svn commit: r192018 - head/sys/arm/at91

John Baldwin jhb at
Tue May 12 18:26:50 UTC 2009

On Tuesday 12 May 2009 12:07:08 pm Stanislav Sedov wrote:
> Author: stas
> Date: Tue May 12 16:07:08 2009
> New Revision: 192018
> URL:
> Log:
>   - Implement detach path.
>   - Release memory and DMA resources on stop.
>   - Unload the associated DMA maps after transmit is complete.

Most NIC drivers that I am familiar with do not destroy DMA resources (tags 
and maps) during stop() and then create them during if_init().  Instead, they 
create those during attach() and detach().  They do tend to populate the RX 
ring with buffers during if_init() and free all of the mbus during stop() 

John Baldwin

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