ESP32 Forum

Recently I started to work with the ESP32-Solo-1, the question came up if it is possible to add a second external flash memory for example to the VSPI to get additional memory.

In the technical reference it says that the ESP32-S0WD chip can map up to 16 MB external flash, so would that mean that the 4MB on the ESP32-DevKitC-S1 have to be subtracted from the 16MB? Or is it possible to add e.g. 16MB in addition to the 4MB on the ESP32-DevKitC-S1?

The ESP32-Solo-1 datasheet states that up to 16MB can be mapped, but that there is a delay from 11MB external flash on due to speculative cache reading. Does that mean that more external flash can be added and the access to it is just delayed?

I apologize if the questions are already answered somewhere, I'm still new to the topic.

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The 16MiB only goes for the primary flash (the one already in the module). It's not possible to memory map a secondary flash chip. If you need more flash and are running production (as in: you need lots of modules) an option is to contact Espressif and ask them if you can get modules with 16MiB of flash instead.

I've heard that it is possible to diable the internal flash and use only an external is that right for the Solo-1?

You can redefine the flash pins by burning certain Efuses, yes.