For in-the-field product updates, or for developers, you can use a specialized second stage loader to write the boot EEPROMs. USB devices typically have to work with many operating systems. The usbstress software http: Someone could usefully write a Free Software version. The FX2 doesn’t support quite as many endpoints six plus control , but it does handle multibuffered high speed transfers in hardware.
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When supported directly by the Linux kernel, these devices appear just like any other kind of serial port. A number of them need to download firmware before they are usable.
One suitable loader is available from Cypress. Firmware source is available. It can support all USB endpoints 30 plus control.
Plus, it’s easier to distribute updated firmware if you don’t need to upgrade a kernel driver to do that. This software is still usable on 2.
Device ezudb just processes interrupts, fills buffers, and tells the hardware to do its thing. Devices that also have off-chip memory use the two stage loader mode.
Cypress EZ-USB FX2 (CY7C68XXX)
That means computers need to download firmware to such devices before they’re used. 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.
Someone could usefully write a Free Software version.
For end user scenarios, it hooks up easily to hotplug utilities. USB devices typically have to work with many operating systems. You could run simple tests that transferred control, bulk, or isochronous traffic.
Their Linux support builds on the common kernel and user mode USB infrastructure, which you cyptess read about elsewhere on this site. A company called AnchorChips now owned by Cypress came out with an innovative and useful product a while ago: 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
The Linux system will typically be much more powerful, since it has at least a bit processor and richer software environment. Martin Diehl has provided EZ-USB firmware implementing simple device protocols that are very useful when used with cyprezs software from Linux-USB hosts, to help verify correct operation of the host and isolate bugs. At this writing, all that firmware is statically linked into the appropriate mini-driver.
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. The FX2 doesn’t support quite as many endpoints six plus controlbut it does handle multibuffered high speed transfers in hardware.
There’s a project working on HID firmware: