Accessing PSRAM (XSPI1) While Running Application from Flash (XSPI2)

[andgarriv]

Hello everyone,

I’m working on an STM32H7S3L8H6H with two XSPI interfaces:

• XSPI1 (Quad-SPI) connects to an external PSRAM. 
• XSPI2 (Octo-SPI) drives an external NOR flash, from which my application code executes directly.

In my bootloader I configure both and start the external memory manager:

MX_XSPI1_Init();
MX_XSPI2_Init();
MX_EXTMEM_MANAGER_Init();

This maps the flash at 0x7000_0000 and the PSRAM at 0x9000_0000. After jumping to main() in the application (which is executing from the XSPI2 flash), I’ve marked XSPI1 as “Runtime Context” in CubeMX and still call:

MX_XSPI1_Init();

But it hangs here:

// inside MX_XSPI1_Init():
if (HAL_XSPIM_Config(&hxspi1, &sXspiManagerCfg, HAL_XSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK) {
    Error_Handler();  // stops here
}

I have validated each interface separately, XSPI2 boots and runs code, and XSPI1 handles PSRAM reads/writes without issue. So now, how can I access and use the PSRAM from within the application (which is itself executing from the external flash) ?

Any pointers, configuration tips or code snippets would be greatly appreciated. Thank you!

[KDJEM.1]

Hello @andgarriv;

Could you please check the XSPI1 configuration? 

Is the memory interface running with the maximum speed 200 MHz and with VDD<2.7V?

If yes, make sure that HSLV is enabled.

I recommend you to look at Recommendations for high-speed low-voltage mode (HSLV) on the STM32H7RS.

Thank you.

Kaouthar

[andgarriv]

Hello Kaouthar,

XSPI1 is working correctly in the boot code, and in both codebases it’s initialized with the same configuration. It’s running at 50 MHz (200 Mhz without prescaler), VDD = 1.8 V, and HSLV mode is enabled.

Let me know if you need anything else!

[NesrynELMK]

Hello @andgarriv ,

Could you please share your MX_XSPI1_Init() and  MX_XSPI2_Init() configurations ?

Please, ensure that each XSPI is mapped independently to its corresponding port (e.g., XSPI1 to Port 1 and XSPI2 to Port 2)

Kind regards,