From: Nishanth Menon <nm@ti.com>
To: Stefan Roese <stefan.roese@gmail.com>,
linux-omap <linux-omap@vger.kernel.org>
Cc: Tony Lindgren <tony@atomide.com>
Subject: Re: AM335x board with disabled RTC crashes
Date: Wed, 20 Nov 2013 08:22:59 -0600 [thread overview]
Message-ID: <528CC5C3.2010905@ti.com> (raw)
In-Reply-To: <528CC4CB.4000609@gmail.com>
On 11/20/2013 08:18 AM, Stefan Roese wrote:
> Hi!
>
> I'm currently working on a custom AM335x based board, where the SoC
> RTC is disabled. As described in this page in the "RTC feature disabled"
> column:
>
> http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist#RTC
>
> On this board the registers of the RTC are not accessible. But the OMAP
> hwmod code tries to read the sysc register unconditionally from the RTC.
> And this leads to this crash (using v3.12):
>
> ...
> [ 0.179491] CPU: Testing write buffer coherency: ok
> [ 0.187702] Setting up static identity map for 0xc04dfa90 - 0xc04dfb00
> [ 0.204665] devtmpfs: initialized
> [ 0.219513] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
> [ 0.237462] *** _update_sysc_cache (263): name=emif
> [ 0.246247] omap_hwmod: debugss: _wait_target_disable failed
> [ 0.252290] *** _update_sysc_cache (263): name=uart1
> [ 0.257668] *** _update_sysc_cache (263): name=rtc
> [ 0.262885] Unhandled fault: external abort on non-linefetch (0x1028) at 0xf9e3e078
> [ 0.270893] Internal error: : 1028 [#1] ARM
> [ 0.275302] Modules linked in:
> [ 0.278572] CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0-dirty #21
> [ 0.285222] task: c7047340 ti: c7048000 task.ti: c7048000
> [ 0.290909] PC is at _update_sysc_cache+0x44/0xb0
> [ 0.295861] LR is at _update_sysc_cache+0x1c/0xb0
> ...
>
> Disabling the RTC in the DT doesn't help (of course). So what's the
> recommended way to disable this hwmod access to the RTC registers?
http://www.spinics.net/lists/linux-omap/msg98207.html
might help you - we had thought it might get queued for 3.12, but it
was queued for 3.13 instead..
--
Regards,
Nishanth Menon
next prev parent reply other threads:[~2013-11-20 14:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-20 14:18 AM335x board with disabled RTC crashes Stefan Roese
2013-11-20 14:22 ` Nishanth Menon [this message]
[not found] ` <528CDAF6.7070905@ti.com>
2013-11-21 4:28 ` Stefan Roese
2013-11-21 4:32 ` Stefan Roese
2013-11-21 5:30 ` Nishanth Menon
2013-11-21 5:42 ` Stefan Roese
2013-11-21 5:52 ` Nishanth Menon
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