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  • Case ID: 303886
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MCUBoot, Zephyr, and static partition manager

Roiger

Hi!
We are currently migrating our SD-based SDK code to Zephyr, on nrf52833 boards.

While we have finally been able to get MCUBoot (CONFIG_BOOTLOADER_MCUBOOT=y) to run with a static partition file, we consistently get the following log on runtime, and the app is never started:

00> *** Booting Zephyr OS build v3.2.99-ncs1 ***
00> I: Starting bootloader
00> W: Failed reading sectors; BOOT_MAX_IMG_SECTORS=128 - too small?
00> W: Cannot upgrade: not a compatible amount of sectors
00> E: Unable to find bootable image

I have a few questions regarding this:

  1. I have created the partition manager file (pm_static.yml) from the original build of our project, and added partitions to match our dts overlay (both are at bottom). The default setup causes s.t. the bootloader. which is much smaller than the default of 0xC000 = 48 KB for MCUboot, to sit apart from the mcuboot_pad and the app more than needed (see picture from nrfConnect Programmer below). What is the correct way to work with this?
  2. If I try to remove the mcuboot_pad totally, I consistently receive a failure of the static partition manager on build: "Partition manager failed: End of last partition is after last valid address". Why is this? Is the pad a must?
  3. In the default partition manager (As you can see below), alignment is consistently used ("align: start: 0x1000"). Is there a specific reason for this?
  4. The big one - what is the reason that the aforementioned mcuboot print is received?

Thanks ahead of time!

Roi

pm_static.yml:

app:
  address: 0xc200
  end_address: 0x3e000
  region: flash_primary
  size: 0x31e00
mcuboot:
  address: 0x0
  end_address: 0xc000
  placement:
    before:
    - mcuboot_primary
  region: flash_primary
  size: 0xc000
mcuboot_pad:
  address: 0xc000
  end_address: 0xc200
  placement:
    align:
      start: 0x1000
    before:
    - mcuboot_primary_app
  region: flash_primary
  size: 0x200
mcuboot_primary:
  address: 0xc000
  end_address: 0x3e000
  orig_span: &id001
  - mcuboot_pad
  - app
  region: flash_primary
  sharers: 0x1
  size: 0x32000
  span: *id001
mcuboot_primary_app:
  address: 0xc200
  end_address: 0x3e000
  orig_span: &id002
  - app
  region: flash_primary
  size: 0x31e00
  span: *id002
mcuboot_secondary:
  address: 0x3e000
  end_address: 0x70000
  placement:
    after:
    - mcuboot_primary
    align:
      start: 0x1000
  region: flash_primary
  share_size:
  - mcuboot_primary
  size: 0x32000
scratch_partition:
  address: 0x70000
  end_address: 0x7a000
  placement:
    align:
      start: 0x1000
  region: flash_primary
  size: 0xa000
settings_storage:
  address: 0x7a000
  end_address: 0x7c000
  placement:
    align:
      start: 0x1000
  region: flash_primary
  size: 0x2000
storage_partition:
  address: 0x7c000
  end_address: 0x80000
  placement:
    align:
      start: 0x1000
  region: flash_primary
  size: 0x4000
sram_primary:
  address: 0x20000000
  end_address: 0x20020000
  region: sram_primary
  size: 0x20000
dts overlay:
/delete-node/ &storage_partition;
&flash0 {

partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;

boot_partition: partition@0 {
label = "mcuboot";
reg = <0x00000000 0xC000>;
};
slot0_partition: partition@c000 {
label = "image-0";
reg = <0x0000C000 0x32000>;
};
slot1_partition: partition@3e000 {
label = "image-1";
reg = <0x0003E000 0x32000>;
};
scratch_partition: partition@70000 {
label = "image-scratch";
reg = <0x00070000 0xA000>;
};
settings_partition: partition@7a000 {
label = "settings";
reg = <0x0007A000 0x00002000>;
};
storage_partition: partition@7c000 {
label = "storage";
reg = <0x0007c000 0x00004000>;
};
};
};
mcuboot.conf (merged via edit to CMakeLists):
CONFIG_DISABLE_FLASH_PATCH=y
CONFIG_BOOT_SIGNATURE_KEY_FILE="/mcuboot/skey.pem"
CONFIG_UART_CONSOLE=n
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG=y
CONFIG_LOG_MODE_MINIMAL=y
CONFIG_PRINTK=n
CONFIG_LOG_PRINTK=n
CONFIG_STDOUT_CONSOLE=n
CONFIG_RTT_CONSOLE=y
CONFIG_BOOT_BANNER=y
CONFIG_USE_SEGGER_RTT=y
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