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Re: PCI-enum and SouthBridge behaviour...

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On 24/07/2016 18:54, wolfgang kern wrote:
> James Harris replied:

...

>> Walking the PCI bus (and other busses connected thereto) should
>> enumerate everything, shouldn't it, on any PC made in the last 20
>> years or so? Before that there was PnP which would also allow
>> enumeration.
>
> Yes, but its hard to enumerate a device that dont show up.
> perhaps thats why windoze need a lot of 'drivers' from mainboard vendor
> and several reboot cycles to make all these unseen work.

Microsoft has always had the big advantage that hardware manufacturers 
will privately tell MS about their devices.

That said, Linux has to cope with the same problems. Maybe you could 
look at the Linux source?


>> That said, some chipsets may require special bits to be set in
>> registers or they will hide some of their hardware. Is that the
>> problem you are facing?
>
> Exact. I suspect that the BIOS modify too many southbridge bits for SATA.
> I hoped there were known BIOS-functions to overrule this behaviour...

That does sound like a good use for a BIOS because it would know what 
idiosyncratic hardware a machine contains. I don't know of any such 
functions.


> Meanwhile I have to run my whole PCI-scan one more time after chip-type
> recognition and device enabling.

That may be the only option. I guess that detecting chipset types is not 
easy to do reliably.

Measures of desperation: I take it there is no way on PCI scanning to 
reset busses and devices such that the hidden components are revealed? 
Any clue in /why/ the BIOS might hide some devices?

Your PCI scan won't take long, will it?

-- 
James Harris

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PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-22 21:53 +0200
  Re: PCI-enum and SouthBridge behaviour... James Harris <james.harris.1@gmail.com> - 2016-07-24 16:52 +0100
    Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-24 19:54 +0200
      Re: PCI-enum and SouthBridge behaviour... James Harris <james.harris.1@gmail.com> - 2016-07-25 07:07 +0100
        Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-25 11:04 +0200
          Re: PCI-enum and SouthBridge behaviour... James Harris <james.harris.1@gmail.com> - 2016-07-25 10:30 +0100
            Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-25 14:06 +0200
              Re: PCI-enum and SouthBridge behaviour... James Harris <james.harris.1@gmail.com> - 2016-07-25 13:16 +0100
                Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-26 13:09 +0200
                Re: PCI-enum and SouthBridge behaviour... James Harris <james.harris.1@gmail.com> - 2016-07-26 15:14 +0100
          Re: PCI-enum and SouthBridge behaviour... Rod Pemberton <NoHaveNotOne@bcczxcfrze.cam> - 2016-07-25 21:55 -0400
            Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-26 12:48 +0200
  Re: PCI-enum and SouthBridge behaviour... Rod Pemberton <NoHaveNotOne@bcczxcfrze.cam> - 2016-07-26 08:18 -0400
    Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-26 20:11 +0200
  Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-28 18:53 +0200
    Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-29 19:47 +0200
      Re: PCI-enum and SouthBridge behaviour... Rod Pemberton <NoHaveNotOne@zxdehrnyya.cam> - 2016-07-29 17:44 -0400
        Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-30 09:44 +0200
    Re: PCI-enum and SouthBridge behaviour... James Harris <james.harris.1@gmail.com> - 2016-07-30 12:55 +0100
      Re: PCI-enum and SouthBridge behaviour... "wolfgang kern" <nowhere@never.at> - 2016-07-30 19:40 +0200
        Re: PCI-enum and SouthBridge behaviour... James Harris <james.harris.1@gmail.com> - 2016-07-30 19:08 +0100

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