[U-Boot-Users] PPC as host

[U-Boot-Users] PPC as host

[VanBaren, Gerald]

> -----Original Message-----
> From: u-boot-users-admin at lists.sourceforge.net
> [mailto:u-boot-users-admin at lists.sourceforge.net] On Behalf
> Of Richard Klingler
> Sent: Monday, October 25, 2004 11:02 AM
> To: u-boot-users
> Subject: [U-Boot-Users] PPC as host
>
> Evening (o;
>
>
> Apparently no one uses Linux PPC as host?
> So no one ever had problems cross-compiling u-boot for
> another target then (o;
>
>
> In the top Makefile we have:
>
> ifndef CROSS_COMPILE
> ifeq ($(HOSTARCH),ppc)
> CROSS_COMPILE =
> else
> ....
>
> which always picks up the host ppc compiler regardless what
> ARCH you have defined for your board...
>
>
> Since I don't use PPC as target someone might come up with a
> better idea then:
>
> ifeq ($(HOSTARCH,$(ARCH))
> CROSS_COMPILE =
> else
> ...
>
>
> In my case it is YDL-3.0.1 PPC Linux running on G4.
> This doesn't happen on OSX since it is solved in the top
> config.mk file.
>
>
> best regards
> rick


The Makefile makes its best guess about cross compilers given very
limited information.  It may guess wrong, as you are seeing.

For more information, see:
  http://www.denx.de/twiki/bin/view/DULG/ELDKUsage

<blockquote>
    *  After the installation utility completes, export the
CROSS_COMPILE variable:

bash$ export CROSS_COMPILE=ppc_8xx-

      TIP The trailing '-' character in the CROSS_COMPILE variable value
is optional and has no effect on the cross tools behavior.
</blockquote>

A related hint (if you don't like the export hint) is in
  http://www.denx.de/twiki/bin/view/DULG/LinuxConfiguration

<blockquote>
If your host computer is not the same architecture as the target system,
and if you got your kernel tree from kernel.org or other "official"
sources, then you may have to supply an architecture override and a
cross compiler definition. The most reliable way to do this is to
specify them on the make command line as part of the make command. If
this is the case, use for example:

bash$ make ARCH=ppc CROSS_COMPILE=ppc_8xx-
</blockquote>

gvb

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[U-Boot-Users] PPC as host

[Richard Klingler]

> The Makefile makes its best guess about cross compilers given very
> limited information.  It may guess wrong, as you are seeing.

In this case it doesn't even 'guess' when cross-compiling for
example with target bfin-elf- (o;

> 
> For more information, see:
>   http://www.denx.de/twiki/bin/view/DULG/ELDKUsage
> 
> <blockquote>
>     *  After the installation utility completes, export the
> CROSS_COMPILE variable:
> 
> bash$ export CROSS_COMPILE=ppc_8xx-

I'm aware of CROSS_COMPILE though admit never read ELDK manuals
since I just don't do PPC development (o;


Just mentioned that there would be an easy fix for cross-compiling
for NON-PPC platforms...but if it's written by Wolfgang..so it should be
(o;


rick

[U-Boot-Users] PPC as host

[Wolfgang Denk]

In message <1098724833.1186.15.camel@imac> you wrote:
> 
> > The Makefile makes its best guess about cross compilers given very
> > limited information.  It may guess wrong, as you are seeing.
> 
> In this case it doesn't even 'guess' when cross-compiling for
> example with target bfin-elf- (o;

It doesn't guess because you can provide correct information  through
the  documented  ways. I think the make just does what you tell it to
do...

> I'm aware of CROSS_COMPILE though admit never read ELDK manuals
> since I just don't do PPC development (o;

First, the  quoted  document  (DULG)  is  more  than  just  the  ELDK
documentation.  It's  the  manual, and FAQ and some more about U-Boot
and Linux und the rest of the world. You are expected to read it ;-)

Second, the ELDK is more than just PPC, it also covers ARM and MIPS.

> Just mentioned that there would be an easy fix for cross-compiling
> for NON-PPC platforms...but if it's written by Wolfgang..so it should be
> (o;

Not only by me - many people contributed one way or another  (and  if
only by asking FAQ's ;-)

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
All I ask is a chance to prove that money can't make me happy.

[U-Boot-Users] PATCH: Introducing CONFIG_BOARD_PRE_RESET

[VanBaren, Gerald]

> -----Original Message-----
> From: Steven Scholz [mailto:steven.scholz at imc-berlin.de]
> Sent: Monday, October 25, 2004 10:40 AM
> To: VanBaren, Gerald (AGRE)
> Cc: u-boot-users
> Subject: Re: [U-Boot-Users] PATCH: Introducing CONFIG_BOARD_PRE_RESET
>
> Hi Gerald,
>
> > I like your suggestion a lot, but I would suggest a "#ifdef" around
> > the common.h kind of like I hand-pasted in below (probably
> > incorrectly, but you get my meaning).
>
> >  int board_postclk_init (void);
> >  int board_early_init_r (void);
> >  void board_poweroff (void);
> > +#ifdef CONFIG_BOARD_PRE_RESET
> > +void board_pre_reset (void);
> > +#endif
>
> Since functions like board_postclk_init and
> board_early_init_r etc. don't have an #ifdef I decided to go
> the same way.
>
> Do you see any problems without #ifdef ?
>
> --
> Steven Scholz

The reason I suggested the #ifdef is because the actual code
implementation is surrounded by the #ifdef so, if you don't have
CONFIG_BOARD_PRE_RESET defined, you will have a declaration of
board_pre_reset() but no code implementing it.  I forgot off-hand if
this is a problem, but I think it is (too lazy to be a language lawyer
at the moment).

gvb

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[U-Boot-Users] PPC as host

[Richard Klingler]

Evening (o;


Apparently no one uses Linux PPC as host?
So no one ever had problems cross-compiling u-boot
for another target then (o;


In the top Makefile we have:

ifndef CROSS_COMPILE
ifeq ($(HOSTARCH),ppc)
CROSS_COMPILE =
else
....

which always picks up the host ppc compiler regardless
what ARCH you have defined for your board...


Since I don't use PPC as target someone might come up
with a better idea then:

ifeq ($(HOSTARCH,$(ARCH))
CROSS_COMPILE =
else
...


In my case it is YDL-3.0.1 PPC Linux running on G4.
This doesn't happen on OSX since it is solved in the
top config.mk file.


best regards
rick

[U-Boot-Users] PPC as host

[Wolfgang Denk]

In message <1098716549.1186.7.camel@imac> you wrote:
> 
> Apparently no one uses Linux PPC as host?

Not many, but some are.

> So no one ever had problems cross-compiling u-boot
> for another target then (o;

Or the problems were solved.

> In the top Makefile we have:
> 
> ifndef CROSS_COMPILE
> ifeq ($(HOSTARCH),ppc)
> CROSS_COMPILE =
> else
> ....
> 
> which always picks up the host ppc compiler regardless
> what ARCH you have defined for your board...

Please note the "ifndef CROSS_COMPILE" - i.e. all you need to  do  is
provide  a  correct  setting  of  the  CROSS_COMPILE variable in your
environment resp. your make command line. I think  this  is  actually
documented somewhere.


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
I have often regretted my speech, never my silence.