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help about driver module

Altera_Forum
Honored Contributor II
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hi all, 

my work is based nios2-linux-20120802 from www.nioswiki.com 

i write a char device driver, if the driver is "compile-in" with the kernel, all things are ok! 

but if the driver is compile as a loadable module, errors occurs: 

 

ERROR: "__ioremap" [drivers/char/test.ko] undefined! 

ERROR: "__iounmap" [drivers/char/test.ko] undefined! 

__ioremap is defined in <asm/io.h> , which is# included in my test.c.  

 

what's the problem?
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