Date: Fri, 10 Feb 2017 16:40:03 -0800 (PST) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Oleksandr Tymoshenko <gonzo@bluezbox.com> Cc: Karl Denninger <karl@denninger.net>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Pi3 vchiq driver? Message-ID: <201702110040.v1B0e314095891@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <20170210221953.GA54179@bluezbox.com>
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Yet one more reason that we should be building a 32bit os for the RPI3 too. The board only has 1GByte of memory, so wasting 32bits for all those 64bit points.. is.. well a waste! Not only in the limited resource of memory, but cache, and memory bandwidth. I know, its neat to play with 64 bit SMP code on a tiny little board, but its wastefull! > Karl Denninger (karl@denninger.net) wrote: > > I assume this will provide the audio service (which is currently not > > available) on the Pi3. > > > > Attempting to include it results in a handful of compilation errors. > > They'd be easy to fix for the instant case but generalizing them so they > > ALSO compile on the Pi2 would likely be a good idea, and I'm > > less-certain on the "right" way to do that. > ... skipped ... > > Guidance? > > VCHI driver is designed for 32-bit system. It passes pointers as opaque > values to VideoCore and expectes them mirrored back and reused as > pointers. This is not going to work on 64-bit system. It can be fixed > but it's not a matter of adding more #ifdefs some additional logic > required. There is also a matter of userland-facing API which is not > relevant for audio driver but relevant for OpenGL and other parts of > raspberrypi-userland port. > > I have some work in progress but it's far from proper state. > > -- > gonzo > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" > -- Rod Grimes rgrimes@freebsd.org
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