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samples: bluetooth: central_uart: sign nRF54LM20 Dongle image #27984

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c0b080d
samples: dfu: single_init: fix nRF54LM20 Dongle configuration
Damian-Nordic Apr 9, 2026
b3a6742
samples: bluetooth: central_uart: sign nRF54LM20 Dongle image
nvlsianpu Apr 3, 2026
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20 changes: 20 additions & 0 deletions samples/bluetooth/central_uart/nrf54lm20dongle_dfu_partitions.dtsi
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/*
* Copyright (c) 2026 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
*/

/* This file modifies RRAM partitioning for MCUboot and firmware loader by
* extending slot0_partition (application image) to the end of RRAM.
*
* While the application may use extra partitions, such as storage_partition
* defined by default, this partitioning of application-dedicated region is
* irrelevant to the bootloader images.
*/
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@nordicjm nordicjm Apr 14, 2026

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this is false? I don't follow this, the pre-programmed bootloader will not allow you to write this

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@Damian-Nordic Damian-Nordic Apr 14, 2026

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This is not false according to @tomchy and @nvlsianpu. MCUBoot and firmware loader don't care whether the application uses all its region for the code or for data.

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@nordicjm nordicjm Apr 14, 2026

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I wrote the feature, neither of them did. Configuring hello_world for this board with MCUboot gives the following for MCUboot:

                                /* node '/soc/rram-controller@5004e000/rram@0/partitions' defined in nrf/boards/nordic/nrf54lm20dong>
                                partitions {
                                        compatible = "fixed-partitions"; /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_nrf>
                                        #address-cells = < 0x1 >;        /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_nrf>
                                        #size-cells = < 0x1 >;           /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_nrf>

                                        /* node '/soc/rram-controller@5004e000/rram@0/partitions/partition@0' defined in nrf/boards/>
                                        boot_partition: partition@0 {
                                                label = "mcuboot";    /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_nrf54l>
                                                reg = < 0x0 0x6000 >; /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_nrf54l>
                                        };

                                        /* node '/soc/rram-controller@5004e000/rram@0/partitions/partition@6000' defined in nrf/boar>
                                        slot1_partition: partition@6000 {
                                                label = "image-1";        /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_nr>
                                                reg = < 0x6000 0x1d000 >; /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_nr>
                                        };

                                        /* node '/soc/rram-controller@5004e000/rram@0/partitions/partition@23000' defined in nrf/boa>
                                        slot0_partition: partition@23000 {
                                                label = "image-0";          /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_>
                                                reg = < 0x23000 0x1ca000 >; /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_>
                                        };

                                        /* node '/soc/rram-controller@5004e000/rram@0/partitions/partition@1ed000' defined in nrf/bo>
                                        storage_partition: partition@1ed000 {
                                                label = "storage";          /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_>
                                                reg = < 0x1ed000 0x10000 >; /* in nrf/boards/nordic/nrf54lm20dongle/nrf54lm20dongle_>
                                        };
                                };

likewise the same for usb_mcumgr, and all that sample does is use MCUmgr's img mgmt which opens and writes to a partition, so unless the image build for the dongle is from an entirely different repo then their claim is false

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@Damian-Nordic Damian-Nordic Apr 15, 2026

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discussed f2f, the comment is not false per se, but the takeaway is that this layout should be configured by default in MCUboot and fw_loader for the dongle (not in the sample).


/delete-node/ &storage_partition;

&slot0_partition {
/* Start matches board layout */
reg = <0x23000 DT_SIZE_K(1896)>;
};
9 changes: 9 additions & 0 deletions samples/bluetooth/central_uart/sample.yaml
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Expand Up @@ -48,6 +48,15 @@ tests:
platform_allow:
- nrf5340dk/nrf5340/cpuapp
- nrf54h20dk/nrf54h20/cpuapp
sample.bluetooth.central_uart.bootloader:
sysbuild: true
build_only: true
extra_args:
- FILE_SUFFIX=bootloader
integration_platforms:
- nrf54lm20dongle/nrf54lm20b/cpuapp
platform_allow:
- nrf54lm20dongle/nrf54lm20b/cpuapp
sample.bluetooth.central_uart.llvm:
toolchain_allow: llvm
sysbuild: true
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15 changes: 15 additions & 0 deletions ...les/bluetooth/central_uart/sysbuild/mcuboot/boards/nrf54lm20dongle_nrf54lm20b_cpuapp.conf
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#
# Copyright (c) 2026 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
CONFIG_SYS_CLOCK_EXISTS=n
CONFIG_NRF_GRTC_TIMER=n
CONFIG_CRACEN_IKG=n
CONFIG_FPROTECT=y

# Disable run-time CRACEN provisioning of TRNG data.
# KMU slots 248, 249 shall be pre-provisioned while programming with secret TRNG values instead.
CONFIG_CRACEN_PROVISION_PROT_RAM_INV_SLOTS_ON_INIT=n

CONFIG_NRF_RRAM_WRITE_BUFFER_SIZE=32
14 changes: 14 additions & 0 deletions .../bluetooth/central_uart/sysbuild/mcuboot/boards/nrf54lm20dongle_nrf54lm20b_cpuapp.overlay
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/*
* Copyright (c) 2026 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
*/

/ {
chosen {
zephyr,code-partition = &boot_partition;
};
};

