[Arm-netbook] RK3288

[Luke Kenneth Casson Leighton]

i still have to write it up but i've discovered that it's possible to
obtain PCB CAD files on taobao for the RK3288. with mike's help (and
around $20) i've been working for the past 4 days on an EOMA68-RK3288
board. the RK3288 apparently supports up to 4GB of RAM, which is the
primary reason why i'm looking at it at the same time as the nexell
S5P6818 (which is 8-core but only does up to 2GB RAM).

the RK3288 was apparently designed for chromebooks, hence the
increased RAM. what's nice is that i have the assistance of an
engineer who works for rockchip, thanks to an introduction. i'll be
arranging to go visit their HQ in a few weeks, to say hello.

l.

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[Matt Campbell]

Sounds promising. Just curious, how does the power consumption of the
RK3288 compare to the A20?

Thanks,
Matt

Post by Luke Kenneth Casson Leighton
i still have to write it up but i've discovered that it's possible to
obtain PCB CAD files on taobao for the RK3288. with mike's help (and
around $20) i've been working for the past 4 days on an EOMA68-RK3288
board. the RK3288 apparently supports up to 4GB of RAM, which is the
primary reason why i'm looking at it at the same time as the nexell
S5P6818 (which is 8-core but only does up to 2GB RAM).
the RK3288 was apparently designed for chromebooks, hence the
increased RAM. what's nice is that i have the assistance of an
engineer who works for rockchip, thanks to an introduction. i'll be
arranging to go visit their HQ in a few weeks, to say hello.
l.
---
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[Luke Kenneth Casson Leighton]

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Sounds promising. Just curious, how does the power consumption of the RK3288
compare to the A20?

don't know yet, but the PMIC does 3A @ 1V (!!) for the CPU and the
same amount for the GPU (!).

it'll almost certainly have to be down-clocked to 1ghz, or a special
cpufreq arrangement to be made where 2 cores are allowed to run up to
the maximum 1.8ghz and the other two are capped at say 400mhz or less,
something like that.

it's a 4-core 28nm where the A20 was a 2-core 40nm, so that's a 1/2
power-saving factor... running at 1ghz should be a roughly equal power
consumption.... but the RK3288 is an A17, the A20 is an A7.

just have to see how it goes, basically.

l.

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[GaCuest]

El 14 de noviembre de 2016 a las 19:27:40, Luke Kenneth Casson

Post by Luke Kenneth Casson Leighton
i still have to write it up but i've discovered that it's possible to
obtain PCB CAD files on taobao for the RK3288. with mike's help (and
around $20) i've been working for the past 4 days on an EOMA68-RK3288
board. the RK3288 apparently supports up to 4GB of RAM, which is the
primary reason why i'm looking at it at the same time as the nexell
S5P6818 (which is 8-core but only does up to 2GB RAM).
the RK3288 was apparently designed for chromebooks, hence the
increased RAM. what's nice is that i have the assistance of an
engineer who works for rockchip, thanks to an introduction. i'll be
arranging to go visit their HQ in a few weeks, to say hello.

The GPU seems very interesting. Supports OpenGL ES 3.2 and Vulkan 1.0.

Are all components supported under GNU/Linux (with proprietary drivers)?

Thanks.

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[Luke Kenneth Casson Leighton]

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Post by GaCuest
El 14 de noviembre de 2016 a las 19:27:40, Luke Kenneth Casson

Post by Luke Kenneth Casson Leighton
i still have to write it up but i've discovered that it's possible to
obtain PCB CAD files on taobao for the RK3288. with mike's help (and
around $20) i've been working for the past 4 days on an EOMA68-RK3288
board. the RK3288 apparently supports up to 4GB of RAM, which is the
primary reason why i'm looking at it at the same time as the nexell
S5P6818 (which is 8-core but only does up to 2GB RAM).
the RK3288 was apparently designed for chromebooks, hence the
increased RAM. what's nice is that i have the assistance of an
engineer who works for rockchip, thanks to an introduction. i'll be
arranging to go visit their HQ in a few weeks, to say hello.

The GPU seems very interesting. Supports OpenGL ES 3.2 and Vulkan 1.0.
Are all components supported under GNU/Linux (with proprietary drivers)?

honestly that's something i'm going to have to leave for someone else
to investigate / answer, i've been non-stop for about 6 days on the
PCB layout, it's one of the trickiest i've ever done as the 4 DDR3x16
RAM ICs are all on the TOP layer, leaving an absolutely ridiculously
small amount of space left for routing, and i'm having to make some
rather creative decisions on where to place some of the discrete
components.

it's extremely taxing, very intensive, so i'm trusting that other
people will answer software-related questions.

l.

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[GaCuest]

El 15 de noviembre de 2016 a las 17:33:27, Luke Kenneth Casson

Post by Luke Kenneth Casson Leighton
honestly that's something i'm going to have to leave for someone else
to investigate / answer, i've been non-stop for about 6 days on the
PCB layout, it's one of the trickiest i've ever done as the 4 DDR3x16
RAM ICs are all on the TOP layer, leaving an absolutely ridiculously
small amount of space left for routing, and i'm having to make some
rather creative decisions on where to place some of the discrete
components.
it's extremely taxing, very intensive, so i'm trusting that other
people will answer software-related questions.

Ok, thanks, and good luck!

The RK3288 seems very interesting if all the components if supported
under GNU/Linux (at least with proprietary drivers).

On the other hand, have you calculated the approximate price of an
EOMA68 based on RK3288?

Thanks.

