Tyan S2891 and CentOS -- 6, 8, 10+ PCI busses in today's new systems

[rik at harddata.com (rik@xxxxxxxxxxxx)]

> rik@xxxxxxxxxxxx wrote:
>> Thanks for the hints on using pci=.  I got it to work.
>> I couldn't find where pci=bios was documented but that
>> option didn't work.
>
> Boot Prompt HOWTO, Section 4:
>   http://www.tldp.org/HOWTO/BootPrompt-HOWTO-4.html
>
>> I read in the kernel docs in regards to booting and tried
>> pci=conf1 and this worked.
>
>>From the HOWTO ...
>
>   4.2 The `pci=bios' and `pci=nobios' Arguments
>   These are used to set/clear the flag indicating that
>   the PCI probing is to take place via the PCI BIOS.
>   The default is to use the BIOS.
>   4.3 The `pci=conf1' and `pci=conf2' Arguments
>   If PCI direct mode is enabled, the use of these enables
>   either configuration Type 1 or Type 2. These implicitly
>   clear the PCI BIOS probe flag (i.e. `pci=nobios') too.

This must be old documentation.  The pci=nobios flag didn't work.

The problem was fixed by adjusting a BIOS setting.  By changing the
Installed OS to Linux I am able to boot the machine without any boot
flags.

>
> So you actually want to use "pci=nobios" (my bad).

Rik