ESP32 WROOM Serial Bootloader?

[mreutman]

Hello,

I've been doing some development on the ESP32 WROVER board and have found it to be a joy to make use of. In the future, I'm planning on creating a custom PCB that makes use of the ESP32 WROOM module and was wondering, does the WROOM come preloaded with the same serial bootloader that the WROVER kit comes preprogrammed with? I've seen a few hints in different parts of the web that makes me believe it comes preprogrammed, but nothing really official (maybe I'm just looking in the wrong places).

If the serial bootloader is preloaded, I'm assuming I should take precautions with regards to IO0 in my design as documented here?

If there is no serial bootloader, I'm assuming JTAG needs to be used to program the WROOM module for the first time?

Any assistance is much appreciated. Thanks!

[WiFive]

Yes it is part of factory ROM. Yes you need to watch gpio 0, 2, 12.

[mreutman]

Thanks for the confirmation! Will keep that in mind.