[U-Boot] [PATCH] sunxi: set the default CPUx frequency of H5 to 816MHz

[Jagan Teki]

On Tue, Oct 31, 2017 at 1:35 PM,  <icenowy at aosc.io> wrote:
> 在 2017-10-31 15:57，Jagan Teki 写道：
>>
>> On Tue, Oct 31, 2017 at 5:06 AM, Icenowy Zheng <icenowy at aosc.io> wrote:
>>>
>>> Some H5 boards are designed to start at 1.1V CPUx voltage (e.g. Nano Pi
>>> NEO2), which may not work properly at 1008MHz if the chip's quality is
>>> not so good.
>>>
>>> Lower the default CPUx frequency of H5 to 816MHz.
>>>
>>> Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
>>> ---
>>>  arch/arm/mach-sunxi/Kconfig | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
>>> index 09cfec6f57..1fededd0a3 100644
>>> --- a/arch/arm/mach-sunxi/Kconfig
>>> +++ b/arch/arm/mach-sunxi/Kconfig
>>> @@ -397,9 +397,9 @@ config SYS_CLK_FREQ
>>>         default 1008000000 if MACH_SUN5I
>>>         default 1008000000 if MACH_SUN6I
>>>         default 912000000 if MACH_SUN7I
>>> +       default 816000000 if MACH_SUN50I || MACH_SUN50I_H5
>>>         default 1008000000 if MACH_SUN8I
>>
>>
>> Even orangepi pc2 has 1.1v after power-on and it's work fine [1] did
>> you find an issue with neo2?
>
>
> Yes, the boot process randomly hang at SPL stage -- but when it enters
> ATF it will run smoothly as the ATF will re-configure CPUx frequency
> to 816MHz.

OK, Linux has similar issue, I will check it meanwhile.

>
> According to the official operating point table [2], 1008MHz is bound
> to 1.2V, and 816MHz is bound to 1.1V.

Does this common for all H5 SDK or orangepi design?

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