New subject: 答复: Why devices ARE or NOT on bus 0 ?

26 Apr 2004


      Does "up" "across" control something now?
cpu k8 "cpu0"
        register "across" = "{ .chip = &amd8131, .ht_width=16, .ht_speed=600
}"
end
YH
-----邮件原件-----
发件人: ebiederman@lnxi.com [mailto:ebiederman@lnxi.com] 
发送时间: 2004年4月26日 16:20
收件人: Li-Ta Lo
抄送: LinuxBIOS
主题: Re: Why devices ARE or NOT on bus 0 ?
Li-Ta Lo ollie@lanl.gov writes:
...
On Mon, 2004-04-26 at 11:58, Eric W. Biederman wrote:
...
Li-Ta Lo ollie@lanl.gov writes:
...
...
You might need to specify the bridges/busses in Config.lb.
I know the current code works and can handle this.
...
Does anyone can help on this ?
Without something like a serial console trace so that the details
of what are going on are clear I don't know.
Please see that attached log. As you ca see the HyperTransport scan
is not actually done in northbridge.c:amdk8_scan_chain(). It only
prints the message before and after the for loop but skip the loop.
Please reread my hunch below.  It looks like I nailed it on the head.
The fact that the first pci_scan_bus shows devices below 0x18 is
confirmation of this.
mainboard_operations needs to specify amdk8_scan_root_bus.
What exactly are you talking about ? It is amdk8_scan_root_bus
in ibm/e325/mainboard.c.
static struct device_operations mainboard_operations = {
   .read_resources   = root_dev_read_resources,
   .set_resources    = root_dev_set_resources,
   .enable_resources = enable_childrens_resources,
   .init             = mainboard_init,
   .scan_bus         = amdk8_scan_root_bus,
   .enable           = 0,
};
Hmm.  So it is there.
For some reason it is not being called.  A missing chip.h perhaps?
My old copy of that code does:
    max = pci_scan_bus(&root->link[0], PCI_DEVFN(0x18, 0), 0xff, max);
So it starts at device 0x18 (The first cpu) and works down.  That is
not happening so that code is not being called.
I don't know why/how it is failing except possibly for fragility in
the config tool.  But I observe it is not.
Eric
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