ESP32S3 WROOM-2 Flash 32MB, 8MN PSRAM - issue with MSPI Timing: tuning fail

[dgroch]

Hi,

on my new ESP32S3 WROOM-2 32MB Flash 8MB PSRAM chips I have started seeing given error:

MSPI Timing: tuning fail, best point is fallen back to index 1

All chips are the same, however I can see given error for only on some of them. Reducing Flash frequency to:
CONFIG_ESPTOOLPY_FLASHFREQ_40M=y

is fixing issue.
I have already seen some similar topic here:
viewtopic.php?f=25&t=33328
with no answer.
What could be reason of this error only on some of the new bought chips?

BR
Dawid

[electronicsguy]

https://github.com/espressif/esp-idf/issues/13019

I see the same thing if I try to use GPI pins 34-38. It happens sometimes, not always. Don't know what the issue is.

[MicroController]

I see the same thing if I try to use GPI pins 34-38. It happens sometimes, not always. Don't know what the issue is.

The issue is that, according to the datasheet, those pins are used to communicate with the PSRAM in Octal SPI mode. Don't mess with them if you have PSRAM enabled (in OPI mode).