On 06/19/2013 12:08 AM, Dan MacDonald wrote:
Hi Jeremy!
Thanks for your report! Pretty much what I expected, unfortunately!
On Tue, Jun 18, 2013 at 10:48 AM, Jeremy Jongepier <jeremy@xxxxxxxxxxxxxx>wrote:
On 06/18/2013 11:14 AM, Dan MacDonald wrote:
Thanks for sharing that Jeremy!
What are you going to use your 3066 for?
Hi Dan,
I'd like to use it for doing real-time lo-latency audio. Basically the
same way I'm using my Raspberry Pi.
What are your initial impressions and findings?
Ambivalent. It sure is faster than a Raspberry Pi but RK3066 based devices
have some drawbacks:
* No easy debugging access, I have yet to find the TXD pad on my RK3066.
* Fragmented development efforts. There are a gazillion git repositories
with all kinds of kernel sources, tools, etc.
* There are simply a lot of RK3066 based devices around and since RockChip
refuses to release their kernel source code people hacking on the
RK3066/RK3188 depend on third-party manufacturers that do understand how
GPL works and release parts of the code. Still there are things missing,
I'm now searching for a way to access the NAND from within Linux but there
is no source code anywhere for accessing the NAND on RK3066 based devices.
Yeah, there are pre-compiled kernel modules but those don't work on my
install.
That would seem to be the biggest issue with these devices atm but one that
should legally be resolved asap.
Whether they 'get' FLOSS or not, either way they only stand to gain from
doing as they legally, morally should.
Practically all source code added by RockChip is available, except for
the NAND kernel module. I'll send the manufacturer a mail regarding the
NAND source code. The problem is that the NAND kernel module is in the
initramfs and I get the idea that manufacturers using RK3066 based
boards all use the same NAND kernel modules, or even initramfs's,
provided by RockChip.
* Closely related to the above bullet, yesterday I decided to flash the
kernel to the kernel partition only to realize later that now I can't boot
into anything else but Linux. And I can't flash anything either because I
can't boot in the bootloader. Apparently I can short two pads and have the
device boot into recovery but that won't help me either because I've
flashed the recovery partition with, you guessed it right, a Linux kernel.
* JACK doesn't run on my device it with an external USB interface. It
starts and then the kernel crashes.
That's what I expected, seeing how little success I've had on my Pandaboard
with J2 git. Have you tried J1 too?
I only use Jack1 so it was the first thing I tried.
Thanks J!
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