[oe] EABI pain and frustration!

[pspreadborough at comcast.net]

----- "Travis Stratman" <tstratman at emacinc.com> wrote: 
> On Fri, 2010-02-05 at 13:41 -0800, Khem Raj wrote: 
> > On Fri, Feb 5, 2010 at 12:43 PM, Travis Stratman <tstratman at emacinc.com> wrote: 
> > > On Fri, 2010-02-05 at 10:00 -0800, Khem Raj wrote: 
> > >> On Fri, Feb 5, 2010 at 4:29 AM, Detlef Vollmann <dv at vollmann.ch> wrote: 
> > >> > On 02/03/10 15:03, pspreadborough at comcast.net wrote: 
> > >> >> 
> > >> >> My 2.6.29 kernel is built with the CodeSourcery 
> > >> >> arm-2009q3-67-arm-none-linux-gnueabi compiler and has the EABI and 
> > >> >> OABI_COMPAT config options enabled. Using this kernel I can boot my SA1110 
> > >> >> iPaq into a OABI ramfs with no problems, however if I build a "HelloWorld" 
> > >> >> executable with the same compiler and try and run it I get an "Illegal 
> > >> >> Instruction" error. I build the test program using static linking, select 
> > >> >> the correct machine type and tune options but to no avail, I always get the 
> > >> >> illegal instruction. 
> > >> 
> > >> You need gcc 4.4 to get EABI working on ARMv4 and there are additional patches 
> > >> to gcc on top of gcc 4.4 see 
> > >> gcc-armv4-pass-fix-v4bx-to-ld.patch for gcc in OE. So as Koen suggested earlier 
> > >> if you try with OE compiler you might have better chance of getting it 
> > >> to work as many 
> > >> OE devs have tried it. 
> > >> btw. are you passing march=armv4 to the compiler when doing the compile ? 
> > > 
> > > >From my understanding of this issue he has an OABI rootfs and is trying 
> > > to run an EABI executable on top of it. This just doesn't work period 
> > > AFAIK; the kernel can boot either OABI or EABI with the compatibility 
> > > flags config'd in, but all of the binaries on the filesystem must match. 
> > > 
> > > I'll have to look into the patch that you referenced above because I 
> > > have been using EABI (built through OE) for both the kernel and 
> > > filesystem with armv4t for a few years now. First w/ GCC 4.1.1 and now 
> > > with 4.2.4 and I've never run into issues. Does the issue only manifest 
> > > in certain situations? 
> > 
> > Well you said armv4t thats a whole different story than armv4 (without 
> > 't') for EABI 
> > AFAICT SA1110 is based on ARMv4 not ARMv4t. 
> 
> You are correct, my mistake. 

I have built a EABI rootfs but I get a kernel panic when it attempts
to run init, hence my attempts to verify my EABI executables on a OABI 
fs.

Perhaps it's time for me to try the OE EABI compiler. Can you advise me 
on which OE recipes to use for this?

Regards,

Pete