On Wed, Jan 27, 2016 at 2:57 AM, Kuninori Morimoto
<kuninori.morimoto.gx@xxxxxxxxxxx> wrote:
>> commit c61f30a255550bbfc6b83c1ca720661489cac4c0
>> Author: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
>> Date: Fri Dec 18 11:51:36 2015 +0100
>>
>> ARM: dts: armadillo800eva Correct extal1 frequency to 24 MHz
>>
>> This change corrects an long-standing miss-match between the clock speed
>> specified in the kernel (DTS) and what is actually present in the hardware.
>> My understanding is that this can result in unexpected behaviour. I believe
>> Geert can provide more details if needed.
It will cause dividers to be set up incorrectly in drivers, leading to e.g.
slightly off serial baud rates (measured).
> In my (un trusted) memory, the reason why board has 24MHz instead of 25MHz is that
> HW people had noticed that 25MHz clock will be conflict/resonance with HDMI.
> Thus they decided to use 24MHz instead. But some schematic is still indicating 25MHz.
Ah, you have schematics ;-)
That's plausible. All documentation I have says 24 MHz.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
