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

[icenowy at aosc.io]

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

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