On 05/10/2015 12:29, Mingyu Li wrote:
> according to mtk sdk 4300 at kernel version linux-2.6.36.x
> at 40Mhz Xtal it use 20 not 40.
>
> #elif defined (CONFIG_RALINK_MT7621)
> case 0:
> reg = (*(volatile u32 *)(RALINK_SYSCTL_BASE + 0x44));
> cpu_fdiv = ((reg >> 8) & 0x1F);
> cpu_ffrac = (reg & 0x1F);
> mips_cpu_feq = (500 * cpu_ffrac / cpu_fdiv) * 1000 * 1000;
> break;
> case 1: //CPU PLL
> reg = (*(volatile u32 *)(RALINK_MEMCTRL_BASE + 0x648));
> fbdiv = ((reg >> 4) & 0x7F) + 1;
> reg = (*(volatile u32 *)(RALINK_SYSCTL_BASE + 0x10));
> reg = (reg >> 6) & 0x7;
> if(reg >= 6) { //25Mhz Xtal
> mips_cpu_feq = 25 * fbdiv * 1000 * 1000;
> } else if(reg >=3) { //40Mhz Xtal
> mips_cpu_feq = 20 * fbdiv * 1000 * 1000;
> } else { // 20Mhz Xtal
> /* TODO */
> }
> break;
> #elif defined (CONFIG_RALINK_MT7628)
>
ok, will look at the datasheet later on today to verify this
JOhn
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