ESP32S3: Octal SPI RAM support

[tyalie]

Currently it is not possible to use the ESP32S3 variants with 8MB PSRAM. See issue #64510.
For me it breaks the use of PSRAM on the XIAO ESP32S3 boards I want to use.

The solution would be to be able to use PSRAM with octal spi.

[lgl88911]

Any plans to support PSRAM for ESP32-S3? It's an important feature for this platform.

[rftafas]

@lgl88911 Octal PSRAM should be available when Zephyr starts supporting hal 5.1 - we are taking care of some regressions to make it usable as 'pre-alfa' in order to share a WIP / Draft PR.

[laurin]

Hey, is this still the latest status?

[rftafas]

@laurin yes, it is. We are wrapping up the last issues on hal5. You can try the current wip: #65942

[jadejr]

This is the PR #68760 for hal 5.1 that ended up being merged.

So, is this issue still valid? How would you enable it if you were using 3.7?

[rftafas]

PTAL CONFIG_SPIRAM_MODE_OCT

https://docs.zephyrproject.org/latest/kconfig.html#CONFIG_SPIRAM_MODE_OCT

You also need to enable PSRAM normally and do all other proper configurations.

Even though the implementation has bugs, I think this can be closed.