Date: Thu, 22 Mar 2007 08:04:21 -0700 From: Sam Leffler <sam@errno.com> To: John Hay <jhay@meraka.org.za> Cc: freebsd-arm@freebsd.org Subject: Re: progress on the adi pronghorn metro board Message-ID: <46029AF5.20903@errno.com> In-Reply-To: <20070322080335.GA52745@zibbi.meraka.csir.co.za> References: <20070322080335.GA52745@zibbi.meraka.csir.co.za>
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John Hay wrote: > Hi Guys, > > With this patch I am at the stage where both an Avila 2348-4 and the > ADI Pronghorn Metro boot from the same kernel binary. The "main" stuff > is working, ie. console, ethernet and mini-pci slots. The iic bus on > the Avila is still working. The one for the Pronghorn is configured, > but I must still write a driver for their max6652 temperature/voltage > sensor before I will know if it is really working. > > The biggest difference between the 2 boards are in the 16 GPIO pins. > I think there is only 1 pin that have the same function. :-/ > > So what I did was to create a structure and then have 2 instances of > it, one with Avila values in it and one with Pronghorn values. Then > early in the boot phase, the board type gets detected and a pointer > gets set to the relevant structure. All the drivers then use this > pointer to get the correct values. The efect is that most of the > drivers needs no checks for the different boards. > > What I would like to know is, if this approach is acceptable? Should > I use different files to put the stuff in? > > My code is not finished yet, but I thought that I would like to get > some feedback. I still have to replace some of the numbers in the > structure with defined values. I would also like to try and really > probe the iic devices and not just assume that they are there. I'm not sure whether it makes sense to support different boards in a single binary (variations on a board design yes). My experience is that embedded applications are often cycle starved and giving up cycles for flexibility like this is ok only for devel/bringup. I suspect compile-time configuration is preferable. However if this flexibility is desirable it might be better to use ivar's hung off the nexus. Sam
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