From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: John Steele Scott <toojays@toojays.net>
Cc: linuxppc-dev list <linuxppc-dev@lists.linuxppc.org>,
Christiaan Welvaart <cjw@daneel.dyndns.org>
Subject: Re: nearly-working support for cpufreq on 2004 iBook G4 with 7447A cpu
Date: Tue, 01 Jun 2004 09:41:00 +1000 [thread overview]
Message-ID: <1086046859.9638.70.camel@gaston> (raw)
In-Reply-To: <200405311807.59356.toojays@toojays.net>
On Mon, 2004-05-31 at 18:37, John Steele Scott wrote:
>
> On Mon, 31 May 2004 01:19 pm, Benjamin Herrenschmidt wrote:
> > Ok, that's weird, I don't see the same kind of clock chip on i2c as
> > the previous model had... Can you check the exact dividers programmed
> > on the CPU and redo the calculation based on the bus frequency ?
>
> Okay.
>
> At boot: HID1=80414c80 => PLL_CFG=10100, i.e. 4:1 core multiplier
>
> After clearing DFS, HID1=80018c80 => PLL_CFG=11000, i.e. 8:1 core multiplier
>
> I decoded the PLL values using the table on page 31 of Moto's MPC7447AEC.pdf.
>
> bash-2.05b$ cat /proc/device-tree/clock-frequency | xxd
> 0000000: 07ef 4679 ..Fy
> bash-2.05b$ python -c 'print "%d" % 0x07ef4679'
> 133121657
>
> Looks sensible to me. Does it give you any clues?
Not sure at this point, play with DFS during boot and see what bogomips
you get maybe...
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2004-05-31 23:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-30 14:01 nearly-working support for cpufreq on 2004 iBook G4 with 7447A cpu John Steele Scott
2004-05-30 22:43 ` Benjamin Herrenschmidt
2004-05-30 22:43 ` Benjamin Herrenschmidt
2004-05-31 0:32 ` John Steele Scott
2004-05-31 0:29 ` Benjamin Herrenschmidt
2004-05-31 3:49 ` Benjamin Herrenschmidt
2004-05-31 8:37 ` John Steele Scott
2004-05-31 23:41 ` Benjamin Herrenschmidt [this message]
2004-05-31 23:47 ` Benjamin Herrenschmidt
2004-06-01 2:05 ` nearly-working support for cpufreq on 2004 iBook G4 with 7447Acpu John Steele Scott
2004-06-01 2:53 ` Benjamin Herrenschmidt
2004-06-02 11:08 ` nearly-working support for cpufreq on 2004 iBook G4 with 7447A cpu John Steele Scott
2004-06-03 22:26 ` Benjamin Herrenschmidt
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