Serial over USB generally refers to those RS232 to USB dongles (for
adding a com port to a laptop without legacy ports, etc. - like this
thing: http://www.buy.com/retail/product.asp?sku=10262122&loc=101&sp=1)
or for generic USB to UART-like-interface chips used to update a legacy
RS232-capable board to a USB device.  Serial-over-usb (see the serial.c
gadget code and the host drivers in drivers/usb/serial) is often used in
actual products (dongles, PDAs, etc).  It's not a test tool at all.

Basically if you load g_serial.ko on top of your gadget driver (ie
net2280.ko) and plug into a host, you'll pop up as a serial device such
as /dev/ttySXXXX.

Quite different from testusb which is only really used to test USB
hardware and low-level firmware/drivers and is then replaced with "real"
code for a real product.

regards,
alex

박호상 wrote:
> Hello.
> I have heard the serial over USB.
> Maybe, I guess that is test tool just like ‘testusb’.
> However, I don’t know the difference between serial over USB and
> ‘testusb’, and what is serial over USB exactly.
> 
> What is the serial over USB?
> And how can I get the information about serial over USB?
> Any information (reference or web page....and so on) is OK.
> 
> 
> 
> 
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