From: Stefan Roese <stefan.roese@gmail.com>
To: linux-omap <linux-omap@vger.kernel.org>
Cc: Tony Lindgren <tony@atomide.com>
Subject: AM335x board with disabled RTC crashes
Date: Wed, 20 Nov 2013 15:18:51 +0100 [thread overview]
Message-ID: <528CC4CB.4000609@gmail.com> (raw)
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?
Thanks,
Stefan
next reply other threads:[~2013-11-20 14:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-20 14:18 Stefan Roese [this message]
2013-11-20 14:22 ` AM335x board with disabled RTC crashes Nishanth Menon
[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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