Questions about the cpu to glamo bus and the framebuffer

2010-06-07 Thread Rashid Kratou
Hi guys,

2 questions.

First: How wide is the bus from the cpu to the glamo gpu? It should be
clocked with 90 MHz but I read it has only 7,3 MB/s. How is that
possible? 

Second: Can I draw directly to the framebuffer. Is it possible in qtmoko
or in any other distro? I would to write a see programm that just draw
directly into it. I would like to draw in first frame just every even
line. And in the second frame only every odd line tosave bandwidth on
the bus. 

I don't know if this the right mailing list to ask for it. But maybe you
can help me :).




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Re: Questions about the cpu to glamo bus and the framebuffer

2010-06-07 Thread Fox Mulder
Am 07.06.2010 12:37, schrieb Rashid Kratou:
 Hi guys,
 
 2 questions.
 
 First: How wide is the bus from the cpu to the glamo gpu? It should be
 clocked with 90 MHz but I read it has only 7,3 MB/s. How is that
 possible? 
 
 Second: Can I draw directly to the framebuffer. Is it possible in qtmoko
 or in any other distro? I would to write a see programm that just draw
 directly into it. I would like to draw in first frame just every even
 line. And in the second frame only every odd line tosave bandwidth on
 the bus. 
 
 I don't know if this the right mailing list to ask for it. But maybe you
 can help me :).

If you take a look at the schematics of the freerunner [1] on page 12 is
the glamo multi media coprocessor (not just gpu) shown. It seems that
the data bus is 16Bit wide with 23Bit address bus. It also seems to be
hardwired to use internal PLL for clock generation so i don't know at
which speed it runs.

Ciao,
 Rainer

[1]
http://downloads.openmoko.org/developer/schematics/GTA02/Schematics_Freerunner-GTA02_A5-A7cumulative_public_RC0.pdf

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