On Sat, 19 Dec 2015 22:18:28 +0100 Thomas Kaiser <thomas.kai...@phg-online.de> wrote:
> Siarhei Siamashka wrote: > > > It's likely that the credit for "unlocking" the 1.5 GHz clock speed > > actually belongs to third-party modders. > > Thanks for clarifying this (and all the additional informations). I'll > try to correct this where I spread wrong "informations"/assumptions > asapissimo. > > > As there were no real objections, I have just pushed the Orange Pi PC > > fex file to the sunxi-boards repository. This makes it the first FEX > > file for the H3 SoC :-) > > Great. Only one single question (I've overlooked before). Why > > boot_clock = 1200 > > (especially since you wrote about SY8106A's default 1.2V voltage being > safe for operation at 1008 MHz) Thanks, that was a good question. The "boot_clock" parameter is not used by the linux kernel. It's the Allwinner's bootloader thing. You can grep the H3 SDK sources to check this. As for the other things left to do, the DRAM clock speed needs to be adjusted in the FEX file after we find a reasonable default DRAM clock speed. The reason is that on every cooling state change in the 3.4 kernel (after crossing any temperature threshold, for example 70C), there is a hook into the DRAM reclocking code. This code simply sets 480MHz DRAM clock speed if the temperature is 100C or higher. And if the temperature is below 100C, then the dram clock value from FEX is used. -- Best regards, Siarhei Siamashka -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
