From: Hubert Chaumette <hubert.chaumette@wanadoo.fr>
To: Ivan Stoyanov <ivan.stoyanov@amk-drives.bg>,
linux-newbie@vger.kernel.org
Subject: re: i.mx35 kernel freeze on booting
Date: Fri, 16 Dec 2016 09:22:34 +0100 (CET) [thread overview]
Message-ID: <2082465329.2118.1481876554448.JavaMail.www@wwinf1p17> (raw)
In-Reply-To: <ea833817-14cf-4db2-bd68-15bae3aa79a3@amk-drives.bg>
> Message du 15/12/16 16:43
> De : "Ivan Stoyanov"
> Hello group,
>
> I am working on i.mx35 based board and I have found a problem with mx3fb
> driver. On boot kernel freeze during mx3fb driver initialization and
> reboot after few seconds. I tried to debug with prints and found that
> kernel freeze as soon as writing SDC_COM_BG_EN in SDC_COM_CONF register.
>
> Could you please give me advice how get more debug information?
Hi,
A few thoughts:
- compile the driver as module to make it to userspace before testing, you could then use ftrace and dynamic printk rather than recompilation (or only rebuild the module);
- check your platform data (device tree?) for wrong addresses;
- faulty hardware?
- activate locking debug in your kernel
- check for interrupt storm on enabling the channel (last comment in http://lxr.free-electrons.com/source/drivers/video/fbdev/mx3fb.c#L389)
Regards,
Hubert
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prev parent reply other threads:[~2016-12-16 8:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-15 15:35 i.mx35 kernel freeze on booting Ivan Stoyanov
2016-12-16 8:22 ` Hubert Chaumette [this message]
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