![]() Posted in Mac Hacks, News Tagged big sur, ftdi, macOS Post navigation So far only the FTDI team has been somewhat responsive based on the support forum thread, with Apple seemingly rather silent on the issue. As these FTDI chips are often used for virtual com port (VCP) purposes, such as with Arduino boards and USB-TTL adapters, this is a rather cumbersome issue that would affect anyone using Big Sur in combination with such a hardware device. Over the past years, Apple has been restricting and changing the way kernel extensions (KExt) and driver extensions (DExt) are handled. Many products however set a custom product ID (PID) to differentiate their device, though in the thread some mention that there are driver issues even with the default VID/PID combination. ![]() At its core appears to be that the built-in FTDI driver provided by Apple (xt) only supports FTDI chips which provide the standard FTDI vendor and product ID (e.g. An anonymous reader pinged us about an issue that affects people who jumped onto the latest-and-greatest OS from the Apple gardens: USB devices that stop working due to the FTDI-based USB solution.
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