I am working on securing a legacy device (making it as secure as I can, that is...), specifically an ESP32-D0WD. I have enabled secure boot, flash encryption, and set the eFuses as recommended in the ESP-IDF documentation. However, I am still a little concerned about the SDIO slave interface, which I haven't seen being mentioned much in the ESP-IDF documentation. According to https://documentation.espressif.com/esp ... et_en.pdf section 4.8.11:
Are there any extra security precautions / practises I need to apply to protect this interface apart from what I have already taken? Thanks!ESP32 integrates an SD device interface that [...] allows a host controller to access the SoC, using the SDIO bus interface and protocol. ESP32 acts as the slave on the SDIO bus. The host can access the SDIO-interface registers directly and can access shared memory via a DMA engine, thus maximizing performance without engaging the processor cores.