Re: crosstool-ng: cross compiler for -mach=arm4vt (Cirrus Logic EP93xx target)

["H Hartley Sweeten" <hartleys at visionengravers dot com>]

Hello Yann,

I did not get a CC on your reply but saw it in the mail archive.  Hopefully
this gets threaded correctly...

> On Tuesday 08 September 2009 22:42:24 H Hartley Sweeten wrote:
>> I have been trying to get CodeSourcery's arm-none-linux-gnueabi (Sourcery
>> G++ Lite 2009q1-203) 4.3.3 toolchain to work with Buildroot and an EP93xx
>> based target. ÂUnfortunately Buildroot is not setup to handle the multilib
>> feature of that toolchain (default libraries are for ARMv5T). ÂI have
>> tried a number of ways in Buildroot to get that that toolchain to work but
>> my resulting filesystem always dies due to an unrecognized instruction.
>
> If we can trust the Linux kernel, then the EP93xx is an arm920t, which
> is an armv4, not an armv5t. Which can explain why you have an illegal
> instruction...

The Linux kernel was getting compiled correctly with the CodeSourcery
toolchain so we can probably trust it.  I have been using that toolchain
for a number of months to build my kernel.  I only ran into a problem with
Buildroot when I tried rebuilding my filesystem a couple of weeks ago.

I have manually compiled a static test "init" program for my filesystem and
it ran without issues.  I think the only problem with the CodeSourcery
toolchain is that Buildroot does not understand how to handle the multilib
aspect of it.

I'm hoping that a sysroot toolchain that only supports "my" architecture
will work better with Buildroot.

>> I followed the Download and usage instructions on the website:
> [--SNIP install steps--]
>
> Correct. :-)

Well at least I did that right. ;-)

>> I think I have everything setup and configured correctly but I can't figure
>> out why the build is failing.  From the build.log it appears that linuxthreads
>> is getting checked out but when the build tries to mv it the files do not exist:
>> [ALL  ]    cvs checkout: Updating linuxthreads/linuxthreads_db
>> [DEBUG]    ==> Executing: 'mv linuxthreads glibc-linuxthreads-cvs-2.7'
>> [ALL  ]    mv: cannot stat `linuxthreads': No such file or directory
>> [ERROR]    Build failed in step 'Retrieving needed toolchain components' tarballs'
>
> I don't download everything every time, so it may well be that something
> broke at some point. Care to send your .config, so I can try to reproduce?

I tried executing the command line that fails from the build.log directly.

bigguiness@etch:~/src/tmp$ cvs -z 9 -d :pserver:anoncvs@sources.redhat.com:/cvs/glibc co -P -r glibc-2_6-branch linuxthreads
cvs checkout: CVS password file /home/bigguiness/.cvspass does not exist - creating a new file
cvs checkout: Updating linuxthreads
[--SNIP more cvs checkout lines--]
cvs checkout: Updating linuxthreads/linuxthreads_db
bigguiness@etch:~/src/tmp$ ls
bigguiness@etch:~/src/tmp$

It appears that the checkout is not working correctly.

My .config follows at the end of this message.

>> Do I have something configured incorrectly or am I doing something wrong?
>> Is there a "magic" combination of the Binutils/C compiler/C-library version
>> that must be used?
>
> There's no armv4t sample in crosstool-NG.
> But you could base your configuration on the arm-unknown-linux-uclibc
> sample, and update the configuration to something like:
>   Target options -->
>     (armv4t) Architecture level
>     ()  Generate code for the specific ABI
>     (ep9312) Emit assembly for CPU
>     (ep9312) Tune for CPU
>     (maverick) Use specific FPU
>     Floating point: ---> hardware (FPU)
> 
> NB: do not enable EABI, I think it requires at least armv5t, but I'm
>     not sure. So stay on the safe side, and stick with OABI.

I set those options.  I used arm920t instead of ep9312 but I believe
ep9312 is just an alias.

BTW, EABI does work on the armv4t.  My kernel is compiled with it and
works with no problems.

> I give no guarantee, as I don't have the HW, but you should give it a
> try. Also, java is currently broken, so you should disable it in the
> "C compiler" sub-menu...

I don't need java so that's not a problem.  I already have it disabled in
The options.

Thanks,
Hartley

---

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