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Date: Thu, 7 May 2009 18:47:28 -0700 (PDT)
From: "Sauce.Cheng" <chmhou@sina.com>
To: linuxppc-dev@ozlabs.org
Subject: Re: PPC8247 booting error
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thanks for Scott's following

> You need to pass your physical address (0xd0000000) to ioremap() to
> obtain a virtual address that you can dereference.

actually, i have done that like you said. pass my phy addr to a virtual
addr, but i suppose it is a kernel virtual addr. i wanna get data from phy
in my application of user space. i try it by copy_to_user transfer a kernel
virtual addr to a use virtual addr for using by user. but copy_to_user
failed...

i do it like this

ssize_t read(....,char *buf,....,....)
{
     ....
      kernel_buf = (void *)ioremap(0xD0000000, 4096);
      copy_to_user(buf, kernel_buf, 4096); 
     ....
}




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