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TheLazy1
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PostPosted: Mon Jul 02, 2007 1:58 am    Post subject: Issues with PM 7500 G4/450 upgrade Reply with quote

I have this crazy idea to put my old PowerMac to use as a $0 PVR box using gentoo.
The problem is that while gentoo boots, it is extremely slow.

/proc/cpuinfo Shows the CPU at 195MHz and there is no mention of any L2 cache.
Oddly enough it also shows the BogoMips at only 24 which is very weird.

I made sure the sonnet G4 extension is loaded before running BootX but I have no idea what to do now.

Full specs:

Power Macintosh 7500/100
Sonnet PCI G4 450/1M CPU Upgrade
ATI Radeon Mac Edition 32MB PCI
Sonnet Tempo ATA/66 PCI
PCI USB 2.0 Adapter
9.1GB SCSI Hard drive
6GB IDE Hard drive

If I get this working but the machine is too slow to encode MPEG-2 fast enough, would a TV tuner with
a hardware MPEG encoder work in this machine?
The Hauppauge WinTV PVR-150 can be found cheap around here and apparently works under linux, but I'd like
to use the built-in A/V ports if possible to keep this project completely free.
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JoseJX
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PostPosted: Mon Jul 02, 2007 5:05 pm    Post subject: Reply with quote

As far as I know, the rear AV ports are no longer supported (there was a driver in 2.4, but it's been dropped since nobody maintained it). Even then, I don't remember it having very good quality. That said, for the L2, did you ensure that the L2 was enabled using the cache tool that comes with BootX? Does the CPU speed show up correctly in dmesg? Does this CPU upgrade allow for frequency changes?
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TheLazy1
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PostPosted: Mon Jul 02, 2007 5:49 pm    Post subject: Reply with quote

Oh, I had no idea that the AV ports aren't supported under 2.6.
I guess I could either port it over to 2.6 or just buy a WinTV PVR card.

The cache tool that comes with BootX does not work, it says my cpu is not a G3 then does nothing.
I don't know about CPU frequency changing, but dmesg does not mention the CPU speed. It's mainly saying in "from bad port".
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JoseJX
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PostPosted: Mon Jul 02, 2007 10:27 pm    Post subject: Reply with quote

http://www.gentoo.org/doc/en/gentoo-ppc-faq.xml#infrombadport <- Try this to get rid of the "In from bad port" messages.
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TheLazy1
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PostPosted: Tue Jul 03, 2007 1:13 am    Post subject: Reply with quote

I actually should have mentioned that I am trying to boot the minimal installation CD, sorry for leaving that out.
No matter what I do BootX will not enable the G3 cache option, I got the L2CR value from the PowerLogix cache profiler and added the resource in the BootX preferences but the tickbox is always disabled.

I'm also starting to wonder if that machine could even play MPEG-2 video, but I can't find out until the CPU shows full speed and the
L2 is enabled.
Maybe I need an older kernel?
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JoseJX
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PostPosted: Tue Jul 03, 2007 3:40 pm    Post subject: Reply with quote

Okay, I did some poking around. It looks like you need to use the GrabL2CacheSetting from XPostFacto (here) to get the L2 Cache settings. After this, use ResEdit to force the L2 cache setting to be applied with the value you found from GrabL2CacheSetting. I'm still not sure about the reported CPU speed.

Also, the BogoMIPS value is correct, PPC doesn't use it in the same way as other arches.
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