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List:       uclinux-dev
Subject:    Re: [uClinux-dev] USB relay
From:       Bou <mpourtou () ceid ! upatras ! gr>
Date:       2008-06-26 10:28:36
Message-ID: 48636F54.1080301 () ceid ! upatras ! gr
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Remco Poelstra wrote:
> Michael Schnell schreef:
>>
>>>>> assume that you have 2 platforms with usb support. In fact, one 
>>>>> device and a PC.
>>>>> On the first platform, you have a USB device attached (e.g. a 
>>>>> memory stick).
>>>>> You connect the platform with the PC through their usb ports.
>>>>> Is there any way you can control the memory stick through the PC? 
>>>>> (The first platform will act something like a USB relay?).
>>> Its not mandatory that the platform can access the USB device at the 
>>> same time. I can even have 2 different firmwares, one for normal 
>>> use(ttyUSBx) and another as a Linux Hub. How can I make mt platform 
>>> behave like a usb hub? (I have no experience in USB, any hints are 
>>> welcomed).
>> To me this seems like a very dangerous thing. The PC software will 
>> assume that the data on the memory stick is unchanged unless it is 
>> plugged out and re-discovered. So if your device works as a hub and 
>> under the covers accesses the memory stick, the PC will easily fail 
>> or corrupt the data on the stick.
>
> Seems that Dimitris only wants one of the two options: Either a very 
> expensive memory stick or a device running linux with some added flash 
> memory. In that case the problem you mentioned doesn't exist, 
> otherwise I also doubt that it's going to work.
> Of course the "expensive memory stick" option can also be implemented 
> with Linux running on the uC, but it indeed shouldn't access the 
> memory stick on it's own then.
In case of "external" operation, the platform itself(uC) is not supposed 
to access-use the usb device. (In fact, the usb device is a 3G card)
> How is the device connected to the PC? What is between the USB 
> connector and the microcontroller? If it's such a nice FTDI serial 
> converter, than it's not going to work anyway (without a lot of work).
I was thinking of having the PC connected directly to the 
platform(second usb interface). (The first usb interface is for the usb 
device itself).

I found a "usb-server" on the net 
(http://usb-server.com/usb-redirector-usb-server.html), where you can 
access the usb device from network (run the usb-server on the platform 
and usb-client on the PC). The bad thing is that some deamons are 
pre-built (no-source). My platform is currently x86. Is there any way I 
can "recompile" the (dynamically linked)binaries (glibc pre-built) as 
static (in order to use them in my fs)?

Thanks,
Dimitris


>
> Kind regards,
>
> Remco Poelstra
>
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