/* ensure same RRAM layout in firmware_loader as in MCUboot */
#include "../../../nrf54lm20dongle_dfu_partitions.dtsi"
47 changes: 47 additions & 0 deletions samples/bluetooth/central_uart/sysbuild/mcuboot/prj.conf
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#
# Copyright (c) 2026 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

CONFIG_BOOT_FIRMWARE_LOADER_ENTRANCE_GPIO=y
CONFIG_BOOT_FIRMWARE_LOADER_NO_APPLICATION=y

CONFIG_PM=n

CONFIG_MAIN_STACK_SIZE=10240

CONFIG_BOOT_SWAP_SAVE_ENCTLV=n
CONFIG_BOOT_ENCRYPT_IMAGE=n

CONFIG_BOOT_UPGRADE_ONLY=n
CONFIG_BOOT_BOOTSTRAP=n

CONFIG_FLASH=y
CONFIG_GPIO=y

### Decrease footprint by ~4 KB in comparison to CBPRINTF_COMPLETE=y
CONFIG_CBPRINTF_NANO=y
### Use picolibc to reduce flash usage
CONFIG_PICOLIBC=y
### Disable malloc arena because we don't need it
CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=0

# Reduce memory consumption
CONFIG_BOOT_BANNER=n
CONFIG_NCS_BOOT_BANNER=n
CONFIG_CLOCK_CONTROL=n
CONFIG_NRF_GRTC_START_SYSCOUNTER=n
CONFIG_SPI_NOR=n
CONFIG_SERIAL=n
CONFIG_CONSOLE=n
CONFIG_UART_CONSOLE=n
CONFIG_PRINTK=n
CONFIG_USE_SEGGER_RTT=n

# Activate Link Time Optimization (LTO)
CONFIG_LTO=y
CONFIG_ISR_TABLES_LOCAL_DECLARATION=y

# Improve debugging experience by disabling reset on fatal error
CONFIG_RESET_ON_FATAL_ERROR=n
5 changes: 5 additions & 0 deletions samples/bluetooth/central_uart/sysbuild/usb_mcumgr_bootloader.conf
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CONFIG_CDC_ACM_SERIAL_VID=0x1915
CONFIG_CDC_ACM_SERIAL_PID=0x541A
CONFIG_CDC_ACM_SERIAL_MANUFACTURER_STRING="Nordic Semiconductor ASA"
CONFIG_CDC_ACM_SERIAL_PRODUCT_STRING="nRF54LM20 Dongle Bootloader"
CONFIG_MCUMGR_GRP_ZBASIC_STORAGE_ERASE=n
21 changes: 21 additions & 0 deletions samples/bluetooth/central_uart/sysbuild/usb_mcumgr_bootloader.overlay
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/*
* Copyright (c) 2026 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
*/

/ {
chosen {
/delete-property/ zephyr,console;
/delete-property/ zephyr,shell-uart;
/delete-property/ zephyr,bt-mon-uart;
/delete-property/ zephyr,bt-c2h-uart;
};
};

&zephyr_udc0 {
/delete-node/ board_cdc_acm_uart;
};

/* ensure same RRAM layout in firmware_loader as in MCUboot */
#include "../nrf54lm20dongle_dfu_partitions.dtsi"
14 changes: 14 additions & 0 deletions samples/bluetooth/central_uart/sysbuild_bootloader.conf
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#
# Copyright (c) 2026 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

SB_CONFIG_BOOTLOADER_MCUBOOT=y
SB_CONFIG_MCUBOOT_MODE_FIRMWARE_UPDATER=y
SB_CONFIG_MCUBOOT_SIGNATURE_USING_KMU=y
SB_CONFIG_MCUBOOT_GENERATE_DEFAULT_KEY_FILE=y
SB_CONFIG_FIRMWARE_LOADER_IMAGE_USB_MCUMGR=y
SB_CONFIG_BOOT_SIGNATURE_TYPE_PURE=y

SB_CONFIG_MCUBOOT_MODE_FIRMWARE_UPDATER_BOOT_MODE_ENTRANCE=y
2 changes: 2 additions & 0 deletions samples/dfu/single_slot/sysbuild/usb_mcumgr_usb_enter_dongle.conf
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CONFIG_CDC_ACM_SERIAL_VID=0x1915
CONFIG_CDC_ACM_SERIAL_PID=0x541A
CONFIG_CDC_ACM_SERIAL_MANUFACTURER_STRING="Nordic Semiconductor ASA"
CONFIG_CDC_ACM_SERIAL_PRODUCT_STRING="nRF54LM20 Dongle Bootloader"
CONFIG_MCUMGR_GRP_ZBASIC_STORAGE_ERASE=n
8 changes: 0 additions & 8 deletions samples/dfu/single_slot/sysbuild/usb_mcumgr_usb_enter_dongle.overlay
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Expand Up @@ -10,20 +10,12 @@
/delete-property/ zephyr,shell-uart;
/delete-property/ zephyr,bt-mon-uart;
/delete-property/ zephyr,bt-c2h-uart;
zephyr,uart-mcumgr = &mcumgr_cdc_acm_uart0;
};
};

&zephyr_udc0 {
/delete-node/ board_cdc_acm_uart;
};

&zephyr_udc0 {
mcumgr_cdc_acm_uart0: mcumgr_cdc_acm_uart0 {
compatible = "zephyr,cdc-acm-uart";
label = "nRF54LM20 Dongle MCUmgr";
};
};

/* ensure same RRAM layout im firmware_loader as in MCUboot */
#include "../nrf54lm20dongle_dfu_partitions.dtsi"
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