What is the difference between Montavista Kernel Source and Kernel.Org Source

What is the difference between Montavista Kernel Source and Kernel.Org Source

[Mohammad Sadegh Sadri]

Hi All,

Just a simple question

I'm Going to use linux on ML403.

I want to know, what is the difference between the linux kernel source, tha=
t we download from source.mvista.com ( using git ) and the original kernel =
source code that we download from kernel.org?

In other words, Suppose that I have generated the BSP in EDK ( version 8.2.=
02 ) , and now , I copy this BSP to the root folder of kernel source obtain=
ed from kernel.org instead of mvista. Can I do the same things as mvista so=
urce in this case?

Thanks.
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RE: What is the difference between Montavista Kernel Source andKernel.Org Source

[Eric Nuckols]

>From: Mohammad Sadegh Sadri <mamsadegh@hotmail.com>
>Subject: What is the difference between Montavista Kernel Source 
>andKernel.Org Source
>Date: Sat, 17 Feb 2007 15:09:29 +0000
>
>I want to know, what is the difference between the linux kernel source, 
>that we download from source.mvista.com ( using git ) and the original 
>kernel source code that we download from kernel.org?
>
>In other words, Suppose that I have generated the BSP in EDK ( version 
>8.2.02 ) , and now , I copy this BSP to the root folder of kernel source 
>obtained from kernel.org instead of mvista. Can I do the same things as 
>mvista source in this case?


I would recommend doing a diff across the two source trees.
Since there are so many different versions and patches available, it is the 
only way to really know the true differences.  It's usually never as simple 
as just knowing based on the version numbers alone.

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Re: What is the difference between Montavista Kernel Source and Kernel.Org Source

[Dale Farnsworth]

> I'm Going to use linux on ML403.
> 
> I want to know, what is the difference between the linux kernel source,
> that we download from source.mvista.com ( using git ) and the original
> kernel source code that we download from kernel.org?

The multiple git trees hosted at source.mvista.com/git are development
trees similar to the trees hosted at www.kernel.org/git.  Contact the
individual developers for details on each tree.

Dale Farnsworth

RE: What is the difference between Montavista Kernel Source andKernel.Org Source

[Ming Liu]

Hi all,

>I want to know, what is the difference between the linux kernel source, 
that we download from source.mvista.com ( using git ) and the original 
kernel source code that we download from kernel.org?

In fact, I have a same question. I also want to know what's the most 
obvious difference between Mvista and the common kernel. In detail, is 
there any different mechanism for Montavista to make sure a better 
performance, like Ethernet? In my project, it generates a different 
ethernet performance for my general kernel from Montavista 4.01. I want to 
make sure if Montavista have something special to guarantee a higher 
performance.

Another question. Because Montavista kernel is also based on the open 
source linux kernel from the general tree, does this mean that the 
Montavista one is also open source and could be free to be distributed 
according to GPL. However as far as I know, that's not true. :)

BR
Ming

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RE: What is the difference between Montavista Kernel SourceandKernel.Org Source

[Eric Nuckols]

>From: "Ming Liu" <eemingliu@hotmail.com>
>To: mamsadegh@hotmail.com
>Subject: RE: What is the difference between Montavista Kernel 
>SourceandKernel.Org Source
>Date: Sun, 18 Feb 2007 13:54:13 +0000
>
>In fact, I have a same question. I also want to know what's the most
>obvious difference between Mvista and the common kernel. In detail, is
>there any different mechanism for Montavista to make sure a better
>performance, like Ethernet? In my project, it generates a different
>ethernet performance for my general kernel from Montavista 4.01. I want to
>make sure if Montavista have something special to guarantee a higher
>performance.
>
>Another question. Because Montavista kernel is also based on the open
>source linux kernel from the general tree, does this mean that the
>Montavista one is also open source and could be free to be distributed
>according to GPL. However as far as I know, that's not true. :)
>
>BR
>Ming


I have worked with MontaVista Pro 3.1 (2.4.20 MontaVista Linux Kernel) and 
the main (significant) differences that I saw between MontaVista and say the 
ELDK 2.4.25 kernel were:

1.  PREEMPTION PATCH was included in MontaVista 3.1
2.  MontaVista's MMU, scheduling, and forking code was different than the 
main stream.  It had some patches added in.
3.  There was quite a bit of difference between the asm-ppc trees  (i.e many 
places with board specific #define differences )
4.  Between the 2.4.20 MontaVista and the 2.4.25 ELDK, obvious driver 
improvements and kernel improvements had been added in, but I attribute that 
mostly to the jump from 2.4.20 to 2.4.25.


