ESP8266 Community Forum

jcgalvezv wrote:1. I have read that boot loader is burned in the Soc ROM memory. It could be understood as if there was no possibility to brick it with a failed flash. Am i right?

2. I have read that there is a possibility to boot from serial instead of from flash.

For almost 7 months I have used the same ESP-01 to do many tests and experiments. I've messed up the flashing several times... but I've never bricked it yet. These guys are really tough.

I don't know about booting from serial. They do have the capability to boot from SD card but I don't know if anyone's bothered to do it.

If you write a custom firmware that listen for upload command and place the uploaded code into RAM and then execute it, Yes, it is possible, but beware that RAM is limited in size. I don't think it is worth the effort ...

Thank you all of you for your replies.

I guess I need to read more about boot loader. I have found some interesting information at Richard Burton's site. He wrote a replacement boot loader and has some interesting information about the original one.