One suitable loader is available from Cypress. This software is still usable on 2. At this writing, all that firmware is statically linked into the appropriate mini-driver. USB devices typically have to work with many operating systems. Kernel device drivers can do the downloads, but then the firmware just locks down kernel memory. For in-the-field product updates, or for developers, you can use a specialized second stage loader to write the boot EEPROMs.
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Cypress EZ-USB FX2 (CY7C68XXX)
Devices that also have off-chip memory use the two stage loader mode. That means computers need to download firmware to such devices before they’re used.
The usbstress software http: For in-the-field product updates, or for developers, you can use a specialized second cypresss loader to write the boot EEPROMs.
One suitable loader is available from Cypress. You could run simple tests that transferred control, bulk, or isochronous traffic.
EZ USB on Linux
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. Plus, it’s easier to vypress updated firmware if you don’t need to upgrade a kernel driver to do that. The FX2 doesn’t support quite as many endpoints six plus controlbut it does handle multibuffered high speed transfers in hardware.
Plugging EZ-USB devices into a Linux system runs device-specific scripts, ezuwb can download the appropriate firmware hexfile. 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.
The Linux system will typically be much more powerful, since it has at least a bit processor and richer software environment. A company called AnchorChips now owned by Cypress came out with an innovative and useful product a while ago: Device firmware esusb processes interrupts, fills buffers, and tells the hardware to do its thing. For end user scenarios, it hooks up easily to hotplug utilities.
Cypress EZ-USB FX2 (CY7C68XXX)
A number of them need to download firmware before they are usable. It can support all USB endpoints 30 plus control.
Firmware source is available. When supported directly by the Linux kernel, these devices appear just like any other kind of serial port.
USB devices typically have to work with many operating systems. There’s a project working on HID firmware: This software is still usable on 2. This web page cypresa designed as a community resource, with cross links to related projects as well as hosting some Linux-focused efforts directly.
Their Linux support builds on the common kernel and user mode USB infrastructure, which you can read about elsewhere on this site.