MCUBOOT on nRF54L15: Can not FPROTECT region that big

[Fridtjof]

I'm working on a project for the nRF54L15. Until now I have not been using mcuboot, but since I added SB_CONFIG_BOOTLOADER_MCUBOOT=y to my sysbuild.conf, I get an error when building MCUBOOT:

error: static assertion failed: "Can not FPROTECT region that big"
   87 | #define BUILD_ASSERT(EXPR, MSG...) _Static_assert((EXPR), "" MSG)
      |                                    ^~~~~~~~~~~~~~

I found some old posts which recommended looking at partition manager and creating a pm_static, but partition manager was just deprecated so I want to use the device tree. How do I get rid of this build error?

[Fridtjof]

I finally solved my issue. The problem was that my custom board has no low-frequency crystal oscillator connected, so we rely on the internal oscillator. I already had CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y in my prj.conf, but mcuboot was still trying to use an external oscillator, which is the default. So I simply added

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

to sysbuild/mcuboot.conf.

[Vidar Berg]

I'm glad you found the issue, thank you for the update.