Denx vs kernel.org

Denx vs kernel.org

[Matt Jerdonek]

I'm looking at embedding linux into a PowerPC-based
system.  I found the DENX website to be very helpful,
but I'm struggling to understand a few items:

1) The source from kernel.org appears to have support
for the powerpc (arch/powerpc/8xx_io).  But when using
'make xconfig' I cannot select PowerPC from the list
of processors.  Is this just a limitation on the the
configuration utility?

2) What is the difference between the sources on DENX
and kernel.org?  Are there other places where PPC
linux kernel source is stored?  I'm not opposed to
using the DENX source, I'm just trying to understand
it.

3) I've used eCos before and I'm familiar with
RedBoot.  Is there a compelling reason to use U-Boot
over RedBoot?  For example, I think U-boot contains an
NFS client while RedBoot does not.  Is this important?

Thanks in advance,
-- Matt


		
__________________________________________ 
Yahoo! DSL – Something to write home about. 
Just $16.99/mo. or less. 
dsl.yahoo.com 

Re: Denx vs kernel.org

[White]

Am Tue, 6 Dec 2005 08:42:12 -0800 (PST) schrieb Matt Jerdonek
<maj1224@yahoo.com> :

Hello
> I'm looking at embedding linux into a PowerPC-based
> system.  I found the DENX website to be very helpful,
> but I'm struggling to understand a few items:
Welcome to our Club :)

> 
> 1) The source from kernel.org appears to have support
> for the powerpc (arch/powerpc/8xx_io).  But when using
> 'make xconfig' I cannot select PowerPC from the list
> of processors.  Is this just a limitation on the the
> configuration utility?
Try setting ARCH=ppc or so...
make ARCH=ppc CROSS_COMPILE=xxx  menuconfig uImage and so on

> 
> 2) What is the difference between the sources on DENX
> and kernel.org?  Are there other places where PPC
> linux kernel source is stored?  I'm not opposed to
> using the DENX source, I'm just trying to understand
> it.
> 

The Kernel Source is tested and released from many Developers.
The Denx Kernel is a kind of specialized.

Some parts are missing, some special patches aare in this Kernel,
the Mainstream Kernel developer dont want to add.

There are Other Sources too. 

Google or some Docu Site fpr ppc linux can help.

> 3) I've used eCos before and I'm familiar with
> RedBoot.  Is there a compelling reason to use U-Boot
> over RedBoot?  For example, I think U-boot contains an
> NFS client while RedBoot does not.  Is this important?

i'm booting the kernel in uboot over tftp.
You dont need nfs in u-boot...

i dont know redboot, but in uboot you can do many diagnostoc or
maintaining work at the Console.

Its easy to extend by special needs and support a lot of platforms.



> 
> Thanks in advance,
> -- Matt


Good luck...

Re: Denx vs kernel.org

[Wolfgang Denk]

In message <20051206164212.82779.qmail@web33505.mail.mud.yahoo.com> you wrote:
> I'm looking at embedding linux into a PowerPC-based
> system.  I found the DENX website to be very helpful,
> but I'm struggling to understand a few items:

It would be helpful if you precisely stated which of the  misc  trees
you are talking about.

> 1) The source from kernel.org appears to have support
> for the powerpc (arch/powerpc/8xx_io).  But when using
> 'make xconfig' I cannot select PowerPC from the list
> of processors.  Is this just a limitation on the the
> configuration utility?

Seems like you are trying to use the linux-2.6-denx tree  and  forgot
to  pass  a "ARCH=ppc" argument to "make" (and did not set "ARCH=ppc"
in your shell environment either).

> 2) What is the difference between the sources on DENX
> and kernel.org?  Are there other places where PPC

We have some stuff added which was submitted as patches to  the  list
but  not  all  of  this  has  been  accepted  for  or merged into the
kernel.org tree yet.

> linux kernel source is stored?  I'm not opposed to
> using the DENX source, I'm just trying to understand
> it.

You may want to read http://penguinppc.org/kernel/

> 3) I've used eCos before and I'm familiar with
> RedBoot.  Is there a compelling reason to use U-Boot
> over RedBoot?  For example, I think U-boot contains an
> NFS client while RedBoot does not.  Is this important?

U-Boot contains a lot more. If these features are  important  to  you
depends on what you want to do.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
The thing is, as you progress in the Craft,  you'll  learn  there  is
another rule... When you break rules, break 'em good and hard.
                                    - Terry Pratchett, _Wyrd Sisters_

Re: Denx vs kernel.org

[Marcelo Tosatti]

On Tue, Dec 06, 2005 at 10:14:59PM +0100, Wolfgang Denk wrote:
> In message <20051206164212.82779.qmail@web33505.mail.mud.yahoo.com> you wrote:
> > I'm looking at embedding linux into a PowerPC-based
> > system.  I found the DENX website to be very helpful,
> > but I'm struggling to understand a few items:
> 
> It would be helpful if you precisely stated which of the  misc  trees
> you are talking about.
> 
> > 1) The source from kernel.org appears to have support
> > for the powerpc (arch/powerpc/8xx_io).  But when using
> > 'make xconfig' I cannot select PowerPC from the list
> > of processors.  Is this just a limitation on the the
> > configuration utility?
> 
> Seems like you are trying to use the linux-2.6-denx tree  and  forgot
> to  pass  a "ARCH=ppc" argument to "make" (and did not set "ARCH=ppc"
> in your shell environment either).
> 
> > 2) What is the difference between the sources on DENX
> > and kernel.org?  Are there other places where PPC
> 
> We have some stuff added which was submitted as patches to  the  list
> but  not  all  of  this  has  been  accepted  for  or merged into the
> kernel.org tree yet.

Hi Wolfgang,

Is there a list of your fixes anywhere? Is the linux-2.6-denx tree
public?

Re: Denx vs kernel.org

[Kumar Gala]

> Hi Wolfgang,
>
> Is there a list of your fixes anywhere? Is the linux-2.6-denx tree
> public?


http://www.denx.de/cgi-bin/gitweb.cgi?p=linux-2.6-denx.git

- kumar

Re: Denx vs kernel.org

[Wolfgang Denk]

In message <20051208143149.GA14554@dmt.cnet> you wrote:
>
> Is there a list of your fixes anywhere? Is the linux-2.6-denx tree
> public?

There is no formal list except for the hGIT history, or the  postings
on tthis list. If you like, I can easily prepare a summary.

And yes, of course our tree is publicly available. See
http://www.denx.de/cgi-bin/gitweb.cgi?p=linux-2.6-denx.git
resp.  {rsync,http}://www.denx.de/git/linux-2.6-denx.git

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
My challenge to the goto-less programmer  is  to  recode  tcp_input()
without any gotos ... without any loss of efficiency (there has to be
a catch).                                             - W. R. Stevens