LDD3 examples updated

LDD3 examples updated

[Javier Martinez Canillas]

Hello,

I see many people in the list asking where do I start? In my opinion
the best way to learn kernel development is first learning some basic
concepts and start coding to get your hands dirty.

The Linux Device Drivers 3 book is a good start. Both the book and
source code examples are freely available.

The problem is that the book is a few years old and the example
drivers do not compile in recent kernels.

I started a project to keep the LDD3 examples up-to-date with recent kernels.

The git tree can be cloned from git://github.com/martinezjavier/ldd3.git

I will try to keep the code always in sync with linux-next but there
will be tags to stable versions. Now there are tags that compile with
kernel versions 2.6.32, 2.6.35 and 2.6.37.

I didn't try all the drivers with the three kernel versions, just
compile tested. So any bug, comment or patch is always welcome

-- 
Best regards,

-----------------------------------------
Javier Mart?nez Canillas
(+34) 682 39 81 69

LDD3 examples updated

[Anuz Pratap Singh Tomar]

On Thu, Jan 6, 2011 at 7:45 AM, Javier Martinez Canillas <
martinez.javier@gmail.com> wrote:

> Hello,
>
> I see many people in the list asking where do I start? In my opinion
> the best way to learn kernel development is first learning some basic
> concepts and start coding to get your hands dirty.
>
> The Linux Device Drivers 3 book is a good start. Both the book and
> source code examples are freely available.
>
> The problem is that the book is a few years old and the example
> drivers do not compile in recent kernels.
>
> I started a project to keep the LDD3 examples up-to-date with recent
> kernels.
>
> The git tree can be cloned from git://github.com/martinezjavier/ldd3.git
>
> I will try to keep the code always in sync with linux-next but there
> will be tags to stable versions. Now there are tags that compile with
> kernel versions 2.6.32, 2.6.35 and 2.6.37.
>
> I didn't try all the drivers with the three kernel versions, just
> compile tested. So any bug, comment or patch is always welcome
>
Thanks Javier,
This was much needed.

Regards
anuz
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LDD3 examples updated

[Shreyansh Jain]

Hi Javier,

On Thu, Jan 6, 2011 at 1:15 PM, Javier Martinez Canillas
<martinez.javier@gmail.com> wrote:
> Hello,
>
> I see many people in the list asking where do I start? In my opinion
> the best way to learn kernel development is first learning some basic
> concepts and start coding to get your hands dirty.
>
> The Linux Device Drivers 3 book is a good start. Both the book and
> source code examples are freely available.
>
> The problem is that the book is a few years old and the example
> drivers do not compile in recent kernels.
>
> I started a project to keep the LDD3 examples up-to-date with recent kernels.
>
> The git tree can be cloned from git://github.com/martinezjavier/ldd3.git

This is indeed a commendable effort. Great work!! Thanks.

>
> I will try to keep the code always in sync with linux-next but there
> will be tags to stable versions. Now there are tags that compile with
> kernel versions 2.6.32, 2.6.35 and 2.6.37.

Do you need help in making the ldd3 files compliant for any other
kernels? Do you have any plans for others kernels (besides the
linux-next) in your mind which might need porting work - probably some
people on the list (including me) might be interested.

>
> I didn't try all the drivers with the three kernel versions, just
> compile tested. So any bug, comment or patch is always welcome
>
> --
> Best regards,
>
> -----------------------------------------
> Javier Mart?nez Canillas
> (+34) 682 39 81 69
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>

-
Shrey

LDD3 examples updated

[Greg Freemyer]

On Thu, Jan 6, 2011 at 12:08 PM, Shreyansh Jain <shrey.linux@gmail.com> wrote:
> Hi Javier,

>> I will try to keep the code always in sync with linux-next but there
>> will be tags to stable versions. Now there are tags that compile with
>> kernel versions 2.6.32, 2.6.35 and 2.6.37.
>
> Do you need help in making the ldd3 files compliant for any other
> kernels? Do you have any plans for others kernels (besides the
> linux-next) in your mind which might need porting work - probably some
> people on the list (including me) might be interested.

Note that 2.6.32 has been designated a LTS (Long Term Support) kernel
by the powers that be.

So that kernel would be good one to focus training resources on.  It
will likely be supported for several years by Redhat, Suse, Canonical,
etc.  Thus testing all the LDD3 examples with it would be very
beneficial.

ie. It is the basis of SLES 11.1 SP1, etc. so these firms are
contractually obligated to support a LTS kernel for years.  To lighten
the load, they got together and chose the 2.6.32 kernel as one they
would support together.  I think this is the first time they have
tried this approach.  I suspect they will do it again a couple years
from now.

