[nrf fromlist] mcumgr: Prevent FW loader from self-destruction #3617
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The FW loader reports and manages exactly two slots: - slot 0: this is the slot for the application code to update - slot 1: this is the slot, in which the FW loader is placed The slot 1 is reported, so tools can fetch metadata about the FW loader installed on the device. Unfortunately, currently SMP-based FW loader allows to issue slot erase command for the slot 1, effectively erasing the FW loader code that is being executed. This change correctly identifies the slot 1 as an active one, marking it as used and blocking erase operation on that slot. Upstream PR #: 100689 Signed-off-by: Tomasz Chyrowicz <[email protected]>
nvlsianpu
approved these changes
Dec 9, 2025
27 tasks
michalek-no
approved these changes
Dec 9, 2025
adsz-nordic
approved these changes
Dec 9, 2025
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The FW loader reports and manages exactly two slots:
The slot 1 is reported, so tools can fetch metadata about the FW loader installed on the device.
Unfortunately, currently SMP-based FW loader allows to issue slot erase command for the slot 1, effectively erasing the FW loader code that is being executed.
This change correctly identifies the slot 1 as an active one, marking it as used and blocking erase operation on that slot.
Upstream PR #: 100689
manifest-pr-skip