Hi

Check out this thread ( you have to scroll down quite a bit )

http://old.nabble.com/tx-watch-dog-timeout-td29548226.html#a29558551

It describes the kernel changes necessary to change the power Linux thinks
there is available from the OTG USB port. Note that it is for kernel version 2.6.33.

regards Morten Larsen

2011/1/28 William Pretty Security Inc <bill.pretty@xplornet.com>
Sigh ...
Bummer :(

I had a bad feeling it was too easy ...
If it was that simple, then everyone would be doing it !!
Maybe we should start a thread to look into this kernel switch??

Bill

-----Original Message-----
From: Tom Calef [mailto:TCalef@HatchScience.com]
Sent: Friday, January 28, 2011 12:03 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Change to kernal? (Was) External Power for USB

If you try to power up a USB device off of the OTG port (I am assuming this
is the port your using.. I may be wrong), if the power descriptor says that
its max power > 100mA then the kernel will yell at you saying that its above
the recommended amount. I've been trying to figure out where to shut this
check off, but with no avail.

-Tom


-----Original Message-----
From: William Pretty Security Inc [mailto:bill.pretty@xplornet.com]
Sent: Thu 1/27/2011 6:36 PM
To: 'General mailing list for gumstix users.'
Subject: [Gumstix-users] Change to kernal?  (Was) External Power for USB

Hi Tom;



I'm sorry. I don't know what you mean ?



When you plug in the dongle , the adapter powers it up.

What's to change in the Kernel ?

What checks ?



The dongle would have to be plugged in when you powered up the Overo. It
wouldn't be hot swapable ..



Bill



The best executive is one who has sense enough to pick good people to do
what he wants done,

and self-restraint enough to keep from meddling with them while they do it.

Theodore Roosevelt



From: Tom Calef [mailto:TCalef@HatchScience.com]
Sent: Thursday, January 27, 2011 3:12 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] External Power for USB



That should work fine, but do you know what to set in the kernel to make it
get past the checks?



From: Thomas Epperson [mailto:thomas.epperson@gmail.com]
Sent: Thursday, January 27, 2011 2:13 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] External Power for USB



That should work.

On Thu, Jan 27, 2011 at 12:28 PM, William Pretty Security Inc
<bill.pretty@xplornet.com> wrote:

First of all I'm more of a hardware person, so my solutions tend to be
hardware based J



That being said, here is my proposed solution:



In the attached schematic, you use the +5V from the USB input connector as a
logic signal to turn on the FET.

Because FET's are voltage controlled devices, it takes very little current
to turn them on J



If you use a high current FET and a high current supply you could supply
AMPS to the USB device JJJ



What do you guys think ??





"People sleep peaceably in their beds at night only because rough men

stand ready to do violence on their behalf." - George Orwell




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Thomas Epperson
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he'll be warm for the rest of his life. - Terry Pratchett.

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Download using promo code Free_Logger_4_Dev2Dev. Offer expires
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