[oe] EABI pain and frustration!

[Khem Raj]

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.

>
> Thanks,
>
> TAS
>
>
>
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