I have a headless RPI booting from a USB pen.
I want to setup other headless RPIs that are meant to be booted from the NOOBS SD card.
So, I'd like to access the SD card from the USB-booted RPI in order to setup the wpa_supplicant.conf with the wifi credentials so that I can then ssh into them.
(If there is an easier alternative for first time setups without access to peripherals or ethernet connections, please let me know)
How should I find/mount the SD card from the terminal of the USB booted RPI?
By checking the diff on /dev with and without the SD card plugged in, it seems it's /dev/mmcblk0 . I've tried to mount it to a new folder, but I get "its already mounted/busy", and with ps aux | grep mmcblk0 I do find a process with the name.
I dont wanna mess up anything, so I havent unmounted it, im not sure whats going on.
Thank you for the help!