From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 16 Oct 2002 09:22:08 -0400 From: Patrick Mahoney To: Cameron Rich Cc: "'Conn Clark'" , Patrick Mahoney , May Ling List Subject: Re: mpc8xx - power save modes - PIT Message-ID: <20021016132208.GA16734@segfault.usine.8d.com> References: <1072F1A27E99D3119747005004B9A380016F9573@MAIL> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1072F1A27E99D3119747005004B9A380016F9573@MAIL> Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: > I've tried Conn's code, but I'm experiencing problems with PLPRCR[CSCR] as > being 1 all the time after a rfi. I am also occasionally seeing MSR_POW set > to 1 after the rfi return. Well the 2.4 Linux kernel does not support runtime modifications to the clock rate. So what's the point of playing with CSCR? > > I can work around this problem by setting PLPRCR[CSCR] = 0 and MSR_POW = 0 > after the rfi and this eventually works. But is this the solution? I'm also > noticing no great decrease in power consumption even though I've only got a > couple of (sleeping) processes. And it seems that there is (mostly) no time > between entering Doze Low mode and the rfi which confirms the unsatisfactory > power consumption figures. I notice no decrease at all! :( I set both crqen and prqen in the bootloader. The idled routine gets entered and executed repeatedly, but no decrease in current consumption can be observed. Pat Mahoney ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/