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external peripheral access csp4


I have an access problem to the port_csp4_addr from the kernel.

Unable to handle kernel access at virtual address a0000000.

I use the following function :

left= copy_to_user(buf, (void *)port_csp4_addr, n);

I fact I just want to read a bloc of bytes from the physical address


Claude GIRERD 
Institut de Physique Nucleaire de Lyon
4, rue Enrico Fermi (Campus de la DOUA)
69622 Villeurbanne Cedex
tel: 04 72 44 83 96
fax: 04 72 43 14 52
email: girerd@xxxxxxx.fr