I had problems with the MontaVista kernel where processes were randomly 
crashing because of SIGSEGV or SIGFPEs.  I couldn't find any info on the 
internet and didn't have time to debug the kernel.  I eventually switched to 
the ELDK 2.4.25 kernel and all my random crashing problems disappeared...  
and I don't really see huge performance differences (IN MY SPECIFIC 
APPLICATION) without the kernel PREEMPTION.

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RE: What is the difference between Montavista Kernel SourceandKernel.Org Source

[Ming Liu]

Dear Eric,
Thanks for your reply first.

>>Another question. Because Montavista kernel is also based on the 
>>open
>>source linux kernel from the general tree, does this mean that the
>>Montavista one is also open source and could be free to be 
>>distributed
>>according to GPL. However as far as I know, that's not true. :)

Because you have worked for Montavista Linux, so could you please answer me 
this question? I know that anyone can distribute and modify GPL source code 
and then the modified code also obey GPL. So how about Montavista Linux? :) 
I am just a little confused with this rule.

BR
Ming

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RE: What is the difference between Montavista Kernel SourceandKernel.Org Source

[Eric Nuckols]

>From: "Ming Liu" <eemingliu@hotmail.com>
>To: jrocnuck@hotmail.com
>CC: linuxppc-embedded@ozlabs.org
>Subject: RE: What is the difference between Montavista Kernel 
>SourceandKernel.Org Source
>Date: Sun, 18 Feb 2007 16:25:55 +0000
>
>Dear Eric,
>Thanks for your reply first.
>
>>>Another question. Because Montavista kernel is also based on the open
>>>source linux kernel from the general tree, does this mean that the
>>>Montavista one is also open source and could be free to be distributed
>>>according to GPL. However as far as I know, that's not true. :)
>
>Because you have worked for Montavista Linux, so could you please answer me 
>this question? I know that anyone can distribute and modify GPL source code 
>and then the modified code also obey GPL. So how about Montavista Linux? :) 
>I am just a little confused with this rule.
>
>BR
>Ming


I only used their product (purchased a license of their tools/product).  I 
am not in a position to answer legal/licensing questions about MontaVista 
Linux.  You should contact their sales department for information regarding 
this type of question.

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Re: What is the difference between Montavista Kernel Source, and Kernel.Org Source

[Vitaly Bordug]

On Sun, 18 Feb 2007 11:20:27 +0100
Lorenz Kolb <linuxppcemb@lkmail.de> wrote:

> 
> >> I'm Going to use linux on ML403.
> >>
> >> I want to know, what is the difference between the linux kernel source,
> >> that we download from source.mvista.com ( using git ) and the original
> >> kernel source code that we download from kernel.org?
> >>     
Being brief, some Mvista patches were not merged due to various reasons 
(such as say Xilinx stuff for a while) and anyone interested can still use
that work. So for instance people asking here and in other ML's can be just referred 
to those git trees and obtain a full understanding what were done to get things work.

> >
> > The multiple git trees hosted at source.mvista.com/git are development
> > trees similar to the trees hosted at www.kernel.org/git.  Contact the
> > individual developers for details on each tree.
> >
> > Dale Farnsworth
> >
> >   
> Oh, and I thought that development does mean something like progress.
> If I'd "develop" something "new" with last change 8 months ago, I guess 
> my boss would not pay for that "development".
> 
sorry, but that is not quite right. Trees there are development stuff for 4.x MVL
product (at least ppc-related), and now active development is heading for next release.

I don't think you'll find these up-to-date sources in source.mvista.com, bit not because
of internal reasons - almost all the efforts were brought up to the community and merged 
to the stock kernel tree. 

> So what is the difference between kernel.org and montavista's tree for 
> ML403.
> 
> kernel.org is quite a bit ahead.
> 
> Personally I'd recommend Denk's 2.6.19 tree (that's a 2.6.19 from 
> kernel.org with some ppc specific patches, afaik) and patching the EDK 
> 8.2 into it. That's quite a lot of work (I am just doing that at the 
> moment) but that's the only way to get an up-to-date system.
> Currently my partner and I are working on building a minimalistic sound 
> driver and in some future release a ALSA compliant sound driver and a 
> new controller (with at least DMA support) as this is can still not be 
> found in MontaVista.
> 
Xilinx stuff is a really interesting approach. Sorry,  but I guess "patching the EDK 
8.2 into it" is not the thing maintainers are expecting to appear upstream. So, referred mvista code can 
be used as a reference, but a living solution requires careful consideration. Do some investigations,
share the thoughts and you'll not be left alone.

As a side note, most of the active work is in the mainstream kernel, MV, Denx and many others actively 
participating in it.

-- 
Sincerely, 
Vitaly