How to enter uf2 bootloader mode after flashing STM32F401 with the tinyuf2 bootloader?

[tlietz]

I have verified that loading firmware through dfu-util works correctly. However, after flashing the tinyuf2 bootloader, I'm unable to get the board into uf2 bootloader mode.

I've tried pressing reset while holding down boot0, but this just puts the board into dfu bootloader mode. I've also tried double tapping reset, and boot0. Is there something I need to do with boot1, or another pin on the STM32F401?

This is what the terminal prints when flashing the tinyuf2 bootloader onto the board:

➜  make BOARD=stm32f401_blackpill flash
dfu-util -R -a 0 --dfuse-address 0x08000000 -D _build/stm32f401_blackpill/tinyuf2-stm32f401_blackpill.bin
dfu-util 0.11

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2021 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

dfu-util: Warning: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release
Opening DFU capable USB device...
Device ID 0483:df11
Device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Interface #0 ...
Determining device status...
DFU state(10) = dfuERROR, status(10) = Device's firmware is corrupt. It cannot return to run-time (non-DFU) operations
Clearing status
Determining device status...
DFU state(2) = dfuIDLE, status(0) = No error condition is present
DFU mode device DFU version 011a
Device returned transfer size 2048
DfuSe interface name: "Internal Flash  "
Downloading element to address = 0x08000000, size = 15596
Erase           [=========================] 100%        15596 bytes
Erase    done.
Download        [=========================] 100%        15596 bytes
Download done.
File downloaded successfully
dfu-util: can't detach
Resetting USB to switch back to Run-Time mode

[hathach]

have you checked readme ?