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Title: Where is CPU/GPU clock set? [Print This Page]

Author: Echoa Time: 12/27/2014 05:54
Title: Where is CPU/GPU clock set?

So ive been attempting to overclock this board, but ive never worked with Rockchip devices so i may be doing something wrong.

Ive adjusted the box-dts and dvfs.c but it doesnt recognize freq beyond 1800mhz. What else do i need to change? This seems to work a bit differently than the Qualcomm and Samsung chips im use to.

also is the GPU clock set in the mali/platform/ like with samsungs mali clk?

edit: might i also need to compile uboot aswell?

Author: Echoa Time: 12/28/2014 00:32

ok I think i have it figured out, i wasnt flashing the resource.img

Now I see new frequencies but when i select anything over 1800mhz my performance drops vs going up

Author: busybee Time: 12/30/2014 09:52

Hi, Echoa. Please PM cappybob, who has rich experience of overclocking RK3288.

Author: Echoa Time: 12/30/2014 13:01

Already did, and i was doing it right but the problem was the the Safety Frequency wasnt allowing for the higher frequencies to be used. Currently I am running 2ghz on the CPU, 700mhz on the GPU, and 1333mhz (667 ddr) on the RAM. If anyone else is trying, make sure you set the kernels safety frequency to the one you want to run, default is 1.6ghz. Also, to reach 2ghz+ you will need to use 1.4v or higher and probably need a heatsink to keep it within respectable temperatures. Though with the current settings I have i get 46000 in Antutu Benchmark already.?

Also, keep in mind that 1.4v is that max within the chips spec, going beyond will risk reducing life of the CPU.

Author: cappybob Time: 12/30/2014 23:13

Way to go Echoa, WOW.?

---cappybob

Author: Echoa Time: 12/31/2014 01:08
Thanks Cappy

BTW I saw in the thread you linked my your going for 2.3ghz. Did you add it to the pll table? You can add it to the table in drivers/clk/rockchip and there should be a cpu pll file in there and it default lists to 2.208ghz but you should be able to add up to 2.4ghz assuming 100 is the divider/multiplier max. I haven't tested it yet but if you're hitting end of pll/freq table that's probably why.

Author: cappybob Time: 12/31/2014 11:25

Echoa

Ole Master of the clock, forgot to say only 42000 for my o/c, but the true magic I do not know.? Again great results?would still like to?see if we can say the rk3288, can be the workhorse for RK (2.3MHZ).? Have you found the core temp yet.? This might cause a problem down the line.? I think ugoos-Sam may boost core voltage for his Ut3?extreme no promise your?kernel to survive without cooling of some sort..

Author: cappybob Time: 1/1/2015 11:27
Thanks CappyBTW I saw in the thread you linked my your going for 2.3ghz. Did you add it to the pll table? You can add it to the table in drivers/clk/rockchip and there should be a cpu pll file in there and it default lists to 2.208ghz but you should be able to add up to 2.4ghz assuming 100 is the divider/multiplier max. I haven't tested it yet but if you're hitting end of pll/freq table that's probably why.

@Echoa

Tried it and there is no100, but there is a 99 and running the 2.376 MHZ. Still have not seen any bragging Antutu scores yet. How about some help, would like to find out what I am missing. I know that I am not missing my beer, needing some as I increase voltages, sorry engineers. Just running 1.50 uv on cpu, needing more beverage before going for more. 2.376 MHZ seems to be it for the CPU. Voltages not sure, so will run stress tests to see if things will survive.

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