ESP32: only works on devices with additional RAM?

[zo0om]

Hi. Thanks for your great work on this. I think I've stumbled across a limitation which wasn't obvious to me.

I've got an external display connected to an ESP32-WROOM-32. When I try to initialise I get:

W (194) boot.esp32: PRO CPU has been reset by WDT.
W (194) boot.esp32: WDT reset info: PRO CPU PC=0x4009f08c
W (196) boot.esp32: WDT reset info: APP CPU PC=0x40081d71
E (878) quad_psram: PSRAM ID read error: 0xffffffff, PSRAM chip not found or not supported
E (878) esp_psram: PSRAM enabled but initialization failed. Bailing out.

Does this indicate that (because of DMI?) the driver will only work with modules with an additional RAM chip (e.g. WROVER)? I guess modules with a built-in display would already have this chip so the requirement might not be obvious. I tried making the display much smaller and reducing dma_rows to no avail.