[ptxdist] Booting kernel crashes when using OSELAS.Toolchain-2014.12.1 for ARMv5TE

[Stranz Jan-Marc <JM.Stranz@gantner-instruments.com>]

Hi Juergen,

thank you for the hints.
Searching for an useful answer by Google isn't so easy, you'll get a lot of comments and I haven't  the experience as a kernel developer has; I'm only a "user" of the components and tools.

Now a I've got a hint to that the implementation of "memset" (/arch/arm/lib/memset.S) maybe the problem (https://bugs.linaro.org/show_bug.cgi?id=928#c7).

I would try to compile the Linux kernel with an additional option "-fno-builtin-memset".
How can I do that?
PTXdist provides a rule "kernel.make".
How should I modify this rule in order to activate the additional option "-fno-builtin-memset"?

Best regards
Jan-Marc.



-----Ursprüngliche Nachricht-----
Von: Juergen Borleis [mailto:jbe@pengutronix.de] 
Gesendet: Dienstag, 25. August 2015 16:01
An: ptxdist@pengutronix.de
Cc: Stranz Jan-Marc <JM.Stranz@gantner-instruments.com>
Betreff: Re: [ptxdist] Booting kernel crashes when using OSELAS.Toolchain-2014.12.1 for ARMv5TE

Hi Jan-Marc,

On Tuesday 25 August 2015 15:37:48 Stranz Jan-Marc wrote:
> thank you for the hint.
>
> But I need some help: where can I check if there any known issues with 
> specific gcc versions and specific Linux kernel versions.

By using Google?

> Concrete: I'm using Linux kernel 3.3.0 (with some hardware specific
> adaptions) and the OSELAS.Toolchain-2014.12.1 provides gcc 4.9.2.

First of all you should check with a minimal recent Linux-4.2-rc kernel if it boots at all when it was built with a GCC-4.9.2. Then you could use "git bisect" to find the reason and/or the required patch.

Regards,
Juergen

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Pengutronix e.K.                              | Juergen Borleis             | Industrial Linux Solutions                    | http://www.pengutronix.de/  |
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