Kernel Panic on DREAMPLUG: Alignment Fault 1

[Ian Lepore]

On Thu, 2013-08-01 at 18:13 +0200, Mattia Rossi wrote:
> On 01/08/13 15:28, Ian Lepore wrote:
> > On Thu, 2013-08-01 at 10:32 +0200, Mattia Rossi wrote:
> >> <snip>
> >>
> >> Anyhow, I'll try to compile with gcc, and see what happens.
> > The host system's compiler (gcc in your case) is used to build the
> > selected compiler from src/, then that new compiler is used to build the
> > rest of src/ into a runnable system.  You can define WITHOUT_CLANG_IS_CC
> > and WITHOUT_EABI to use gcc, and you should probably add WITHOUT_CLANG
> > to avoid building it since it won't be used (and it takes forever to
> > build).
> Kernel built with gcc:
> [snip... same fault as with clang]

Yep, I just had the same experience -- same fault, same place, addresses
differ by a few bytes which is to be expected with a different compiler.

I've just confirmed that gcc and WITHOUT_ARM_EABI=yes works fine, so the
problem seems to be that we're somehow not maintaining stack alignment
correctly for EABI on architectures prior to armv6.  I have a feeling
somewhere in the code is something conditional on ARMV6 that really
needs to include armv5te (which has the ldrd/strd instructions).

-- Ian