f/nordic-q-a/122476/thingy91-x-nrf5340-does-not-boot-with-external-flashHello, I am trying to build a firmware for the nRF5340 on the Thingy91:x. The firmware should use the external flash for the secondary Image and is using the chained bootload setup with NSIB -&gt; MCUboot -&gt; App-Firmware. Unfortunately my bootloader encountersen-USTelligent Community 13Wed, 02 Jul 2025 15:28:33 GMTRE: Thingy91:x nRF5340 does not boot with external flashhttps://devzone.nordicsemi.com/thread/541202?ContentTypeID=1Wed, 02 Jul 2025 15:28:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:82dd294b-658a-4f3b-9b81-d1cc5f2a4b53rothmajs<p>I have found the solution. My nrf9151 on the thingy was running the serial-lte-modem firmware, which was also using the spi-bus and accessing the flash.<br />After mass-erasing the nrf9151 the bootloader does not encounter the BUS_FAULT anymore.<br /><br /><pre class="ui-code" data-mode="text">D: stack 0x2005c1b0 for thread 0x200027e0: obj_size=20240 buf_start=0x2005c1b0 buf_size 20240 stack_ptr=0x200610c0 D: stack 0x2005c070 for thread 0x20002760: obj_size=320 buf_start=0x2005c070 buf_size 320 stack_ptr=0x2005c1b0 D: Event: LFCLK_STARTED D: lfclk: Clock started I: Function: nrfx_spim_init, error code: NRFX_SUCCESS. D: tx_bufs 0x20060fc8 - rx_bufs 0 - 1 D: current_tx 0x20060fd8 (1), current_rx 0 (0), tx buf/len 0x20060fc0/1, rx buf/len 0/0 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: thread 0x200027e0 for 33 ticks D: tx_bufs 0x20060fd0 - rx_bufs 0x20060fd8 - 1 D: current_tx 0x20060fe0 (2), current_rx 0x20060fe0 (2), tx buf/len 0x20060fc8/1, rx buf/len 0x20060fc8/1 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20061017/1 D: rx buf/len 0x20061017/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060fe8 - rx_bufs 0x20060ff0 - 1 D: current_tx 0x20060ff8 (2), current_rx 0x20060ff8 (2), tx buf/len 0x20060fe0/1, rx buf/len 0x20060fe0/1 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20061030/3 D: rx buf/len 0x20061030/3 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: GD25LE255E@0: 32 MiBy flash D: Erase 4096 with 20 D: Erase 32768 with 52 D: Erase 65536 with d8 D: Page size 256 bytes D: Checking enter-4byte-addr 01 D: tx_bufs 0x20060fe8 - rx_bufs 0 - 1 D: current_tx 0x20060ff8 (1), current_rx 0 (0), tx buf/len 0x20060fe0/1, rx buf/len 0/0 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060fe8 - rx_bufs 0 - 1 D: current_tx 0x20060ff8 (1), current_rx 0 (0), tx buf/len 0x20060fe0/1, rx buf/len 0/0 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: thread 0x200027e0 for 33 ticks D: tx_bufs 0x20060fc8 - rx_bufs 0 - 1 D: current_tx 0x20060fd8 (1), current_rx 0 (0), tx buf/len 0x20060fc0/1, rx buf/len 0/0 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: thread 0x200027e0 for 33 ticks *** Booting My Application v2.1.0-dev-ae1ee57f3906 *** *** Using nRF Connect SDK v3.0.0-3bfc46578e42 *** *** Using Zephyr OS v4.0.99-a0e545cb437a *** D: scheduler unlocked (0x200027e0:0) I: Starting bootloader D: tx_bufs 0x20060f38 - rx_bufs 0x20060f40 - 1 D: current_tx 0x20060f48 (2), current_rx 0x20060f48 (2), tx buf/len 0x20060f30/5, rx buf/len 0x20060f30/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x2001ad30/32 D: rx buf/len 0x2001ad30/32 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3 D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f68/16 D: rx buf/len 0x20060f68/16 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f67/1 D: rx buf/len 0x20060f67/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060ef8 - rx_bufs 0x20060f00 - 1 D: current_tx 0x20060f08 (2), current_rx 0x20060f08 (2), tx buf/len 0x20060ef0/5, rx buf/len 0x20060ef0/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fa2/1 D: rx buf/len 0x20060fa2/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060ef8 - rx_bufs 0x20060f00 - 1 D: current_tx 0x20060f08 (2), current_rx 0x20060f08 (2), tx buf/len 0x20060ef0/5, rx buf/len 0x20060ef0/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fa3/1 D: rx buf/len 0x20060fa3/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3 I: Boot source: none D: tx_bufs 0x20060f38 - rx_bufs 0x20060f40 - 1 D: current_tx 0x20060f48 (2), current_rx 0x20060f48 (2), tx buf/len 