When supported directly by the Linux kernel, these devices appear just like any other kind of serial port. A company called AnchorChips now owned by Cypress came out with an innovative and useful product a while ago: Plus, it’s easier to distribute updated firmware if you don’t need to upgrade a kernel driver to do that. It can support all USB endpoints 30 plus control. Device firmware just processes interrupts, fills buffers, and tells the hardware to do its thing. USB devices typically have to work with many operating systems.

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Kernel device drivers can do the downloads, but then the firmware just locks down kernel memory. Someone could usefully write a Free Software version.

At this writing, all that firmware is statically linked into the appropriate mini-driver. USB devices typically have to work with many operating systems. When supported directly by the Linux kernel, these devices appear just like any other kind of serial port.

Plugging EZ-USB devices into a Linux system runs device-specific scripts, which can download the appropriate firmware hexfile. That means computers need cypress download firmware to such devices before they’re used.

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EZ USB on Linux

Plus, it’s easier to distribute updated firmware if you don’t need to upgrade a kernel driver to do that. It can support all USB endpoints 30 plus control.

Device firmware just processes interrupts, fills buffers, and tells the hardware to usg its thing. Firmware source is available.

This web page is designed as a community resource, with cross links to related projects as well as hosting some Linux-focused efforts directly. Devices that also have off-chip memory use the two stage loader mode. This software is still usable on 2.

Cypress EZ-USB FX2 (CY7C68XXX)

One suitable loader is available from Cypress. You could run simple tests that transferred control, bulk, or isochronous traffic. For end user scenarios, it ysb up easily to hotplug utilities. The Linux system will typically be much more powerful, since it has at least a bit processor and richer software environment.

Cypress EZ-USB FX2 (CY7C68XXX)

A company called AnchorChips now owned by Cypress came out with an innovative and useful product a while ago: The usbstress software http: 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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There’s a project working on HID firmware: The FX2 doesn’t support quite as many endpoints six plus controlbut it does handle multibuffered high speed transfers in hardware. A number of them need to download firmware before they are usable. For in-the-field product updates, or for developers, cypeess can use a cypreess second stage loader to write the boot EEPROMs.

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