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Re: MMU Bus fault



Hi

Strange enough, but I seem to have isolated the indifferent bahaviour to a
difference between ktest and flashit. If I write the new image to the device
using ktest the system is functional. If I write the image to the device
using flashit, the system PANICs as soon as I wrie to /dev/ttyUSB0

Could anyone explain or propose a fix?

I've changed CONFIG_ETRAX_DEF_R_BUS_CONFIG from 4 to 04, as I've made the
change before, but this does not change behaviour.

Thanks
Cedric
----- Original Message -----
From: "Mikael Starvik" <mikael.starvik@xxxxxxx.com>
To: <cedric.stevens@xxxxxxx.com>;
"dev-etrax" <dev-etrax@xxxxxxx.com>
Cc: "Henrik Eriksson" <henrik.eriksson@xxxxxxx.com>
Sent: Wednesday, May 19, 2004 7:39 AM
Subject: RE: MMU Bus fault


> Just a thought:
> Can you check in kernel config (os/linux/.config) what value you
> have on CONFIG_ETRAX_DEF_R_BUS_CONFIG? If you have 104 you can
> test to change it to just 04 (by doing make menuconfig in os/linux
> and change under Hardware settings. Then do make kernel && make images
> in the top directory). If you  do this I would like to know if that
> makes any difference.
>
> (There is a bug in ETRAX 100LX that may hit you when bit 8 in
> BUS_CONFIG is set and you run some types of USB traffic).
>
> /Mikael
>
> -----Original Message-----
> From: owner-dev-etrax@xxxxxxx.com">mailto:owner-dev-etrax@xxxxxxx.com] On
> Behalf Of cedric.stevens@xxxxxxx.za
> Sent: Wednesday, May 19, 2004 7:18 AM
> To: Orjan Friberg; dev-etrax
> Cc: Henrik Eriksson
> Subject: Re: MMU Bus fault
>
>
> Hi Orjan
>
> One final question.
>
> We are still trying to get to a singular problem definition where I know
> at
> least which module contains the problem. We've seen something work and
> are
> still trying to prove under which scenarios we have a working system.
> Apart
> from that we do not know whether the problem is with the axis usb driver
> or
> with the device driver.
>
> Could you provide me with some overview so that we can understand what
> the
> problem may be.
>
> Regards
>
> Cedric
> ----- Original Message -----
> From: "Orjan Friberg" <orjan.friberg@xxxxxxx.com>
> To: <cedric.stevens@xxxxxxx.za>
> Cc: <dev-etrax@xxxxxxx.com>
> Sent: Monday, May 17, 2004 4:18 PM
> Subject: Re: MMU Bus fault
>
>
> > cedric.stevens@xxxxxxx.za wrote:
> > > Hi Orjan
> > >
> > > USB Port 1 disabled.
> > >
> > > The interface works perfect. Thank you.
> > >
> > > No. Please explain why both USB Ports can not function together.
> Also,
> my
> > > ethenet port 0 is still fully functional.
> >
> > The two USB ports *should* function together - I've run a second
> > USB-to-Ethernet device, as well as a USB mass storage device on port
> 2,
> > in addition to the built-in USB-to-Ethernet device on port 1.  So,
> > there's no general problem running traffic on both ports.  (Ethernet
> > port 0 is not connected via USB, so that's why it's not affected by
> > disabling USB port 1.)
> >
> > Without a device such as yours at hand, it will be difficult to say
> > what's wrong.  Please contact Fredrik Norrman
> (fredrik.norrman@xxxxxxx.com)
> > if this is something you want fixed.
> >
> > --
> > Orjan Friberg
> > Axis Communications
> >
> >
>
>