Date: Wed, 3 Oct 2012 10:33:55 +0200 From: Matthew Rezny <mrezny@hexaneinc.com> To: Andreas Tobler <andreast-list@fgznet.ch> Cc: Justin Hibbits <chmeeedalf@gmail.com>, freebsd-ppc@freebsd.org Subject: Re: FreeBSD9 running CPUs slow on PowerMac7,2 Message-ID: <B76D891F-71F7-4F4F-BD21-BF1302FEE1F2@hexaneinc.com> In-Reply-To: <506BBE8C.5090404@fgznet.ch> References: <823A5C42-D1B8-49BF-BDB8-F551167AC6C0@hexaneinc.com> <20121002224117.339ac8b1@narn.knownspace> <506BBE8C.5090404@fgznet.ch>
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Thank you very much Justin and Andreas! That would explains the problem, = and I just tested to confirm the system boots full speed when not = stopping at the OF prompt. Good to have this solved, though I hope to be = able to better solve it. When I was trying 8.x previous, the boot from CD with C worked. Once I = had an installed system, I could choose that disk as the startup disk in = OS X and reboot to FreeBSD temporarily. When I tried to boot the 9.0 CD, = something was read from the disk but then then half the colors go = inverse while it keeps flashing the missing boot folder icon. So, to get = the CD booted I had to do so from the OF prompt. I had left it stopping = at the prompt for now due to the difficulty in even getting to this = point. I don't have a Mac keyboard, nor do I have anything with a "Windows" key = to plug into it, so armed with a stack of true 101 key keyboard, I can't = invoke any boot time option that needs the cmd/apple key. This machine = also has the issue that the boot selector accessed by holding alt/option = simply does not work, never has since it was new. So, to get to an OF = prompt, I had to boot a OS X install DVD, bring up Terminal and use = nvram tool to set auto-boot?=3Dfalse. I was reluctant to change that = back since it took such effort to set it in the first place, but in = retrospect I guess I could have saved many hours of trying other things = had I even thought to change that. Is there any way to change OD = variable from FreeBSD as can be done under OS X with nvram command? That = would make it easier to get the prompt back when needed as long as the = system is still booting. Now I'm running at full speed, 2000.20Mhz according to dmesg. It also = seems my guess at the source of the issue is probably right, the loader = gets something screwed up before the kernel even starts and then the = kernel is helpless to fix it. The loader behaves different depending how = it's invoked, and that seems like a bug worth fixing. Unfortunately, I = know little about the loader and feel unprepared to tackle it since I = have only one machine such machine and thus no easy way to debug things = running from OpenFirmware. I had already looked at the loader code with = an eye to get ZFS booting and decided I'm not ready to tackle it yet. Having proper support in cpufreq for the SMU-less G5s would be = beneficial in that it would allow power control as well as give a way to = resolve this for cases where booting from the OF prompt may be = necessary. Also, I have enough experience on other platforms with GPIO = and I2C to feel confident messing with such things on this machine. I = noticed there is an assortment of GPIOs with no driver attached, and = numerous I2C devices also without drivers attached. I already made a = list of the chips on the I2C bus with the intent to look them up later. = The individual GPIO looks uninteresting for this going by the names = Apple uses. I think everything interesting is sitting on I2C. All the = monitoring chips are now supported, DS1775 and MAX6690 for temperature, = AD7417 for voltage and current. That leaves a few other chips to look at = and the labels Apple seems to confirm their purpose. There are two = called i2c-hwclock, cy2213 "High Frequency Programmable PECL Clock = Generator" and cy28508 "Power PC System Clock", which I suspect are = controlling both CPU and bus clocks. There is a pair of pca9556s labeled = i2c-cpu-voltage, which are basically GPIO expanders and I suspect are = controlling CPU voltage, one per chip. There are also a pair of serial = EEPROMs, labeled cpuid, which I think are on each CPU board and just = contain the parameters to identify the chip to the motherboard. There's = one more device labeled 'cereal' but I couldn't find a part number for = the chip. Is anyone working on these? On 3 Oct, 2012, at 6:26, Andreas Tobler wrote: > On 03.10.12 04:41, Justin Hibbits wrote: >> On Wed, 3 Oct 2012 01:17:08 +0200 >> Matthew Rezny <mrezny@hexaneinc.com> wrote: >>=20 >>> Tue Oct 2 22:49:53 UTC 2012 Jason bacon wrote: >>>> Did you try enabling powerd? ( powerd_enable=3D"YES" in rc.conf, >>>> "man powerd" ) >>>>=20 >>>> I had this issue with an iBook some time ago, and Nathan W. pointed >>>> out that Macs boot at the lower CPU freq, so you have to change it >>>> manually with sysctl or run powerd to control it automatically. >>>=20 >>> I do have that in rc.conf, but powerd has no way to control the >>> clockrate without cpufreq available. >>>=20 >>> # powerd >>> powerd: lookup freq: No such file or directory >>>=20 >>> _______________________________________________ >>> freebsd-ppc@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-ppc >>> To unsubscribe, send any mail to = "freebsd-ppc-unsubscribe@freebsd.org" >>=20 >> Andreas Tobler posted something related to this a while back on the >> list. His suggestion at the time was to autoboot to FreeBSD, and not >> boot via the Open Firmware prompt. If you're already doing that, I'm >> clueless. >>=20 >> The relevant link I found is >> = http://freebsd.1045724.n5.nabble.com/Fan-Power-controls-td4170991.html >=20 > Justin is right here. The only option you have is autoboot to get the = full CPU frequency. > These machines have a complicated way to setup the full CPU frequency = and I do not know if it is worth hacking here when one can get the value = with autobooting. >=20 > Here in the last section 'Booting into FreeBSD' you find how to do = this. >=20 > http://people.freebsd.org/~nwhitehorn/ppcinstall.txt >=20 > Hope this helps. > Andreas >=20
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