Thanks for your reply.
Now I have yacto image running on my board. Edison hardware guide says pins 44,58,60,62,64,66,68,70 are multiplexed as both for GPIO and sd card interface. How to configure these pins for SDcard interface. Can it be done from u-boot prompt. I tried looking for mux.c file in ubootsource/boards/x86/edison but edison directory itself was not found. I downloaded u-boot for edison from following location GitHub - 01org/edison-u-boot.
Looking forward for your reply. Thanks in advance.
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The SD card pins are occupied by the SD card Linux driver.
If you want to use them, you have to recompile the Linux kernel without the SD driver first.
See this thread: Can't use GPIO 77 with MRAA
I reread your question. Do you actually want to connect an SD card to these pins? It should be configured already as there is an SD card on the Arduino board.