From mboxrd@z Thu Jan 1 00:00:00 1970 From: jacmet@sunsite.dk (Peter Korsgaard) Date: Mon, 10 Jan 2011 16:43:07 +0100 Subject: AT91: Fix power-saving in idle-mode on 926T processors In-Reply-To: <1294673540l.26200l.0l@i-dmzi_al.realan.de> (Anders Larsen's message of "Mon, 10 Jan 2011 16:32:20 +0100") References: <1294673540l.26200l.0l@i-dmzi_al.realan.de> Message-ID: <87fwt069ys.fsf@macbook.be.48ers.dk> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org >>>>> "Anders" == Anders Larsen 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