JohnSwenson wrote: > I did a quick test this morning on the BeagleBone and XMOS, with > squeezelite , without top running I get clicks every 5-10 secs or so, > and when top is running I always get a click when top refreshes. With > sox playing a wav file I get a click every 2-3 minutes and occasionally > a click from top. > > The UAC1 async seems to be solid no matter what. > > I have been looking at the freescale processors, I don't think the imx5 > line will do us good, they are just missing too many things. The imx6 > looks like it might do well for us. It has built in HDMI, S/PDIF, I2S, > ehci USB, good memory interface. There are two devel boards, both for > $399, the SABRE board looks closer to what we want, there is a good > probability that the image that runs on it will run directly on what I > want to build. Unfortunately it comes with android on the SD card so we > will have to get a linux image (they say they have them). These are > actually quite inexpensive, less than half the price of the TI ones. > > There are three reasons that keep me from being enthusiastic about > these: > 1; they do not have device library files for the tools I use, I will > have to make them myself > 2; the ball layout is not optimized to make it easy to route. This > takes an 8 layer board and more work. Fortunately we don't really use a > lot of signals > 3; only single memory port, this makes routing 2 chips (to get 512MB) > much harder > > One interesting aspect of the SABRE board is that they give you the > board layout files and encourage you to use them in your design. > Unfortunately they are the wrong format, but I can look at them and see > how they did it. This will probably help mitigate 2 and 3. > > > The AM3874 is a wonderful chip from every aspect except non ehci. Even > though it has more pins, they layout has been optimized to make it much > easier to route, AND they have the library files in the format I use. It > has two memory controlers which makes memory layout much easier AND > gives you twice the memory bandwidth. The USB controller does have > hardware scheduling but it is not ehci, without testing we don't know > whether it will work well. > > I did look at the Allwinner A10, unfortunately detailed documentation is > non existant, the only thing I can find is the 83 page "spec sheet" > which doesn't really say much. I get the impression you only get the > real data when you sign an NDA with the company, which is a little > difficult for a comunity project. It may be a great chip, but I just > get a very bad vibe from it, that things are going to be almost there > but not fully implemented properly. But you can get a cubieboard for $50 > to try it out. Getting small quantities for a project such as ours is > also going to be tough, I have not found it at any distributors and > companies such as this usually only sell in 1K lots. One interesting > aspect is that the imx6 is almost the same price for a way more capable > chip. > > I think I'm trying to convince myself that the imx6 is the way to go. If > so its $399 to get the demo board, which is a little out of my pocket > range right now. If we decide on this I will need some help from the > "community funding" part. > > John S.
There do appear to be cheaper imx6 boards appearing - this may be interesting http://wandboard.org/ ------------------------------------------------------------------------ Triode's Profile: http://forums.slimdevices.com/member.php?userid=17 View this thread: http://forums.slimdevices.com/showthread.php?t=97881 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/discuss
