esp32-c6 rom function to download mode.

[watchdog40]

Hello.
Which ROM function needs to be called to put the ESP32-C6 into download mode?
The documentation states that this step can be performed by setting GPIO 9 to a high state, so I assume this calls a ROM function.
I found the ROM function at 0x40000090 (# software_reset), but it triggers a processor reboot.
Thanks.

[Sprite]

No ROM function exists, but you can get into download mode from firmware by setting the LP_AON_FORCE_DOWNLOAD_BOOT reglster, then restarting the ESP.

[watchdog40]

Thanks.
So, I’ve adjusted my program. The ESP32 successfully enters download mode, as shown in the first log.
However, flashing still results in an error—see the second log:

log 1 :
modeLoadPgm
ESP-ROM:esp32c6-20220919
Build:Sep 19 2022
rst:0x3 (LP_SW_HPSYS),boot:0x5 (DOWNLOAD(USB/UART0/SDIO_FEI_REO))
Saved PC:0x4001974a
waiting for download

end log compiler :

C:\Espressif\tools\python\v6.0.1\venv\Scripts\esptool --chip esp32c6 -p com14 -b 460800 write-flash --flash-mode dio --flash-freq 80m --flash-size 2MB 0x0 projet1.bin
esptool v5.3.0
Serial port com14:

A fatal error occurred: Could not open com14, the port is busy or doesn't exist.
(could not open port 'com14': PermissionError(13, 'Accès refusé.', None, 5))

[watchdog40]

Oh, sorry—you have to close the PuTTY session, and then it works!
Thanks a lot.