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

[icenowy at aosc.io]

于 2017年10月31日 GMT+08:00 下午4:59:34, Jagan Teki <jagannadh.teki at gmail.com> 
写到:
> On Tue, Oct 31, 2017 at 1:26 PM, Icenowy Zheng <icenowy at aosc.io> 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.
> 
> I'm not sure, since ddr can be keyrole IP during relocation and falcon
> mode(which I'm trying) but we can make sure the ddr test in uboot
> atleast?

Some issues will only appear under heavy load, which is difficult to
emulate by u-boot.

To expose the issue by memtester I used two background
tasks: one is infinite tinymembench, the other is building a Linux 
kernel with -j4.

> 
> thanks!