0x20060f30/5, rx buf/len 0x20060f30/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x2001ad30/32 D: rx buf/len 0x2001ad30/32 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f18 - rx_bufs 0x20060f20 - 1 D: current_tx 0x20060f28 (2), current_rx 0x20060f28 (2), tx buf/len 0x20060f10/5, rx buf/len 0x20060f10/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f78/16 D: rx buf/len 0x20060f78/16 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f18 - rx_bufs 0x20060f20 - 1 D: current_tx 0x20060f28 (2), current_rx 0x20060f28 (2), tx buf/len 0x20060f10/5, rx buf/len 0x20060f10/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f77/1 D: rx buf/len 0x20060f77/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fb2/1 D: rx buf/len 0x20060fb2/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fb3/1 D: rx buf/len 0x20060fb3/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Image index: 0, Swap type: none D: tx_bufs 0x20060f38 - rx_bufs 0x20060f40 - 1 D: current_tx 0x20060f48 (2), current_rx 0x20060f48 (2), tx buf/len 0x20060f30/5, rx buf/len 0x20060f30/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x2001ad88/32 D: rx buf/len 0x2001ad88/32 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3 D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f68/16 D: rx buf/len 0x20060f68/16 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f67/1 D: rx buf/len 0x20060f67/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060ef8 - rx_bufs 0x20060f00 - 1 D: current_tx 0x20060f08 (2), current_rx 0x20060f08 (2), tx buf/len 0x20060ef0/5, rx buf/len 0x20060ef0/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fa2/1 D: rx buf/len 0x20060fa2/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060ef8 - rx_bufs 0x20060f00 - 1 D: current_tx 0x20060f08 (2), current_rx 0x20060f08 (2), tx buf/len 0x20060ef0/5, rx buf/len 0x20060ef0/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fa3/1 D: rx buf/len 0x20060fa3/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3 I: Boot source: none D: tx_bufs 0x20060f38 - rx_bufs 0x20060f40 - 1 D: current_tx 0x20060f48 (2), current_rx 0x20060f48 (2), tx buf/len 0x20060f30/5, rx buf/len 0x20060f30/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x2001ad88/32 D: rx buf/len 0x2001ad88/32 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f18 - rx_bufs 0x20060f20 - 1 D: current_tx 0x20060f28 (2), current_rx 0x20060f28 (2), tx buf/len 0x20060f10/5, rx buf/len 0x20060f10/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f78/16 D: rx buf/len 0x20060f78/16 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f18 - rx_bufs 0x20060f20 - 1 D: current_tx 0x20060f28 (2), current_rx 0x20060f28 (2), tx buf/len 0x20060f10/5, rx buf/len 0x20060f10/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f77/1 D: rx buf/len 0x20060f77/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fb2/1 D: rx buf/len 0x20060fb2/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fb3/1 D: rx buf/len 0x20060fb3/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Image index: 1, Swap type: none D: tx_bufs 0x20060f38 - rx_bufs 0x20060f40 - 1 D: current_tx 0x20060f48 (2), current_rx 0x20060f48 (2), tx buf/len 0x20060f30/5, rx buf/len 0x20060f30/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x2001ade0/32 D: rx buf/len 0x2001ade0/32 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3 D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f68/16 D: rx buf/len 0x20060f68/16 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f67/1 D: rx buf/len 0x20060f67/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060ef8 - rx_bufs 0x20060f00 - 1 D: current_tx 0x20060f08 (2), current_rx 0x20060f08 (2), tx buf/len 0x20060ef0/5, rx buf/len 0x20060ef0/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fa2/1 D: rx buf/len 0x20060fa2/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060ef8 - rx_bufs 0x20060f00 - 1 D: current_tx 0x20060f08 (2), current_rx 0x20060f08 (2), tx buf/len 0x20060ef0/5, rx buf/len 0x20060ef0/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fa3/1 D: rx buf/len 0x20060fa3/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3 I: Boot source: none D: tx_bufs 0x20060f38 - rx_bufs 0x20060f40 - 1 D: