Multiple PSRAM into memory mapping

[daviherc]

Hello all,

I would like to know if it is possible to use multiple sources of PSRAM to build more malloc-capable memory.

This could be, for example:
- An ESP32-S3R8 and an external ESP32-PSRAM64H tied to the SPI0/1 bus
- Two ESP32-PSRAM64H in parallel, tied to the SPI0/1 bus

[WiFive]

I don't think so, you would have to be able to associate each memory mapped region to a different chip select. There are 128mb psram chips though.

[daviherc]

But in the ESP32R8(V) example, there is only one external device. Or is a CS required for the SiP RAM too?

[ESP_Sprite]

'External' in this sense means external to the ESP32S3 silicon die. The ESP32R8 QFN package has an ESP32S3 die in it with on top of that a separate PSRAM die, so it's still viewed as 'external' even if the PSRAM is in the same package as the ESP32S3.