ESP8266 Community Forum

I installed the ESP8266 Core for Arduino today on one of my ESP-01 modules with black solder mask.

The default setting for Generic ESP8266 Module, 80 MHz, 40 MHz, DIO, 115200, 512K (64K SIFFS), ck, Disabled, None failed with .

I had to change one of the settings to 512K (no SPIFFS).

Can someone explain what this means?

error: espcomm_upload_mem failed

It means it didn't work. No more than that. Have you had it ever work?

There are all kinds of things that can cause this. Not having the module configure in boot loader mode while resetting. The wrong configuration is another cause.
So the programming step fails. But what have you done before that point? What instructions are you following.

As I wrote above, the upload of the sketch would only work if I change the IDE settings to


I am curious what 512K (No SIFFS) mean?

It is apparently something to do with the ESP-01 module itself.

http://esp8266.github.io/Arduino/versio ... ystem.html

It is an area that is used as a file system. On the ESP-12 boards that I have there is 4MB of flash. 1MB is usable for code (see below) and the remainder can be set up as a place to store files like you would to an SD memory card. The file system can hold web pages, images, or log files generated by your code.

From what I understand the 1MB code space is split in two to allow for code to be uploaded OTA (over the air). This allows you to replace code from a running program.

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