[PATCH] Add cross compile dependecy info for ARMv7

[Peter Polgar]

Hi Heinrich,

Sorry for the late reply, other things were going on so I dropped my U-boot
project for a while.

What you have written totally makes sense. I wasn't aware what the "hf"
stands for in the package name.
Just saw that my architecture was "armhf", so I assumed I needed the
build essentials for that. Which I guess would have been the case if the
project used floating point.

I will update my commit.

Best regards,
Peter

On Wed, 4 Dec 2024 at 10:34, Heinrich Schuchardt <
heinrich.schuchardt at canonical.com> wrote:

> On 28.11.24 17:48, Peter Polgar wrote:
> > This commit adds info about the needed package to cross compile
> > U-Boot to ARMv7 (32 bit) architecture on Debian based distros.
> > ---
> >   doc/build/gcc.rst | 12 ++++++++++++
> >   1 file changed, 12 insertions(+)
> >
> > diff --git a/doc/build/gcc.rst b/doc/build/gcc.rst
> > index d8fcfdc4bf..c552e7b590 100644
> > --- a/doc/build/gcc.rst
> > +++ b/doc/build/gcc.rst
> > @@ -19,6 +19,12 @@ You could install GCC and the GCC cross compiler
> > for the ARMv8 architecture with
> >
> >       sudo apt-get install gcc gcc-aarch64-linux-gnu
> >Tota
> > +For the ARMv7 architecture (32 bit)  use the below command instead
> > +
> > +.. code-block:: bash
> > +
> > +    sudo apt-get install gcc crossbuild-essential-armhf
>
> crossbuild-essential-armhf depends on
> gcc-arm-linux-gnueabihf gcc:armhf, g++-arm-linux-gnueabihf, g++:armhf,
> dpkg-cross
>
> But gcc-arm-linux-gnueabi is all you need for cross-compiling 32-bit ARM
> U-Boot.
>
> Adding an example for every architecture seems too much to me.
>
> Can't we simply update this sentence pointing out the the arm
> cross-compiler has a suffix.
>
> "On Debian based systems the cross compiler packages are named
> gcc-<architecture>-linux-gnu".
>
> E.g. add
>
> "gcc-arm-linux-gnueabi is the 32-bit ARM cross-compiler package."
>
> > +
> >   Depending on the build targets further packages maybe needed
> >
> >   .. code-block:: bash
> > @@ -118,6 +124,12 @@ Assuming cross compiling on Debian for ARMv8 this
> would be
> >
> >       CROSS_COMPILE=aarch64-linux-gnu- make
> >
> > +Also on Debian but for ARMv7 it would be
> > +
> > +.. code-block:: bash
> > +
> > +    CROSS_COMPILE=arm-linux-gnueabihf- make
>
> U-Boot supports  ARM SoCs prior to ARMv7. U-Boot doesn't use floating
> point. So arm-linux-gnueabi is the right choice for all 32-bit ARM boards.
>
> Best regards
>
> Heinrich
>
> > +
> >   Out-of-tree building
> >   ~~~~~~~~~~~~~~~~~~~~
> >
>
>