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

[Jan Kiszka <jan.kiszka@web.de>]

On 2017-08-11 12:21, Jagan Teki wrote:
> On Mon, Jul 24, 2017 at 1:44 AM, Clément Bœsch <u@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?

Jan

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