[U-Boot] U-boot : compare read and expect value

[Khalid Tourabi]

Hi,
I'm newbie and I want to use scripts to test the board peripherals (I2C, 
SPI, LAN, PCIe, USB, ...) using u-boot.
My problem is how to compare the reading with the expected value?
the reading is in an environment variable? If so which one?
I searched the forums and docs without success.

Thanks & Best Regards,

Khalid