feat(esp32s3): add PSRAM support#5554
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Runtime detection and MMU mapping for quad PSRAM on ESP32-S3. Fix SPI busy-wait to check CMD_USR bit instead of reserved bit 0. Suspend DCache before MMU table writes and configure MSPI clock for PSRAM. Verify PSRAM zero-init with write/readback to detect hardware faults. Separate linker script (esp32s3-psram.ld) shrinks DROM to 8M and adds PSRAM region, keeping non-PSRAM targets unaffected.
digitalentity
marked this pull request as draft
July 24, 2026 22:00
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Very naive QSPI PSRAM support for ESP32-S3. Enabled via
numa_psrambuild tag. Not tested yet.Caveats:
numa_psram_opi).Partly fixes #3772