[U-Boot] [PATCH] sunxi: lower the DDR frequency of Orange Pi Prime

[Maxime Ripard]

On Sun, Oct 28, 2018 at 12:26:18AM +0800, Icenowy Zheng wrote:
> 在 2017-10-31二的 09:09 +0100，Maxime Ripard写道：
> > On Tue, Oct 31, 2017 at 03:56:08PM +0800, Icenowy Zheng wrote:
> > > When I use Orange Pi Prime to do some heavy compliation tasks, the
> > > gcc
> > > compiler sometimes mysteriously segfaults, and memtester catches
> > > memory
> > > error. As the lima-memtester cannot support H5 (Mali-450 GPU
> > > equipped),
> > > there's no really reliable way to detect DRAM stability except try
> > > and
> > > error.
> > > 
> > > Lower the DDR frequency to 624MHz seems to solved the issue.
> > > 
> > > Set the default frequency to 624MHz in the defconfig, as 672MHz is
> > > observed to be unstable at least on my board.
> > > 
> > > Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
> > 
> > What is the value used in the fex file?
> 
> When testing with BSP images made by Orange Pi, I found that in newer
> images they secretly tweaked the DDR freq of Orange Pi PC2 and Prime to
> 624MHz.
> 
> This is found by checking pll-dram frequency after booting.

Ok then. Can you resend that patch?

Thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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