From: Wolfgang Grandegger <wg@grandegger.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544
Date: Tue, 14 Oct 2008 23:38:34 +0200 [thread overview]
Message-ID: <48F5115A.40805@grandegger.com> (raw)
In-Reply-To: <03F5E48F-D5AC-4FDE-A06B-D49EA109CCD8@kernel.crashing.org>
Kumar Gala wrote:
>>>>> thanks. How did you do the measurements that got you this 1.5x
>>>>> factor?
>>>> This afternoon I re-measured the I2C bus clock frequency with the
>>>> oscilloscope at the I2C clock line on our Socrates MPC8544 board.
>>>> With
>>>> the patch applied, I measured the correct frequency of 100 kHz.
>>>> Without,
>>>> it was a factor of 1.5 too high.
>>> are you able to change cfg_seq_freq on the board?
>> At least I don't know how. It's defined via hardware strap, I imagine.
>
> Its is.. not sure if you have schematics for the board. If you do
> look to see if LWE_B is wired to anything.
I'm going to ask the customer. But even if it's wired, the bit in the
cfg_sec_freq register should reflect properly that case.
Wolfgang.
prev parent reply other threads:[~2008-10-14 21:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-30 8:55 [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544 Wolfgang Grandegger
2008-10-10 3:30 ` Kumar Gala
2008-10-10 7:29 ` Wolfgang Grandegger
2008-10-10 14:09 ` Kumar Gala
2008-10-10 15:16 ` Wolfgang Grandegger
2008-10-14 19:11 ` Wolfgang Grandegger
2008-10-14 19:10 ` Kumar Gala
2008-10-14 19:25 ` Wolfgang Grandegger
2008-10-14 21:04 ` Kumar Gala
2008-10-14 21:38 ` Wolfgang Grandegger [this message]
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