Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

RE: Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

NoahPendleton — Thu, 30 Apr 2026 18:05:06 GMT

Partition manager will no longer be supported in future NCS versions, so we haven't invested in mimic'ing the `MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP` partition manager scheme in `MEMFAULT_COREDUMP_STORAGE_RRAM` - either fixed partition or device-tree specified partition is how it can be used.

More to your point, it would be nice to have this work better out-of-the-box, I'll work on that!

Thanks,
Noah

RE: Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

Natasha_C — Thu, 30 Apr 2026 17:41:49 GMT

Hi Andrew,

Here's the current recommended path:

Persistent Coredump Storage on nRF54L15

Do not use CONFIG_MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP=y on nRF54L15 — it will fail to compile because the nRF54L series uses RRAMC, not NVMC.

Use `CONFIG_MEMFAULT_COREDUMP_STORAGE_RRAM=y` instead

This is the supported path for nRF54L series. In your prj.conf:

CONFIG_MEMFAULT_COREDUMP_STORAGE_RRAM=y

⚠️ If you're on SDK ≥ 1.38.0, the symbol was renamed — use CONFIG_MEMFAULT_COREDUMP_STORAGE_NRF_RRAM=y instead. [SDK Changelog]

Define the partition

You need a partition named memfault_coredump_partition. You have two options:

Option A: Device tree fixed partition overlay (supported since SDK v1.30.3, no partition manager required) [SDK Changelog]

Add an overlay file for your board defining a memfault_coredump_partition in RRAM.

Option B: pm_static.yml (partition manager)

Add a memfault_coredump_partition entry to your static partition map.

Given that nRF54L15 has 1524 KB of RRAM vs. only 188 KB of SRAM, using RRAM for coredump storage is strongly preferable — it avoids consuming ~4% of your SRAM and also captures crashes from devices that lose power before uploading.

Thanks,

RE: Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

Andrew Ong — Wed, 29 Apr 2026 00:46:48 GMT

I added Memfault to my project today and I got

Not all memory regions collected. Coredump storage too small. Review the docs at mflt.io/mcu-coredump-memory-regions for more info.

So now I would like RRAM/Flash storage more.

Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

RE: Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

RE: Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

Persistent Coredump Storage on nRF54L15

Use CONFIG_MEMFAULT_COREDUMP_STORAGE_RRAM=y instead

Define the partition

RE: Persistent coredump storage on nRF54L15 — MEMFAULT_NCS_INTERNAL_FLASH_BACKED_COREDUMP not supported?

Use `CONFIG_MEMFAULT_COREDUMP_STORAGE_RRAM=y` instead