i.MX35 Kernel without ARM EABI support cannot execute init

[Robert Schwebel]

Marco,

On Fri, Aug 21, 2009 at 04:37:15PM +0200, hoefle marco wrote:
> right now we have two ARM boards and two embedded linux distributions
> (Emdebian and OSELAS). The CPUs are PXA270 and Freescale i.MX35. The
> aim is to have emdebian on both boards.

Why? :-)

> When trying to boot the i.MX35 Kernel (with ARM EABI or without, the
> kernel panic remains exactly the same) using the emdebian rootfs I get
> this:
>
> Kernel panic - not syncing: Attempted to kill init!
> Backtrace:
> [<c0026430>] (dump_backtrace+0x0/0x10c) from [<c02515dc>] (dump_stack
> +0x18/0x1c)
>  r7:c7817f54 r6:c7813c40 r5:c7813c40 r4:00000004
> [<c02515c4>] (dump_stack+0x0/0x1c) from [<c025161c>] (panic+0x3c/0x110)
> [<c02515e0>] (panic+0x0/0x110) from [<c0034a14>] (do_exit+0x6c/0x5b8)
>  r3:c0301bd4 r2:c7813c40 r1:c7817d14 r0:c02b478a
> [<c00349a8>] (do_exit+0x0/0x5b8) from [<c0034fe0>] (do_group_exit
> +0x80/0xb4)
> [<c0034f60>] (do_group_exit+0x0/0xb4) from [<c003ea60>]
> (get_signal_to_deliver+0x2c0/0x2f0)
>  r4:00000004
> [<c003e7a0>] (get_signal_to_deliver+0x0/0x2f0) from [<c0024ecc>]
> (do_signal+0x58/0x4e4)
> [<c0024e74>] (do_signal+0x0/0x4e4) from [<c0025384>] (do_notify_resume
> +0x2c/0x30)
> [<c0025358>] (do_notify_resume+0x0/0x30) from [<c0022dac>] (work_pending
> +0x1c/0x20)
>
> The PXA270 kernel (same settings except ARM system type and ARM EABI
> disabled) boots the emdebian root file-system successfully.
>
> The i.MX35 Kernel boots with ARM EABI support the OSELAS file-system.
> Both Kernels are version 2.6.30.4 and were compiled with the same
> arm-linux-gnu-gcc compiler.
>
> >From my understanding it should be possible to use the same root
> file-system on both CPUs.
>
> Has anybody an idea why this is not working?

Are you sure your toolchains generate the right code for your CPUs? If
you want to have root fs for both, PXA270 and i.MX35, you probably need
an ARMv4 Toolchain. Unfortunately, your "arm-linux-gnu-gcc" compiler
name doesn't suggest anything about what code this compiler generates.

If you use the OSELAS.BSP from Phytec which was made for the i.MX35, it
was probably made with an ARM1136EJ-S compiler and builds optimized code
for that CPU.

However, within PTXdist / OSELAS.BSP one can build either specialized
platforms for each of the CPUs (which basically means that you get a
separate set of ipkg archives for each cpu) or use a "least common"
v4t toolchain.

rsc
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