Kernel device drivers can do the downloads, but then the firmware just locks down kernel memory. 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: That means computers need to download firmware to such devices before they’re used. A number of them need to download firmware before they are usable.
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For end user scenarios, it hooks up easily to hotplug utilities. Device firmware just processes interrupts, fills buffers, and tells the hardware to do its thing.
EZ USB on Linux
Plugging EZ-USB devices into a Linux system runs device-specific scripts, which can download the appropriate firmware hexfile. For in-the-field product updates, or cypres developers, you can use a specialized second stage loader to write the boot EEPROMs.
When supported directly by the Linux kernel, these devices appear just like any other kind of serial port. Firmware source is available.
The FX2 doesn’t support quite as many endpoints six plus controlbut it does handle multibuffered high speed transfers in hardware. That means computers need to download firmware to such devices before they’re used.
Cypress EZ-USB FX2 (CY7C68XXX)
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.
It can support all USB endpoints 30 plus control. USB devices typically have to work with many operating systems.
This software is still usable on 2. One suitable loader is available from Cypress. There’s a project working on HID firmware: 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 usbstress software http: This web page is 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, cpress you can read about elsewhere on this site.
The Linux system will typically be much more powerful, since it has at least a bit processor and richer software environment.
Devices that also have off-chip memory use the two stage loader mode. A ezubs 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.
You could run simple tests that transferred control, bulk, or isochronous traffic. 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.