![]() They are either shipped with no firmware at all, or at least with outdated firmware. Apparently, at least some of the cards equipped with an EEPROM do initially not function properly with Linux, and maybe even with Windows. But apparently, this patch never made it into the kernel and I have not found the firmware image in the linux-firmware repository. For the first case, there exists a patch for the Linux kernel driver for this chipset to support uploading the firmware image at boot time. Its open to the vendor to choose one of these options. It must be either uploaded by the driver during initialization, or can be stored on an external EEPROM. The uPD720202 chipset requires additional firmware to operate. This post is about the difficulties I experienced when trying to use such an extension card with Linux, and a tool to upload required firmware to the chipset. ![]() This may also apply to other Renesas USB chipsets as well. ![]() USB 3.0 extension cards based on Renesas uPD720202 chipset appear to be somewhat problematic when Linux is used as operating system.
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