[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: PCI init: failure to detect device (SOLVED)

To: kernelnewbies@xxxxxxxxxxxx
Subject: Re: PCI init: failure to detect device (SOLVED)
From: Grant <email@xxxxxxxxxxxxxxx>
Date: Thu, 3 Jun 2004 09:11:54 -0700
List-archive: <http://mail.nl.linux.org/kernelnewbies/>
List-help: <mailto:ecartis@nl.linux.org?Subject=help>
List-id: <kernelnewbies.nl.linux.org>
List-owner: <mailto:riel@nl.linux.org>
List-post: <mailto:kernelnewbies@nl.linux.org>
List-software: Ecartis version 1.0.0
List-subscribe: <mailto:kernelnewbies-request@nl.linux.org?Subject=subscribe>
List-unsubscribe: <mailto:kernelnewbies-request@nl.linux.org?Subject=unsubscribe>
Sender: kernelnewbies-bounce@xxxxxxxxxxxx
User-agent: Mutt/1.5.6i

After pouring through the technical specifications for the n-th time, I finally managed to figure out what is happening.

The ICH5 has a DEVICE_HIDE register that is being set by the BIOS, so that the SATA controller is hidden from the kernel. The kernel PCI probe does not bother to un-hide the device. It is possible to un-hide the device by writing to the register before PCI configuration. It is NOT possible to unhide it using my BIOS.

It was a satisfying exercise to follow the PCI probe code around drivers/pci/probe.c


-- 
Grant Murray

--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/

Prev by Date: Re: questions on ip_input.c
Next by Date: Re: another question on skbuff.h
Previous by thread: Re: another question on skbuff.h
Next by thread: netif_rx
Index(es):
- Date
- Thread