Carsten, There is any posibility to change the screen resolution without reboot? If we can do so we can dinamically change it to got the best of two worlds, a high resolution for almost statical screens to webbrowsing, doc editing, picture viewing, an a low resolution to mame, video playback(?), and anything else doesn't fit on high res. It can be done?
Regards --- El vie, 6/6/08, Carsten Haitzler <[EMAIL PROTECTED]> escribió: > De: Carsten Haitzler <[EMAIL PROTECTED]> > Asunto: Re: Yummy new CPU/GPU combo > Para: "List for Openmoko community discussion" <community@lists.openmoko.org> > CC: "Tom Cooksey" <[EMAIL PROTECTED]> > Fecha: viernes, 6 junio, 2008 4:36 > On Thu, 5 Jun 2008 12:56:00 +0200 Tom Cooksey > <[EMAIL PROTECTED]> > babbled: > > > Well... yeah, that's kindof the reason for the > initial post! I must have > > misunderstood previous posts as I was convinced the > glamo was itself attached > > to the CPU's SDIO interface. You can understand > where I was coming from now! > > :) > > > Right. Shame the cpu doesn't have more cache so it > has a better change of > > getting on with something else while the DMA occurs. > > > > Thanks for clearing things up. It's good to hear > that the problem isn't > > because of any particularly bad decision on > OpenMoko's part. Renews my faith > > a little. :-) > > glamo is a fairly old graphics cpu and design. frankly it > was designed for qvga > - at best. it CAN do vga, but that is beyond its intended > use. we have pushed > it much farther than smedia intended it to be - even smedia > is amazed at the > bus speeds we get to the glamo - they have never seen it so > fast. > > glamo turned up primarily for 2 reasons. > > 1. we added wifi - and we just didn't have any other > (good) interfaces (we can > sit and discuss spi all u like right now - but lets hold > that thought). so we > needed to use up our sdio port for... wifi - but where will > we stick the actual > sd card? glamo came with its own sd interface - bonus, so > we get that back > again. > > 2. refresh. we run a vga screen. 640x480x70x2 - 41mb/sec > ... JUST to refresh > the screen. we lost 41mb/sec of memory bandwidth just to > keep the screen > displaying on the gta01. vga was by far pushing what the > soc can do. literally > that is a huge amount of the bandwidth we had left (as its > reads only and we > clock @ 100mhz for the bus clock on the gta02, it's be > about 20% of memory > bandwidth gone). the glamo removes that drain and gives u > back bandwidth... but > at another cost - the glamo's own bus and the extra > work to write acceleration > to keep as much on the glamo as possible. we definitely > don't do everything we > can on the glamo - but there is only so much time and > development effort to go > around. as such we only really knew what the glamo was like > once we had it > going reasonably, and by then - it's too late. glamo is > in. it's not going away > as there just is no alternative. > > so solutions could be: ditch vga, go to qvga, thus dropping > mem bandwidth loss > to 10mb/sec (1/4 of what it was), and now have to drive > only 1/2 the pixels in > software. end result would be much lower dpi, but much > smoother and nicer > performance. but then go all the cries of "i must have > vga!!!" (though i wonder > just how many people have good enough eyesight to really > tell the difference). > > if we want to live in the realms of such high resolution, > imho, we need to look > very carefully at a high-end soc with good on-board > graphics acceleration, but > that would have put the freerunner on hold as a product for > a looong time. so > you would all still be waiting and waiting. no one would be > talking of > production runs right now! :) > > -- > Carsten Haitzler (The Rasterman) > <[EMAIL PROTECTED]> > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community ______________________________________________ Enviado desde Correo Yahoo! La bandeja de entrada más inteligente. _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