Greg

LDD3 examples updated

[Javier Martinez Canillas]

Shrey

>>
>> I will try to keep the code always in sync with linux-next but there
>> will be tags to stable versions. Now there are tags that compile with
>> kernel versions 2.6.32, 2.6.35 and 2.6.37.
>
> Do you need help in making the ldd3 files compliant for any other
> kernels? Do you have any plans for others kernels (besides the
> linux-next) in your mind which might need porting work - probably some
> people on the list (including me) might be interested.
>
>>

Any help will be appreciate thank you very much! There are other projects that
updated the LDD3 examples but the person who was doing that lost interest and
the project was abandoned.

Before creating my repo I send a few patches to some of them but none updated
their project. I think that the LDD3 examples are a valuable resource
and keeping
an up-to-date version is very important to kernel developer newbies.

My idea is to have a community maintained project so If I don't have
more time to
maintain others will do.

Also probably I introduced bugs while changing the code so bug-fixing
its the best help now.

Thank you

-- 
Best regards

-----------------------------------------
Javier Mart?nez Canillas
(+34) 682 39 81 69

LDD3 examples updated

[Javier Martinez Canillas]

>
> Note that 2.6.32 has been designated a LTS (Long Term Support) kernel
> by the powers that be.
>
> So that kernel would be good one to focus training resources on. ?It
> will likely be supported for several years by Redhat, Suse, Canonical,
> etc. ?Thus testing all the LDD3 examples with it would be very
> beneficial.
>
> ie. It is the basis of SLES 11.1 SP1, etc. so these firms are
> contractually obligated to support a LTS kernel for years. ?To lighten
> the load, they got together and chose the 2.6.32 kernel as one they
> would support together. ?I think this is the first time they have
> tried this approach. ?I suspect they will do it again a couple years
> from now.
>
> Greg
>

I totally agree with Greg. 2.6.35 could also be a good version to
focus because people in the embedded world agreed that to reduce
fragmentation they will define kernels "Embedded Flag Versions". A
flag version will be a specific kernel version that vendors will based
their products on.

Many big players (Sony, Google, Meego, and Linaro)  will be using
2.6.35 in its upcoming products so it seems that this version will be
declare as a "flag version" for embedded use.

We can for example have three branches: 2.6.32, 2.6.35 and linux-next.

-- 
Best regards,

-----------------------------------------
Javier Mart?nez Canillas
(+34) 682 39 81 69

LDD3 examples updated

[Javier Martinez Canillas]

>
> We can for example have three branches: 2.6.32, 2.6.35 and linux-next.
>
> --

Hello,

I created two branches:

v2.6.32 that will be in sync with
git://git.kernel.org/pub/scm/linux/kernel/git/longterm/linux-2.6.32.y.git
v2.6.35 that will be in sync with
git://git.kernel.org/pub/scm/linux/kernel/git/longterm/linux-2.6.35.y.git

the branch master will be in sync with linux-next tree.

Also made some re-basing to keep the history coherent.

you can see how everything is now here: https://github.com/martinezjavier/ldd3

This way we can have the LDD3 examples working with some popular
long-term kernel versions and keeping up-to-date with the last kernel
release.

-- 
Best regards

-----------------------------------------
Javier Mart?nez Canillas
(+34) 682 39 81 69

LDD3 examples updated

[Hanumant Singh]

On Fri, Jan 7, 2011 at 5:40 PM, Javier Martinez Canillas <
martinez.javier@gmail.com> wrote:

> >
> > We can for example have three branches: 2.6.32, 2.6.35 and linux-next.
> >
> > --
>
> Hello,
>
> I created two branches:
>
> v2.6.32 that will be in sync with
> git://git.kernel.org/pub/scm/linux/kernel/git/longterm/linux-2.6.32.y.git
> v2.6.35 that will be in sync with
> git://git.kernel.org/pub/scm/linux/kernel/git/longterm/linux-2.6.35.y.git
>
> the branch master will be in sync with linux-next tree.
>
> Also made some re-basing to keep the history coherent.
>
> you can see how everything is now here:
> https://github.com/martinezjavier/ldd3
>
> This way we can have the LDD3 examples working with some popular
> long-term kernel versions and keeping up-to-date with the last kernel
> release.
>
> --
> Best regards
>
> -----------------------------------------
> Javier Mart?nez Canillas
> (+34) 682 39 81 69
>


Thanks a lot guys. I am able to compile & install kernel from source on my
linux machine. Finished with the book as well. So this seems like a very
good starting point, trying these examples against different kernel releases
and fixing them.

--Hanumant

>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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