Re: Resources for Linux SocketCAN

Am Mittwoch, 6. Februar 2013, 13:00:01 schrieb Dinesh Guleria:
> Thanks for replying   Heinz.

Dinesh,
It was not me who requested buildroot.
It was Bram Kerkhof


regards


> 
> >>  ideally it should be a neat and tidy
> > 
> > buildroot package for my target platform (iMX25@400Mhz), and play nice
> > with Crosstool-NG.
> 
> Are you telling about, following buildroot ?
> http://buildroot.uclibc.org/
> 
> Actually i have worked with crosstool-NG made made my cross toolchain.
> And used raspbian rootfile system for the development along with
> Scrathbox2 & QEmu.
> 
> What exactly Buildroot is capable to do ? Means it requires
> rootfile-system from the vendor or it is capable to create Kernel &
> rootfile system for us. Haven't worked with it ?
> 
> Regards,
> 
> Dinesh
> 
> On 2/6/13, Heinz-Jürgen Oertel <[email protected]> wrote:
> > Hello Dinesh,
> > 
> > Am Freitag 01 Februar 2013, 12:12:07 schrieben Sie:
> >> Hi,
> >> 
> >> Suppose there is 20 different messages in the common tx queues for a
> >> device
> >> from suppose 4 processes.
> >> My question is does SocketCAN & CAN4Linux supports message priority
> >> based transmission, or it is just FIFO.
> > 
> > can4linux has only one TX Fifo (yet).
> > There was no need to having priority based queues.
> > It should not be to difficult to add such a feature.
> > A bit more difficult would be to stop transmission of a low priority
> > frame and schedule a higher prior one for transmission.
> > 
> > I can not speak for SocketCAN, but think they have plans for it.
> > 
> >> >> Each receiving process needs its on receive queue for example
> >> >> and
> >> >> memory
> >> 
> >> for it. To mange this, at compile time yo define
> >> -DCAN_MAX_OPEN=4 in the Makefile to allow, in this example, four
> >> processes
> >> to open one physical device at the same time.
> >> Queue size too is a compile time constant.
> > 
> > This is correct. We prefer this static assign of resources.
> > 
> >> [skip more ...]
> > 
> > Regards
> > 
> >   Heinz
> > 
> > --
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