Re: Preempt-RT on OMAP3?

[David Brownell <david-b@pacbell.net>]

On Monday 06 April 2009, Hugo Vincent wrote:
> 
> Here are some of the crashes I've seen. Warning - I'm new to -rt and
> to the linux-omap tree, so I'll apologize in advance if these are just
> a result of me missing something obvious.

Thanks, I'll take a look.


> Context: using USB-gadget ethernet (g_ether) over musb (configured as
> just peripheral, not OTG). Most of the time it works, but after a
> while, or when it encounters a large packet (e.g fping -b30000) it
> crashes like so (apparently something to do with receive DMA usage).
> Although the fping -b case is kindof pathological, I've seen the same
> crash when ssh/scping files across to the board, so it does occur in
> real usage.

RX DMA is troublesome with the MUSB code, and there are some bugfixes
pending which should affect it.  (Posted to linux-usb over the last
week or two.)

Do these problems show up with DMA disabled?

- Dave