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smc91c111 ethernet linux driver problem

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shastri.vs

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hi,
I am writing ethernet driver for smc91c111 lan controller for Gumstix board with PXA270 processor.
Problem is I am not able configure any of the registers. From linux I am writing value but when I readback I am getting only FFFF.
The GPIO pin of pxa is acting as Chip select for lan controller.

I am newbee in this please help.
 

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