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Hello Octocontrabass

if i read and write elkhart lake RTC register with assembly in and out instruction (0x70 and 0x71)

RDC, 614109- chapter 27.2

but i if do it with mmio(FD00000h + 70h/71h) i am not able to do it. i am using the same procedure as we do with in and out instruction

thanks
Ravi

That looks like a copy/paste error in the datasheet. You can't use MMIO to access the RTC.