From: Bjorn Helgaas <bhelgaas@google.com>
To: Prashant Bhole <prashantsmailcenter@gmail.com>
Cc: linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: Kernel cannot see PCI device
Date: Wed, 18 May 2011 08:14:57 -0600 [thread overview]
Message-ID: <BANLkTim22Lm=TG9vP+XH25k04ncX=kqy8g@mail.gmail.com> (raw)
In-Reply-To: <BANLkTi=tvyOPoN3f3v_C+NuVOwr+YKaRJA@mail.gmail.com>
On Wed, May 18, 2011 at 4:02 AM, Prashant Bhole
<prashantsmailcenter@gmail.com> wrote:
> On Mon, May 2, 2011 at 10:21 AM, Prashant Bhole
> <prashantsmailcenter@gmail.com> wrote:
>>
>> Hi,
>> I have a custom made powerpc 460EX board. On that board u-boot
>> can see a PCI device but Linux kernel cannot see it. What could be the p=
roblem?
>>
>> On u-boot "pci =A02" commands displays following device:
>> Scanning PCI devices on bus 2
>> BusDevFun =A0VendorId =A0 DeviceId =A0 Device Class =A0 =A0 =A0 Sub-Clas=
s
>> _____________________________________________________________
>> 02.00.00 =A0 0x1000 =A0 =A0 0x0072 =A0 =A0 Mass storage controller 0x00
>>
>> And when the kernel is booted, there is only one pci device (bridge):
>> #ls /sys/bus/pci/devices
>> 0000:80:00.0
>>
>
> I am still facing in this problem.
>
> a call to pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l) return=
s
> positive value in the function pci_scan_device(), which means VENDOR_ID r=
eading
> failed. I could not find the reason. Any hints?
Hmm... probably powerpc-related, so I added linuxppc-dev.
My guess would be that Linux didn't find the host bridge to the
hierarchy containing bus 2. I would guess the host bridge info is
supposed to come from OF. More information, like the complete u-boot
PCI scan and the kernel dmesg log, would be useful. And maybe u-boot
has a way to dump the OF device tree?
next parent reply other threads:[~2011-05-18 14:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <BANLkTimm98Xxx8y9qM8DUSR4rTDPSFpgHw@mail.gmail.com>
[not found] ` <BANLkTi=tvyOPoN3f3v_C+NuVOwr+YKaRJA@mail.gmail.com>
2011-05-18 14:14 ` Bjorn Helgaas [this message]
2011-05-19 12:41 ` Kernel cannot see PCI device Prashant Bhole
2011-05-19 17:58 ` Bjorn Helgaas
2011-05-19 23:12 ` Benjamin Herrenschmidt
2011-05-19 23:19 ` Bjorn Helgaas
2011-05-24 4:55 ` Prashant Bhole
2011-05-24 21:43 ` Benjamin Herrenschmidt
2011-05-25 9:57 ` Stefan Roese
2011-05-25 10:48 ` Prashant Bhole
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='BANLkTim22Lm=TG9vP+XH25k04ncX=kqy8g@mail.gmail.com' \
--to=bhelgaas@google.com \
--cc=linux-pci@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=prashantsmailcenter@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).