I'm bumping my head but can't find the way to trigger the "debug action" on my Powershot G15.
The menu help says Erase Alt +/-. I tried to configure the Alt button to each and every different possibility but had no luck in finding the magical Erase Alt combination. Needless to say the camera does not have a +/- button.
Anybody can help?
The keymap of the port is a bit incomplete. See platform/g15/kbd.c .
You could try to work out the missing buttons, especially KEY_ERASE. I think the KEY_DISPLAY alias should be removed from the map, as that button is the "DOWN" button.
To let CHDK know that the cam doesn't have a dedicated DISP button add
to the port's platform_camera.h
To visualize physw_status, uncomment the "debug keymap, KEYS_MASKx, SD_READONLY_FLAG, USB_MASK" block in core/gui_osd.c (search for the string).