Digi CCWMX53

[John-Mark Gurney]

Russell Haley wrote this message on Mon, Sep 29, 2014 at 20:14 -0700:
> Tim,
> 
> > FreeBSD source has an 'xdev' target that builds and installs a set of
> cross-tools.  In particular, it can install cross-versions of the same GCC
> or clang used by the rest of FreeBSD.
> 
> Where can I find more information on cross compiling on FreeBSD?

check out:
https://wiki.freebsd.org/A_Brief_Guide_To_Cross_Compiling_FreeBSD

Though MAKEOBJDIRPREFIX isn't required, and neither is TARGET...

now using an external tool chain is a different topic..

> On Sat, Sep 27, 2014 at 11:53 AM, Tim Kientzle <tim at kientzle.com> wrote:
> 
> >
> > On Sep 26, 2014, at 10:38 PM, Russell Haley <russ.haley at gmail.com> wrote:
> >
> > > 1) Can anyone give me the correct u-boot enviroment variables or
> > reference
> > > to the u-boot process to boot the completed freebsd kernel. Specifically
> > on
> > > a CCWMX53 if possible, but I have linux references to port from. Where
> > > would I look for an example?
> >
> > There are two general approaches being used:
> >
> > 1) Have U-Boot load and boot the kernel directly.  This can sometimes be
> > done with an unmodified Linux U-Boot.
> >
> > 2) Have U-Boot load FreeBSDs scriptable 'ubldr' and have that load the
> > kernel.  This provides more flexibility in the boot process but usually
> > requires rebuilding U-Boot.  In particular, you'll need to:
> >    * Add CONFIG_CMD_ELF option to U-Boot so it can load `ubldr' which is
> > an ELF executable
> >    * Add CONFIG_CMD_API option to U-Boot so `ubldr' can access U-Boot's
> > drivers for hardware access (`ubldr' itself has to be compiled for each
> > board to adjust the load address but is otherwise completely generic).
> >    * Adjust the U-Boot startup scripts to set FDT environment variables
> > and load ubldr.  You can look at the U-Boot patches for various boards
> > supported by Crochet to see how this has been done elsewhere:
> >    github.com/kientlze/crochet-freebsd
> >
> >
> > > 2) Do I need to create a cross compiler? Reference 1 says yes, reference
> > > two says no. Help!
> >
> > In most cases, the FreeBSD build system will build a cross-compiler for
> > it's own use, so you generally don't need to install a cross compiler to
> > cross-build FreeBSD proper.  However, U-Boot is not part of FreeBSD so you
> > may need to install a separate cross-compiler to build that.
> >
> > >
> > > Ref.1 Build  a cross compiler
> > > https://wiki.freebsd.org/FreeBSD/arm/ArndaleBoard
> >
> > This is using a cross-compiler from ports to build U-Boot.  It uses the
> > FreeBSD build machinery to cross-build the FreeBSD kernel and world.  (When
> > you specify TARGET_ARCH, FreeBSD's 'buildworld' target will build and use a
> > suitable cross-compiler.  Also, 'buildkernel' will reuse the cross-compiler
> > built by 'buildworld', so you do not need 'kernel-toolchain' as long as you
> > 'buildworld' first.)
> >
> > >
> > > Ref 2. No cross compiler/ make toolchain
> > > https://wiki.freebsd.org/A_Brief_Guide_To_Cross_Compiling_FreeBSD
> >
> > This example only talks about building *world*, and the 'buildworld'
> > target builds the necessary cross-tools transparently.  In particular,
> > since it doesn't talk about building out-of-tree boot loaders such as
> > U-Boot, it does not need to talk about building/installing an explicit
> > cross-compiler.
> >
> > For cross-compilers, you have three options:
> >  * Ports.
> >  * After a successful buildworld, you can 'make TARGET=xyz ... buildenv'
> > to get a shell with suitable path settings to reuse the cross-tools from
> > the buildworld stage.  Use 'buildenvvar' to just get the environment for
> > use in scripts.
> >  * FreeBSD source has an 'xdev' target that builds and installs a set of
> > cross-tools.  In particular, it can install cross-versions of the same GCC
> > or clang used by the rest of FreeBSD.  This facility has changed a lot
> > recently, so ask if you need the current command line.
> >
> > Hope this clarifies things,
> >
> > Tim
> >
> >
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-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."