To access the host (x86) memory by the agent (mpc8540)

[eyes bh]

Hi...
  
  We are using linux kernel 2.6.9 and mpc8540 as a network card in the host x86.mpc8540 acts as a agent and runs on u-boot.
  
  The steps that we followed to accomplish the above task is as follows:-
  
  1.)Allocated memory using kmalloc and returned the ptrdata....
  
    ptrdata = (unsigned long *) kmalloc( sizeof (unsigned long) , GFP_KERNEL);
  
  2.)We write to pci outbound registers......
  
  (a)pci translation register (b)pci base register (c) pci attribute register.
  
    ulTemp  = ( unsigned volatile long  ) virt_to_bus( ( void * ) ptrdata);
    ulTemp =  swap(ulTemp >> 12) ;
  
   //Outbound Translatiom Register
  
    writel(ulTemp,  (unsigned long)ioaddr+ 0x8C20);
      
  //ioaddr is address that we got after remapping  
  ioaddr = ioremap_nocache((pio_start), pio_len);
  
  //Outbound Base Address Register
  
      writel((swap(0xE0000000 >> 12)) ,  (unsigned long)ioaddr+ 0x8C28);
  
   //Outbound Attribute Register
  
      writel(swap(0x8005501C),  (unsigned long)ioaddr+ 0x8C30);
  
  3.)We used the minicom to check whether we are able to access the host  memory from the agent by doing md 0xE000_0000.But we are getting all  values as zeroes.
  
  Cud anybody solve our problem. tell us if we are missing anything,any step.Please respond to our request.It is urgent.
  
  Thanks
  Aishwariya
  
  
 
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