http://www.google.com/nexus/9/
The processor is: https://en.wikipedia.org/wiki/Project_Denver
I wonder how hackable this is.
Rich.
On Wed, Oct 15, 2014 at 6:48 PM, Richard W.M. Jones rjones@redhat.com wrote:
http://www.google.com/nexus/9/
The processor is: https://en.wikipedia.org/wiki/Project_Denver
I wonder how hackable this is.
It all comes down to how locked down the bootloader is. Denver support isn't upstream yet but there's been a bunch of prep for it landing in 3.18 and it shares a bunch of stuff with it's 32 bit K1 counterpart. I believe they're pin compatible so it's possible before long there will be a 64 bit Jetson board too.
Peter
On 16 October 2014 10:40, Peter Robinson pbrobinson@gmail.com wrote:
On Wed, Oct 15, 2014 at 6:48 PM, Richard W.M. Jones rjones@redhat.com wrote:
http://www.google.com/nexus/9/
The processor is: https://en.wikipedia.org/wiki/Project_Denver
I wonder how hackable this is.
It all comes down to how locked down the bootloader is. Denver support isn't upstream yet but there's been a bunch of prep for it landing in 3.18 and it shares a bunch of stuff with it's 32 bit K1 counterpart. I believe they're pin compatible so it's possible before long there will be a 64 bit Jetson board too.
Peter _______________________________________________ arm mailing list arm@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/arm
The Non-US version of the Samsung Glaxy Note4 is powered by the Exynos7, which is an Octa Core A57/A53 in big.LITTLE config. There are patches online to enable all 8 cores, but I don't have the link to hand. This may not be as hackable as the Nexus9, the fact that it is Exynos may be an issue for some, the fact that the GPU is Mali is also an issue for some, and obviously the price difference is also an issue for some. I'm not saying it's perfect, but it does provide another option.
More info on the Exynos 7 - https://www.samsung.com/global/business/semiconductor/minisite/Exynos/w/solu...
On Fri, Oct 17, 2014 at 08:39:03AM +0100, Andrew Wafaa wrote:
The Non-US version of the Samsung Glaxy Note4 is powered by the Exynos7, which is an Octa Core A57/A53 in big.LITTLE config. There are patches online to enable all 8 cores, but I don't have the link to hand. This may not be as hackable as the Nexus9, the fact that it is Exynos may be an issue for some, the fact that the GPU is Mali is also an issue for some, and obviously the price difference is also an issue for some. I'm not saying it's perfect, but it does provide another option.
That's interesting -- I seem to have missed this when it was announced.
I have mixed feelings about big.LITTLE based on my experience with the (older, 32 bit) 5410. Linux still doesn't appear to have learned how to drive the cores directly without the "switcher" (I have not tried any non-upstream patches however). OTOH it's very very fast indeed, by far the fastest 32 bit ARM I have used.
Rich.
W dniu 17.10.2014 o 09:56, Richard W.M. Jones pisze:
On Fri, Oct 17, 2014 at 08:39:03AM +0100, Andrew Wafaa wrote:
The Non-US version of the Samsung Glaxy Note4 is powered by the Exynos7, which is an Octa Core A57/A53 in big.LITTLE config.
Note4 with Qualcomm cpu is not US only device. So if you want to buy it with Exynos7 you have to check exactly what you buy.
I have mixed feelings about big.LITTLE based on my experience with the (older, 32 bit) 5410.
IIRC 5410 had wrong implementation of big.LITTLE or atleast incompatible with what came in all other cpus.
On Fri, Oct 17, 2014 at 10:06:22AM +0200, Marcin Juszkiewicz wrote:
W dniu 17.10.2014 o 09:56, Richard W.M. Jones pisze:
On Fri, Oct 17, 2014 at 08:39:03AM +0100, Andrew Wafaa wrote:
The Non-US version of the Samsung Glaxy Note4 is powered by the Exynos7, which is an Octa Core A57/A53 in big.LITTLE config.
Note4 with Qualcomm cpu is not US only device. So if you want to buy it with Exynos7 you have to check exactly what you buy.
I have mixed feelings about big.LITTLE based on my experience with the (older, 32 bit) 5410.
IIRC 5410 had wrong implementation of big.LITTLE or atleast incompatible with what came in all other cpus.
.. and is rumoured to be broken (caching bugs) although I've not experienced anything on mine.
Rich.
The Non-US version of the Samsung Glaxy Note4 is powered by the Exynos7, which is an Octa Core A57/A53 in big.LITTLE config.
Note4 with Qualcomm cpu is not US only device. So if you want to buy it with Exynos7 you have to check exactly what you buy.
I have mixed feelings about big.LITTLE based on my experience with the (older, 32 bit) 5410.
IIRC 5410 had wrong implementation of big.LITTLE or atleast incompatible with what came in all other cpus.
.. and is rumoured to be broken (caching bugs) although I've not experienced anything on mine.
We currently don't support any form of little.BIG in Fedora. Until recently the only SoCs that supported it were exynos based and their support for multiprocessor kernels was terrible let alone some of their more exotic features. There are now other devices out there with the technology and dev boards with it on board but again most of that support isn't upstream, eg AllWinner A80 basic support isn't upstream yet.
The other SoC with similar technology is Tegra and while their upstream support overall is generally very good there doesn't appear to be any drivers etc for scaling between their single companion core and the rest.
While the technology is cute it is very much designed for the mobile phone/tablet market to save battery when in the pocket but to have enough power to play/record hi def video and hence in the short term I don't believe it really fits our use case and hence I've not spent much more time than the occasional cursory glance to see if it's any less broken. Besides, after a couple of months, I'm yet to get any positive confirmation that people are actually able to use our kernel with any Exynos based device.
Peter
On 17 October 2014 17:28:03 GMT+08:00, Peter Robinson pbrobinson@gmail.com wrote:
The Non-US version of the Samsung Glaxy Note4 is powered by the Exynos7, which is an Octa Core A57/A53 in big.LITTLE config.
Note4 with Qualcomm cpu is not US only device. So if you want to buy
it
with Exynos7 you have to check exactly what you buy.
I have mixed feelings about big.LITTLE based on my experience with
the
(older, 32 bit) 5410.
IIRC 5410 had wrong implementation of big.LITTLE or atleast
incompatible
with what came in all other cpus.
.. and is rumoured to be broken (caching bugs) although I've not experienced anything on mine.
We currently don't support any form of little.BIG in Fedora. Until recently the only SoCs that supported it were exynos based and their support for multiprocessor kernels was terrible let alone some of their more exotic features. There are now other devices out there with the technology and dev boards with it on board but again most of that support isn't upstream, eg AllWinner A80 basic support isn't upstream yet.
The other SoC with similar technology is Tegra and while their upstream support overall is generally very good there doesn't appear to be any drivers etc for scaling between their single companion core and the rest.
While the technology is cute it is very much designed for the mobile phone/tablet market to save battery when in the pocket but to have enough power to play/record hi def video and hence in the short term I don't believe it really fits our use case and hence I've not spent
Not specifically about exynos, but it does make some difference about thermal behaviour which affects performance by limiting cpufreq if it gets hot, so it's not just a sideshow if your device is fanless.
-Andy
much more time than the occasional cursory glance to see if it's any less broken. Besides, after a couple of months, I'm yet to get any positive confirmation that people are actually able to use our kernel with any Exynos based device.
Peter _______________________________________________ arm mailing list arm@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/arm
-
Andrew Wafaa -
Andy Green -
Marcin Juszkiewicz -
Peter Robinson -
Richard W.M. Jones