Re: net2280: is use_dma_chaining obsolete?

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On Tue, 25 Nov 2014, Ricardo Ribalda Delgado wrote:

> Hello Alan
> 
> Could you test if the parameter dma_chaining works on your board with
> the current kernel?
> 
> #on the target
> modprobe net2280 use_dma_chaining=1 #(it it is already loaded, rmmod)
> dd if=/dev/zero of=/tmp/mem bs=256M count=1
> modprobe g_mass_storage file=/tmp/mem
> 
> #on the host
> #Check if /dev/sdX has apperared
> dd if=/dev/sdX of=/dev/null

It doesn't even come close to working.  The system grinds to a halt 
when the UDC fails to send the third bulk-out packet.  The first two 
packets get sent okay.

Alan Stern

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