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