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

[Maxime Ripard]

On Tue, Oct 31, 2017 at 06:22:51PM +0800, Icenowy Zheng wrote:
> 在 2017-10-31 18:21，Maxime Ripard 写道：
> > On Tue, Oct 31, 2017 at 04:17:06PM +0800, icenowy at aosc.io wrote:
> > > 在 2017-10-31 16:09，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?
> > > 
> > > 672MHz. The current frequency and ZQ are both the same with FEX. [1]
> > > 
> > > [1] https://github.com/OrangePiLibra/OrangePi_H5SDK/blob/master/external/sys_config.fex
> > 
> > And it breaks the same way on a legacy kernel?
> 
> Sorry but I didn't use any legacy-based solutions on H5.

That should be worth testing then, because if we're using the same RAM
settings and we have stability issues, then we have a bug somewhere,
and putting a blanket on top of it isn't a solution.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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