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[Luke Kenneth Casson Leighton]

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Post by GaCuest
El 15 de noviembre de 2016 a las 17:33:27, Luke Kenneth Casson

Post by Luke Kenneth Casson Leighton
honestly that's something i'm going to have to leave for someone else
to investigate / answer, i've been non-stop for about 6 days on the
PCB layout, it's one of the trickiest i've ever done as the 4 DDR3x16
RAM ICs are all on the TOP layer, leaving an absolutely ridiculously
small amount of space left for routing, and i'm having to make some
rather creative decisions on where to place some of the discrete
components.
it's extremely taxing, very intensive, so i'm trusting that other
people will answer software-related questions.

Ok, thanks, and good luck!
The RK3288 seems very interesting if all the components if supported
under GNU/Linux (at least with proprietary drivers).
On the other hand, have you calculated the approximate price of an
EOMA68 based on RK3288?

not at all: i've literally gone straight from learning of the
existence of the RK3288 to starting the PCB layout in under 24 hours.
i'm working on the assumption that a higher-end processor, larger
amount of RAM and larger amount of NAND (eMMC) will be desirable
regardless of cost. the required RAM ICs to reach 4 GB RAM are going
to be the $9 *PER RAM IC* variants. that's $36 just in RAM ICs - more
than the entire BOM for the EOMA68-A20. 32gb eMMC is also going to be
equally costly, and likewise the processor.

l.

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[Paul Boddie]

El 15 de noviembre de 2016 a las 17:33:27, Luke Kenneth Casson Leighton

Post by Luke Kenneth Casson Leighton
it's extremely taxing, very intensive, so i'm trusting that other
people will answer software-related questions.

I'm not expecting you to field these questions while you're in the zone doing
the hardware, that's for sure!

Ok, thanks, and good luck!
The RK3288 seems very interesting if all the components if supported
under GNU/Linux (at least with proprietary drivers).

One worrying thing I read recently was that Lima driver development for the
Mali technologies bundled by ARM and appearing in various SoCs, which might
include this one, has stalled mostly because the developer has found it
difficult to remain motivated:

http://libv.livejournal.com/27461.html

Given the way he has been treated over the years, particularly by ARM and
various partner organisations, I find that understandable.

There do appear to be "open source" components for Mali developed by ARM,
albeit not supporting things like OpenGL:

http://malideveloper.arm.com/resources/drivers/open-source-mali-gpus-linux-
exadri2-and-x11-display-drivers/

Maybe someone here can provide us with an explanation of the situation, what
amongst the stuff being offered on the wider Internet is actually "libre" or
complete, and whether the "open source" stuff still requires proprietary
firmware, anyway.

Paul

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[Luke Kenneth Casson Leighton]

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Post by Paul Boddie

El 15 de noviembre de 2016 a las 17:33:27, Luke Kenneth Casson Leighton

Post by Luke Kenneth Casson Leighton
it's extremely taxing, very intensive, so i'm trusting that other
people will answer software-related questions.

I'm not expecting you to field these questions while you're in the zone doing
the hardware, that's for sure!

Ok, thanks, and good luck!
The RK3288 seems very interesting if all the components if supported
under GNU/Linux (at least with proprietary drivers).

One worrying thing I read recently was that Lima driver development for the
Mali technologies bundled by ARM and appearing in various SoCs, which might
include this one, has stalled mostly because the developer has found it

that's an understatement.

Post by Paul Boddie
http://libv.livejournal.com/27461.html
Given the way he has been treated over the years, particularly by ARM and
various partner organisations, I find that understandable.

a $40 billion dollar company threatening a single individual, by
blackmailing the company that funded him? that kind of completely
inappropriate and completely unethical behaviour doesn't end well.

Post by Paul Boddie
There do appear to be "open source" components for Mali developed by ARM,
http://malideveloper.arm.com/resources/drivers/open-source-mali-gpus-linux-
exadri2-and-x11-display-drivers/
Maybe someone here can provide us with an explanation of the situation, what
amongst the stuff being offered on the wider Internet is actually "libre" or
complete, and whether the "open source" stuff still requires proprietary
firmware, anyway.

"Note that these components are not a complete driver stack. To build
a functional OpenGL ES or OpenVG driver you need access to the full
source code of the Mali GPU DDK, which is provided under the standard
ARM commercial licence to all Mali GPU customers. For a complete
integration of the Mali GPU DDK with the X11 environment refer to the
Integration Guide supplied with the Mali GPU DDK.

The open source code provided on this page is designed to run with a
version-compatible release of the Mali GPU DDK (currently r2p1). They
also require the MaliDRM component also available from this page. By
releasing this software under the MIT licence we hope to make it
easier to include Mali GPU drivers in any Linux platform."

answer: no.

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[Mike Leimon]

Regarding the RK3288, allow me to redirect your attention to a page on the
archlinuxARM website:

https://archlinuxarm.org/platforms/armv7/rockchip/asus-chromebook-flip-c100p

The ASUS Chromebook Flip uses the RK3288 processor and has at least some
degree of support on the Linux side or I don't think the ArchlinuxARM guys
would have been able to support the platform. Anyhow, perhaps you guys can
find out some useful info from the associated installation and wiki pages
for this system.

-Mike

[Luke Kenneth Casson Leighton]

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Post by Mike Leimon
Regarding the RK3288, allow me to redirect your attention to a page on the
https://archlinuxarm.org/platforms/armv7/rockchip/asus-chromebook-flip-c100p

briiilliant, thanks mike.

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