[coreboot] AMDk8 - HT routing

[Marc Jones]

Viswesh S wrote:
> Hi,
>  
> I am looking into the Linux bios code for AMD 64 boards.
>  
> In the setup_coherent_ht_domain function, we have functions 
> setup_smp() and setup_smp2().
>  
> In the setup_smp2(), say the link1 is coherent and connected, we write 
> the routing table for it, but then we veriify the connection for Node7 
> and then try to set the routing table registers for the link between 7 
> and 1.
>  
> //*
> print_linkn("(0,1) link=", byte);
>  setup_row_direct(0,1, byte); //
>  setup_temp_row(0, 1);
>  
>  verify_connection(7);
>  /* We found 2 nodes so far */
>  val = pci_read_config32(NODE_HT(7), 0x6c);
>  byte = (val>>2) & 0x3; /*get default link on node7 to node0*/
>  print_linkn("(1,0) link=", byte);
>  setup_row_local(7,1);
>  setup_remote_row_direct(1, 0, byte);
> *//
>  
> What is the logic reason behind checking the node7 here.
>  
> In the case of my board, there is no Node7 itself and will the 
> pci_write(outb instruction) cause any unknown behaviour, as the node 
> is not present.
>  
> Thanks,
>  
> Viswesh
>
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Hi Viswesh,

All AP nodes are node7 until they have been found and initialized by the 
BSP. The BSP looks at each active link and then sets the nodeids.

Marc


-- 
Marc Jones
Senior Firmware Engineer
(970) 226-9684 Office
mailto:Marc.Jones at amd.com
http://www.amd.com/embeddedprocessors