Building for Raspberry Pi Ubuntu

[buzz heavyyear]

Hi Norman,
Thanks very much for taking time to reply to my miserable attempts at getting up to speed on Genode and RPi.
I hope to get back to you with an optimised driver for genode over the next few days.
Very bestNick

> Date: Mon, 2 Dec 2013 11:50:38 +0100
> From: norman.feske at ...1...
> To: genode-main at lists.sourceforge.net
> Subject: Re: Building for Raspberry Pi Ubuntu
> 
> Hi Nick,
> 
> on the Raspberry Pi, the network connector is attached to the SoC via a
> network-over-USB solution, similar to the Pandaboard. Technically, the
> network driver is already included in the current version of Genode. The
> relevant commit is:
> 
> 
> https://github.com/genodelabs/genode/commit/93c7e852e94a1fd0374b4da218461ace560e51a8
> 
> However, as stated in the commit message, even though the driver shows
> some signs of life (e.g., some blinking LEDs), it remains largely
> untested and might need some debugging. To give it a try, I recommend to
> take the 'libports/run/lwip.run' script as starting point and follow the
> way of how the script works for omap4 (Panda). I.e., take a close look
> at the configuration of the USB driver.
> 
> That said, I am afraid that the current version of the USB driver will
> not yield stellar networking performance. Because of the strange way of
> how the DWC-OTG host controller works, there is an extremely high
> interrupt load on the system (circa 8000 IRQs per second even when USB
> is idle), draining the CPU. On Linux, the RPI developers came up with
> pretty creative hacks to make the situation bearable, in particular
> handling most of the interrupts via a FIQ handler and reflecting just a
> few IRQs to the actual host-controller driver via the MPHI device.
> Please have a look at the commit history for the driver [1] and the
> explanation by one of the authors [2] - it is pretty insightful:
> 
> [1] https://github.com/nfeske/dwc_otg/commits/r1
> [2] http://comments.gmane.org/gmane.linux.kernel.rpi/438
> 
> So far, the Genode version of the driver does not use those performance
> optimizations.
> 
> Cheers
> Norman
> 
> 
> On 11/30/2013 01:51 PM, buzz heavyyear wrote:
> > Actually, just one question ... Am I right in thinking that there are no
> > Ethernet/nic drivers for  RPI in Genode?
> > 
> > Cheers
> > Nick
> > 
> > --- Original Message ---
> > 
> > From: "buzz heavyyear" <buzzheavyyear at ...16...>
> > Sent: 30 November 2013 11:59
> > To: "genode-main-lists" <genode-main at lists.sourceforge.net>
> > Subject: RE: Building for Raspberry Pi Ubuntu
> > 
> > Thanks Christian, looks like I'm going to have to start digging into
> > RPi's drivers. Should be able to avoid dde_ipxe in that case.
> > 
> > Thanks again
> > 
> > Cheers
> > Nick
> > 
> >> Subject: RE: Building for Raspberry Pi Ubuntu
> >> From: christian.helmuth at ...1...
> >> Date: Sat, 30 Nov 2013 12:50:49 +0100
> >> To: genode-main at lists.sourceforge.net
> >>
> >> Hi,
> >>
> >> Seems you're missing the driver for RPi's NIC since such a driver is
> > AFAIK not part of our repos. BTW dde_ipxe is only enabled for x86
> > platforms with PCI networking hardware.
> >>
> >> Greets
> >> --
> >> Christian Helmuth
> >> Genode Labs
> >>
> >> http://www.genode-labs.com/ · http://genode.org/ · /ˈdʒiː.nəʊd/
> >>
> >> Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
> >> Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
> 
> -- 
> Dr.-Ing. Norman Feske
> Genode Labs
> 
> http://www.genode-labs.com · http://genode.org
> 
> Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
> Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
> 
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