[U-Boot] [PATCH] sunxi: lower the DRAM frequency of Nano Pi NEO2 to 504MHz
Icenowy Zheng
icenowy at aosc.io
Thu Nov 2 08:27:51 UTC 2017
在 2017-11-02 16:25,Jagan Teki 写道:
> On Thu, Nov 2, 2017 at 9:06 AM, Icenowy Zheng <icenowy at aosc.io> wrote:
>> The BSP of Nano Pi NEO2 provided by FriendlyARM uses 504MHz DRAM
>> frequency, which is much lower than the current 672MHz used in
>> mainline.
>>
>> Switch to use the BSP-provided frequency 504MHz for DRAM.
>>
>> Thanks to Thomas Kaiser, who pointed out the frequency problem.
>>
>> Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
>> ---
>> configs/nanopi_neo2_defconfig | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/configs/nanopi_neo2_defconfig
>> b/configs/nanopi_neo2_defconfig
>> index b8e089176f..e210af4f0e 100644
>> --- a/configs/nanopi_neo2_defconfig
>> +++ b/configs/nanopi_neo2_defconfig
>> @@ -1,7 +1,7 @@
>> CONFIG_ARM=y
>> CONFIG_ARCH_SUNXI=y
>> CONFIG_MACH_SUN50I_H5=y
>> -CONFIG_DRAM_CLK=672
>> +CONFIG_DRAM_CLK=504
>
> Can you point me the BSP, here what I refer to have [1]
The file at [1] is just from mainline.
The BSP configuration is at [2].
[2]
https://github.com/friendlyarm/h5_lichee/blob/master/tools/pack/chips/sun50iw2p1/configs/cheetah-p1/board/sys_config_nanopi-neo2.fex
>
> [1]
> https://github.com/friendlyarm/u-boot/blob/sunxi-v2017.x/configs/nanopi_neo2_defconfig
>
> thanks!
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