Re: [coreboot] AMDk8 - HT routing

[Marc Jones]

Viswesh S wrote:
> Hi,
>
> But when you read the registers of Node7, as the device is not there, 
> what value will it return, if we try to read any register, say 0x6c for 
> getting the default link.
>
> val = pci_read_config32(NODE_HT(7), 0x6c);   // What value does get 
> return, as node7 is not there.
>  byte = (val>>2) & 0x3; /*get default link on node7 to node0*/
>
> Viswesh

Viswesh,

All AP nodes are node7 until re-numbered in the initialization process. 
Your node1 is node7 until it is told to be node1. A device that isn't 
attached (no ht link) should never be written to.

Marc
> ----- Original Message ----
> From: Marc Jones 
> To: Viswesh S 
> Cc: [e-mail]
> Sent: Wednesday, 7 May, 2008 9:38:13 PM
> Subject: Re: [coreboot] AMDk8 - HT routing
>
> 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
>
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