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, icen...@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 <icen...@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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