Re: New Pi Quad Core

[alan.cudmore at gmail.com]

I think this will be possible. I just tried a few bare metal assembly demos on the Pi A+ and Pi2 and it looks like even without the published CPU datasheet, they have things figured out.


For example: An assembly SMP NEON fractal demo:

https://github.com/PeterLemon/RaspberryPi/tree/master/SMP/NEON/Fractal/Julia



Another interesting thing: The same SD card firmware works for both the Pi and Pi2. The Pi2 boots kernel7.img, and the pi looks for kernel.img. 



Alan








From: Joel Sherrill
Sent: ‎Thursday‎, ‎March‎ ‎5‎, ‎2015 ‎1‎:‎42‎ ‎PM
To: rtems-devel at rtems.org, Alan Cudmore





Hi

I am going to go back on what I said earlier. The online discussion
seems to indicate that the BCM2836 has the same peripherals
as the BCM2835 on the previous Pi Models. But they are at
physical address 0x3F000000 rather than the 0x20000000.
The CPU core is a different ARM level.

Since people are having luck on the net and the source
for Linux can always be consulted if there are specific
register issues we can't figure out, I *THINK* that a
BSP variant for this makes sense as a GSoC project.

That would be an additional project to bring up the single
core as step 1, support SMP and test drivers done on other
single core Pi project. Maybe by the end of the summer ,
both can be supported with the same driver set.

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
Support Available                (256) 722-9985
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