Re: [U-Boot] [PATCH] sunxi: Remove Orangepi PC RAM speed to 624 MHz

[Hans de Goede]

Hi,

On 24-12-15 17:08, Ian Campbell wrote:

On Wed, 2015-12-23 at 11:50 +0100, Hans de Goede wrote:

There are some reports of stability issues at 672 MHz, see:
http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit


Looks like only one (in that table at least)?


Correct, but another 7 out of 13 are only just reliable at
672 and fail one speed step higher, showing that the manufacturer
default of 672 is cutting it awfully close to the failure point,
this feels like the factory default is actually an overclocked
setting.


And do we expect this
data to remain in the wiki, I suppose so.


Ack.


In any case, this...

So reduce the DRAM speed to 624MHz which seems to be reliable
everywhere.


...seems reasonable to me.


Signed-off-by: Hans de Goede 


Acked-by: Ian Campbell 


Thanks,

Hans
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Re: [U-Boot] [PATCH] sunxi: Remove Orangepi PC RAM speed to 624 MHz

[Peter Korsgaard]

> "Hans" == Hans de Goede  writes:

 > There are some reports of stability issues at 672 MHz, see:
 > http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit

 > So reduce the DRAM speed to 624MHz which seems to be reliable everywhere.

With the subject s/Remove/Reduce/

Acked-by: Peter Korsgaard 

 > Signed-off-by: Hans de Goede 
 > ---
 >  configs/orangepi_pc_defconfig | 2 +-
 >  1 file changed, 1 insertion(+), 1 deletion(-)

 > diff --git a/configs/orangepi_pc_defconfig b/configs/orangepi_pc_defconfig
 > index 75afca9..358caa5 100644
 > --- a/configs/orangepi_pc_defconfig
 > +++ b/configs/orangepi_pc_defconfig
 > @@ -1,7 +1,7 @@
 >  CONFIG_ARM=y
 >  CONFIG_ARCH_SUNXI=y
 >  CONFIG_MACH_SUN8I_H3=y
 > -CONFIG_DRAM_CLK=672
 > +CONFIG_DRAM_CLK=624
 >  CONFIG_DRAM_ZQ=3881979
 >  CONFIG_DRAM_ODT_EN=y
 >  # CONFIG_VIDEO is not set
 > -- 
 > 2.5.0

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-- 
Bye, Peter Korsgaard
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Re: [U-Boot] [PATCH] sunxi: Remove Orangepi PC RAM speed to 624 MHz

[Ian Campbell]

On Wed, 2015-12-23 at 11:50 +0100, Hans de Goede wrote:
> There are some reports of stability issues at 672 MHz, see:
> http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit

Looks like only one (in that table at least)? And do we expect this
data to remain in the wiki, I suppose so.

In any case, this...
> So reduce the DRAM speed to 624MHz which seems to be reliable
> everywhere.

...seems reasonable to me.

> Signed-off-by: Hans de Goede 

Acked-by: Ian Campbell 

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