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imx8: disable turbo mode, set to 1.4GHz which is stable on first boot

--- a/sys/src/9/imx8/clock.c

+++ b/sys/src/9/imx8/clock.c

@@ -46,7 +46,7 @@

 		/* TURBO! */

 		setclkrate("ccm_arm_a53_clk_root", "osc_25m_ref_clk", 25*Mhz);

-		setclkrate("ccm_arm_a53_clk_root", "arm_pll_clk", 1600*Mhz);

+		setclkrate("ccm_arm_a53_clk_root", "arm_pll_clk", 1400*Mhz);

 	}

 	tstart = sysrd(CNTPCT_EL0);

 	do{

-- 

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