On Wed, Nov 01, 2017 at 08:31:46AM +0800, Icenowy Zheng wrote: > 在 2017-10-31 21:54，Maxime Ripard 写道： > > On Tue, Oct 31, 2017 at 04:05:36PM +0800, [email protected] wrote: > > > 在 2017-10-31 15:57，Jagan Teki 写道： > > > > On Tue, Oct 31, 2017 at 5:06 AM, Icenowy Zheng <[email protected]> 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 <[email protected]> > > > > > --- > > > > > 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? > > > > So you have one single model that fails, and you change the default > > frequency of all the boards using that SoC? > > But I think we have already set the default frequency to 816MHz for > A64, and it seems that several H5 boards are designed to start at 1.1v > (see the notes by Jagan above). > > > > > It seems a bit overkill. > > > > I guess we have two solutions: > > 1) Change the frequency in that board config > > 2) Change the voltage in that board config > > NEO2 don't have any voltage adjusting, it's fixed at 1.1V. > > And according to the Orange Pi PC2 and Prime schematics, they both > start at 1.1V. (The Prime schematics even says "For H5 adjust > VDD-CPUX to 1.1V).
And what about the Zero Plus 2 ? Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
signature.asc
Description: PGP signature
_______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
