From: jacmet@sunsite•dk (Peter Korsgaard)
To: linux-arm-kernel@lists•infradead.org
Subject: AT91: Fix power-saving in idle-mode on 926T processors
Date: Mon, 10 Jan 2011 16:43:07 +0100 [thread overview]
Message-ID: <87fwt069ys.fsf@macbook.be.48ers.dk> (raw)
In-Reply-To: <1294673540l.26200l.0l@i-dmzi_al.realan.de> (Anders Larsen's message of "Mon, 10 Jan 2011 16:32:20 +0100")
>>>>> "Anders" == Anders Larsen <al@alarsen•net> writes:
Hi,
>> Is there a known interaction with this and the JTAG controller?
Anders> indeed there is - disabling the processor clock blocks JTAG debugging.
Ok - And apparently it completely blocks the JTAG controller, so you
cannot even put it in bypass mode and access other devices on the same
JTAG chain.
>> I haven't had time to look closer into it yet, but with this applied
>> I can no longer access an Altera FPGA on a chain shared with a 9G45
>> through Quartus.
Anders> If you boot with the kernel parameter "nohlt", arch_idle() is
Anders> not called, and JTAG should work again (but of course power
Anders> consumption will be substantially higher).
Anders> This was noted by Uwe Kleine-K?nig in
Anders> https://lkml.org/lkml/2010/5/5/342
Thanks.
--
Bye, Peter Korsgaard
next prev parent reply other threads:[~2011-01-10 15:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-07 19:44 AT91: Fix power-saving in idle-mode on 926T processors Anders Larsen
2010-10-08 12:29 ` Jean-Christophe PLAGNIOL-VILLARD
2010-10-08 13:51 ` Nicolas Ferre
2011-01-10 15:05 ` Peter Korsgaard
2011-01-10 15:32 ` Anders Larsen
2011-01-10 15:43 ` Peter Korsgaard [this message]
2011-01-10 19:23 ` Uwe Kleine-König
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