[U-Boot] [PATCH] sunxi: reduce Orange Pi Zero DRAM clock speed

[Jan Kiszka]

On 2018-05-31 19:36, Jan Kiszka wrote:
> On 2017-08-11 12:21, Jagan Teki wrote:
>> On Mon, Jul 24, 2017 at 1:44 AM, Clément Bœsch <u at pkh.me> wrote:
>>> Using `fel-boot-lima-memtester-on-orange-pi-pc 672` on an Orange Pi
>>> without heatsink results in the following error after a few minutes:
>>>   WRITE FAILURE: 0x00200000 != 0xffdfffff at offset 0x0137f47c (bitflip).
>>>
>>> Also, the constructor repository (github/orangepi-xunlong) seems to
>>> contain that 624 Mhz clock speed in its u-boot fork. It may be that 672
>>> Mhz is the advertized overclocked speed.
>>>
>>> According to http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit
>>> it may be worth decreasing that value with other Orange Pi boards.
>>>
>>> See also e7d6aa0b74b7f4d08ee68da8a586c76c761348e2.
>>
>> Applied to u-boot-sunxi/master
>>
> 
> I've a 1.5 years old OPi Zero that was running uboot 2017.01 so far. I
> just tried to update to 2018.05, also using the new defconfig. The
> result was that uboot got stuck early during the first lines of output.
> Then I changed the DRAM clock back to 672, and things seem to work find.
> 
> Are we facing different board revisions that need different settings, or
> could the lowering be incorrect?

Sorry, false alarm. Seems I messed up something when writing out the 624
MHz version and happen to fix that while testing the 672 one. But now
also the upstream config works. And I suspect/hope that the lower
frequency will resolve the sporadic crashes of the board that I saw in
the past...

Thanks,
Jan

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