To support some non-firmware applications, this can also set up symbolic links for those usbfs names. For EZ-USB family devices, the hardware’s first stage loader supporting the 0xA0 vendor request can’t write into external memory. This firmware is provided in standard Intel hexfile format. These 0xA2 and 0xA3 vendor commands are conventions defined by Cypress. Plugging EZ-USB devices into a Linux system runs device-specific scripts, which can download the appropriate firmware hexfile. It can support all USB endpoints 30 plus control.
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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.
Someone could usefully write a Free Software version. Note that this only supports the 0xA3 vendor command, to write external memory. For typical “flat” memory architectures, a loader supporting the 0xA3 vendor request is used to write into that memory.
fxload (8) – Linux Man Pages
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.
At this writing, all that firmware is statically linked into the appropriate mini-driver. It can also change their access modes. To support some non-firmware applications, this can also set up symbolic links for those usbfs names.
Ez Usb –
This uses “usbfs” older name: The FX2 doesn’t support quite as many endpoints six plus controlbut it does handle multibuffered high speed transfers in hardware. You could run simple tests that usv control, bulk, or isochronous traffic.
Note that when downloading firmware that renumerates, there’s no point in changing the device permissions or creating a symbolic link.
That means that device drivers relying on user mode firmware downloading may need to depend on that kernel configuration option. That means computers need to download firmware to such devices before they’re used. At this writing, “usbfs” is a kernel configuration option.
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. Configurations that put firmware into external memory thus need a second stage loader. Kernel device drivers can do the downloads, but then the dx2 just locks down cx2 memory. Firmware source is available. One suitable loader is available from Cypress.
Devices that also have off-chip memory use the two stage loader mode.
This software is still usable on 2. USB devices typically have to work with many operating systems. The Linux system will typically be much more powerful, since it has at least a bit processor and richer software environment. Devices that use bank switching or similar mechanisms to stretch the 64KByte address space may need different approach to loading firmware.
There’s a project working on HID firmware: Their Linux support builds on the common kernel and user mode USB infrastructure, which you can read about elsewhere on this site. A number of them need to download firmware before they are usable.
For EZ-USB family devices, the hardware’s first stage loader supporting the 0xA0 vendor request can’t write into external memory.
Ubuntu Manpage: fxload – Firmware download to EZ-USB devices
The symlink would be removed by some other component on device unplug. 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 in-the-field product updates, or for developers, you can use a specialized second stage loader to write the boot EEPROMs.
By default, those nodes are only accessible by privileged users, which linxu help when the user mode device driver needs to run without root privileges. This is provided by the Linux kernel as part of USB hotplugging. It can support all Kinux endpoints 30 plus control.