current_tx 0x20060f48 (2), current_rx 0x20060f48 (2), tx buf/len 0x20060f30/5, rx buf/len 0x20060f30/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x2001ade0/32 D: rx buf/len 0x2001ade0/32 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f18 - rx_bufs 0x20060f20 - 1 D: current_tx 0x20060f28 (2), current_rx 0x20060f28 (2), tx buf/len 0x20060f10/5, rx buf/len 0x20060f10/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f78/16 D: rx buf/len 0x20060f78/16 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f18 - rx_bufs 0x20060f20 - 1 D: current_tx 0x20060f28 (2), current_rx 0x20060f28 (2), tx buf/len 0x20060f10/5, rx buf/len 0x20060f10/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060f77/1 D: rx buf/len 0x20060f77/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fb2/1 D: rx buf/len 0x20060fb2/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: tx_bufs 0x20060f08 - rx_bufs 0x20060f10 - 1 D: current_tx 0x20060f18 (2), current_rx 0x20060f18 (2), tx buf/len 0x20060f00/5, rx buf/len 0x20060f00/5 D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0x20060fb3/1 D: rx buf/len 0x20060fb3/1 I: Function: spim_xfer, error code: NRFX_SUCCESS. D: Event: NRF_SPIM_EVENT_END. D: tx buf/len 0/0 D: rx buf/len 0/0 D: Transaction finished with status 0 I: Function: spim_xfer, error code: NRFX_SUCCESS. I: Image index: 2, Swap type: none I: Bootloader chainload address offset: 0x30000 I: Image version: v0.0.0 I: Jumping to the first image slot</pre><br /><br />Now I will try to modify the serial-lte-modem firmware to work without the flash.</p><div style="clear:both;"></div>RE: Thingy91:x nRF5340 does not boot with external flashhttps://devzone.nordicsemi.com/thread/540967?ContentTypeID=1Tue, 01 Jul 2025 07:11:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e029c8d7-2e7b-4998-9bd2-09fdd37f5172Hakon[quote user="rothmajs"]It is the pin labeled 22 on this board, which comes provided with the Thingy:[/quote] <p>Ahh, that makes sense. I don&#39;t have this right now, but I will try to find it somewhere (I just have the thingy itself atm).</p><div style="clear:both;"></div>RE: Thingy91:x nRF5340 does not boot with external flashhttps://devzone.nordicsemi.com/thread/540958?ContentTypeID=1Tue, 01 Jul 2025 06:33:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:62f9ca17-6047-4520-be3b-5616ca491175rothmajs[quote userid="73166" url="~/f/nordic-q-a/122476/thingy91-x-nrf5340-does-not-boot-with-external-flash/540920"]Can you elaborate on this?[/quote] <p>It is the pin labeled 22 on this board, which comes provided with the Thingy:</p> <p>&nbsp;<img style="max-height:240px;max-width:320px;" alt=" " src="https://docs-be.nordicsemi.com/bundle/ug_thingy91x/page/UG/thingy91x/hw_description/images/thingy91x_meas_board_front.svg?_LANG=enus" /></p> <p><br />I configured MCUboot to print out it&#39;s log via uart on this pin (this is how I got the logs as seen in my original post).</p><div style="clear:both;"></div>RE: Thingy91:x nRF5340 does not boot with external flashhttps://devzone.nordicsemi.com/thread/540920?ContentTypeID=1Mon, 30 Jun 2025 15:53:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:83f94281-9327-4a12-9ff1-359927b49f4dHakon[quote user="rothmajs"]I replaced the file. It apparently broke, when i inserted my edit.[/quote] <p>Okay great, it works now.</p> [quote user=""]UART logs (tx) are available on Pin22 of the thingy-debug-board in my minimal example[/quote] <p>Can you elaborate on this?</p><div style="clear:both;"></div>RE: Thingy91:x nRF5340 does not boot with external flashhttps://devzone.nordicsemi.com/thread/540476?ContentTypeID=1Wed, 25 Jun 2025 12:06:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dfd25d37-bf24-4629-bfcb-9ce0d238b4bdrothmajs<p>Hi Hakon,</p> <p>I replaced the file. It apparently broke, when i inserted my edit.<br /><br /></p><div style="clear:both;"></div>RE: Thingy91:x nRF5340 does not boot with external flashhttps://devzone.nordicsemi.com/thread/540449?ContentTypeID=1Wed, 25 Jun 2025 10:28:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b414e272-a078-43ed-823f-a4b2331d70a2Hakon<p>Hello,</p> <p>can you share your app directory again? I can&#39;t access it.</p><div style="clear:both;"></div>