Kernel device drivers can do the downloads, but then the firmware just locks down kernel memory. A company called AnchorChips now owned by Cypress came out with an innovative and useful product a while ago: Firmware source is available. For in-the-field product updates, or for developers, you can use a specialized second stage loader to write the boot EEPROMs. Martin Diehl has provided EZ-USB firmware implementing simple device protocols that are very useful when used with usbtest software from Linux-USB hosts, to help verify correct operation of the host and isolate bugs. For end user scenarios, it hooks up easily to hotplug utilities. There’s a project working on HID firmware:

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This cyprrss page is designed as a community resource, with cross links to related projects as well as hosting some Linux-focused efforts directly. Martin Diehl has provided EZ-USB firmware implementing simple device protocols that are very useful when used with usbtest software from Linux-USB hosts, to help verify correct operation of the host and isolate bugs.

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Cypress EZ-USB FX2 (CY7C68XXX)

The usbstress software http: For in-the-field product updates, or for developers, you can use a specialized second stage loader to write the boot EEPROMs. Plugging EZ-USB devices into a Linux system runs device-specific scripts, which can download the appropriate firmware hexfile. Plus, it’s easier to distribute updated cyypress if you don’t need to upgrade a kernel driver to do that. A company called AnchorChips now owned by Cypress came out with an innovative and useful product a while ago: Kernel device drivers can do the downloads, but then the firmware just locks down kernel memory.

The Linux system cyprss typically be much more powerful, since it has at least a bit processor and richer software environment.

USB devices typically have to work with many operating systems. This software is still usable on 2. The FX2 doesn’t support quite as many endpoints six plus controlbut it does handle multibuffered high speed transfers ezusg hardware. When supported directly by the Linux kernel, these devices appear just like any other kind of serial port.

Someone could usefully write a Free Software version. There’s a project working on HID firmware: Firmware source is available.

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Their Linux support builds on the common kernel and user mode USB infrastructure, which you can read about elsewhere on this site.

You esusb run simple tests that transferred control, bulk, or isochronous traffic. Device firmware just processes interrupts, fills buffers, and tells the hardware to do its thing. For end user scenarios, it hooks up easily to hotplug utilities. That means computers need to download firmware to such devices before they’re used. Devices that also have off-chip memory use the two stage loader mode.

Cypress EZ-USB FX2 (CY7C68XXX)

It can support all USB endpoints 30 plus control. A number of them need to download firmware before they are usable.

At this writing, all that firmware is statically linked into the appropriate mini-driver. One suitable loader is available from Cypress.