QUERY · ISSUE

[mboot] It will stay in the dfu mode forever and not reset

openby rolandvsopened 2020-02-24updated 2025-11-09

port-stm32needs-info

When using mboot to replace the code with dfu commands all works fine. However, mboot stays in dfu mode and not resetting the device. This is tested using mboot with the H743.

CANDIDATE · PULL REQUEST

ports/stm32: Leave DFU mode after download.

mergedby iabdalkaderopened 2022-10-12updated 2023-01-19

port-stm32

Not all DFU bootloaders exit after download, this modifier is required for some boards to reset, otherwise they sit idle in DFU mode.
Doesn't seem to have any effect on PYBD_SF2.

Assessment

S Sonnet · medium

Both items address the same symptom — a device remaining stuck in DFU mode after firmware download on STM32 — but at different layers. PR #9593 fixes the host-side dfu-util invocation by adding -s :leave to send a DFU leave/detach request after download. Issue #5693 is about mboot (the firmware-side bootloader) not triggering a reset after DFU completes. Whether the PR resolves the issue depends on whether mboot honours the DFU leave command sent by dfu-util; if mboot doesn't handle that command, the host-side fix has no effect on the reported behaviour. The PR doesn't modify mboot code at all (ports/stm32/Makefile only), so it cannot be considered a direct fix for a bug in mboot's reset logic.

Suggested action

Link PR #9593 in issue #5693 as potentially relevant context. Request from the reporter whether adding `-s :leave` (or equivalent) to their dfu-util invocation resolves the problem. If it does, the issue can be closed as resolved by that PR; if not, the underlying mboot reset logic needs separate investigation.

[mboot] It will stay in the dfu mode forever and not reset

ports/stm32: Leave DFU mode after download.

Keyboard