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

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

[Clément Bœsch]

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.
---
 configs/orangepi_zero_defconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configs/orangepi_zero_defconfig b/configs/orangepi_zero_defconfig
index c650ce87d9..16a3929aa5 100644
--- a/configs/orangepi_zero_defconfig
+++ b/configs/orangepi_zero_defconfig
@@ -2,7 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_SUNXI=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_MACH_SUN8I_H3=y
-CONFIG_DRAM_CLK=672
+CONFIG_DRAM_CLK=624
 CONFIG_DRAM_ZQ=3881979
 CONFIG_DRAM_ODT_EN=y
 # CONFIG_VIDEO_DE2 is not set
-- 
2.13.3

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

[Jagan Teki]

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

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.

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

[Jan Kiszka]

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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[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@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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