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The ESP32-S2 Crypto DMA in-channel stalls silently when a receive descriptor list transitions from external to internal RAM. The AES driver hits this when a PSRAM-output operation has a trailing partial block, as the internal stream descriptor is linked after the external RAM data descriptors. - esp_aes_process_dma(): process the block-aligned part and the partial block as two separate DMA operations, keeping each descriptor list uniform - crypto_dma_ll_reset(): also reset the in-channel (per the TRM receive reset sequence), otherwise stale state from a preceding external-RAM operation corrupts the next operation's output The GCM DMA path is unaffected; it never operates on PSRAM buffers.