Repeat the flag -vv , -vvv to get more diagnostics. 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. Firmware source is available. When supported directly by the Linux kernel, these devices appear just like any other kind of serial port. That means that device drivers relying on user mode firmware downloading may need to depend on that kernel configuration option. The usbstress software http:

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It can support all USB endpoints 30 plus control. It also assumes that the device in question has been specified by USB kernel hotplugging conventions, using the DEVICE environment variable to name a “usbfs” file that can be used to talk to the device.

At this writing, “usbfs” oinux a kernel configuration option. The usbstress software http: By default, those nodes are only accessible by privileged users, which doesn’t help when the user mode device driver needs to run without root privileges.

For end user scenarios, it hooks up easily to hotplug utilities. A less preferable alternative involves compiling the firmware into the kernel and managing downloads and renumeration there. Depending on the device and firmware in use, the -s option may also be necessary to specify a second stage loader.

Device firmware just processes interrupts, fills buffers, and tells the hardware to do its thing.

Linux Support for FX2LP™ and other USB Peripher | Cypress Developer Community

Both of these can help simplify software applications that need to talk to USB devices using user mode drivers, don’t want to run with privileges or to examine all of the existing USB devices, and which don’t need more kernel drivers. Normally, firmware will then “renumerate” by disconnecting from USB and then reconnecting as a new device. Their Linux support builds on the common xf2 and user mode USB infrastructure, which you can read about elsewhere on this site.


It then appears with new device descriptors and functionality, as provided by the firmware which has been downloaded. Ub that put firmware into external memory thus need a second stage loader. One suitable loader is available from Cypress.

This requires a second stage loader e.

fxload (8) – Linux Man Pages

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. For typical “flat” memory architectures, a loader supporting the 0xA3 vendor request is used to write into that memory.

Note that this only supports the 0xA3 vendor command, to write external memory. Plugging EZ-USB devices into a Linux system runs device-specific scripts, which can download the appropriate firmware hexfile. To support some non-firmware applications, this can also set up symbolic links for those usbfs names.

The symlink would be removed by some other component on device unplug. The FX2 doesn’t support quite as many endpoints six plus controlbut it does handle multibuffered high speed transfers in hardware. A company called AnchorChips now owned by Cypress came out with an innovative and useful product a while ago: Note that when downloading firmware that renumerates, there’s no point in changing the device permissions or creating a symbolic link.


Other tools may not handle hexfiles using this extension. This web page is designed as a community resource, with cross links to related projects as well as hosting some Linux-focused efforts directly. For EZ-USB family devices, the hardware’s first stage loader supporting the 0xA0 vendor request can’t write into external memory.

For in-the-field product updates, or for developers, you can use a specialized second stage loader to write the boot EEPROMs.

Ez Usb –

Repeat the flag -vv-vvv to get more diagnostics. Firmware source is available. You could run simple tests that transferred control, bulk, or isochronous traffic. It can also change their access modes. This is less preferable in part because much device firmware is provided with GPL-incompatible licensing, and in part because storing such firmware firmware wastes kernel memory.

As a last step when loading firmware, fxload normally overwrites this second stage loader with parts of the firmware residing on-chip.