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.

[EricNRS]

I am actively using octal SPIRAM on an ESP32-S3 N8R16 module using the xiao_esp32s3/esp32s3/procpu target and it works fine, so I think this issue can be closed now that HAL 5.x has been integrated.

[FacepalmMute]

It works!
But there seems to be a problem when using with mcuboot on my ESP32S3 N32R8V:

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
Octal Flash Mode Enabled
For OPI Flash, Use Default Flash Boot Mode
mode:SLOW_RD, clock div:2
load:0x3fcb5400,len:0x2bc8
load:0x403ba400,len:0xa91c
load:0x403c6400,len:0x15f4
entry 0x403bd89c
I (93) boot: MCUboot 2nd stage bootloader
I (93) boot: compile time Jan 10 2025 12:40:29
W (93) boot: Unicore bootloader
W (93) spi_flash: Octal flash chip is using but dio mode is selected, will automatically swich to Octal mode
I (102) spi_flash: detected chip: mxic (opi)
I (106) spi_flash: flash io: opi_str
W (109) spi_flash: Detected size(32768k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (122) boot: chip revision: v0.1
I (125) boot.esp32s3: Boot SPI Speed : 40MHz
I (129) boot.esp32s3: SPI Mode       : FAST READ
I (133) boot.esp32s3: SPI Flash Size : 32MB
I (137) boot: Enabling RNG early entropy source...
W (175) spi_flash: Octal flash chip is using but dio mode is selected, will automatically swich to Octal mode
E (176) spi_flash: failed to get chip size

Same sample works without sysbuild.
Can anyone confirm this?

Edit:
In main branch this issue seems to be fixed. This error is reproducible on v4.0.0.

[EricNRS]

That may be an octal flash issue and not PSRAM. A similar issue was opened yesterday here: #83743