From: Sven Luther <sven.luther@wanadoo.fr>
To: linuxppc-dev@lists.linuxppc.org
Subject: multiple separate pci bridges ...
Date: Thu, 1 Jan 2004 19:11:45 +0100 [thread overview]
Message-ID: <20040101181145.GA27294@iliana> (raw)
Hello,
I am currently trying to port linux to the Pegasos 2, which uses the
Marvell Discovery 2 chip, and has two independent pci controllers, of
which one is faked as an agp bus. This is with a modified 2.4.23 kernel
from the linuxppc_2_4 branch.
Anyway, these two independent controllers both have one bus 0 on them :
PCI bus 0 controlled by pci at 80000000
PCI bus 0 controlled by pci at c0000000
(This coming from chrp_find_bridges).
For the pci bus, at 80000000, a simple indirect access can be used, and
i setup a specialized io ops for the faked agp bus since it needs
special care.
Later, in pcibios_init, there is a problem in the pci_scan_bus. The
first bus has no problems :
Scanning bus 00
Found 00:00 [11ab/6460] 000600 00
Found 00:08 [1106/3044] 000c00 00
Found 00:28 [1000/0001] 000100 00
Found 00:60 [1106/8231] 000601 00
Found 00:61 [1106/0571] 000101 00
Found 00:62 [1106/3038] 000c03 00
Found 00:63 [1106/3038] 000c03 00
Found 00:64 [1106/8235] 000000 00
Found 00:65 [1106/3058] 000401 00
Found 00:66 [1106/3068] 000780 00
Found 00:68 [1106/3065] 000200 00
Fixups for bus 00
Bus scan for 00 returning with max=00
But the second fails with :
PCI: Bus 00 already known
Which comes because in drivers/pci/pci.c:pci_bus_exists does handle only
buses, and thus know nothing of separate pci bridges with the same bus
number, and thus the kernel dies when accessing bus->xxx something in
pcibios_init.
Now, i know that the powermacs in particular, and maybe others, also
have this case of different same numbered pci buses with different base
addresses, and that this kind of situation has already been solved.
So, what is the workaround here, and where does it get set.
Friendly,
Sven Luther
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next reply other threads:[~2004-01-01 18:11 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-01 18:11 Sven Luther [this message]
2004-01-02 4:03 ` multiple separate pci bridges Benjamin Herrenschmidt
2004-01-02 7:40 ` Sven Luther
2004-01-02 7:49 ` Benjamin Herrenschmidt
2004-01-04 21:03 ` Sven Luther
2004-01-04 21:45 ` Benjamin Herrenschmidt
2004-01-04 22:06 ` Sven Luther
2004-01-05 16:40 ` Sven Luther
2004-01-05 21:28 ` Benjamin Herrenschmidt
2004-01-05 21:42 ` Sven Luther
2004-01-05 22:12 ` Benjamin Herrenschmidt
2004-01-06 7:39 ` Sven Luther
2004-01-06 8:00 ` Benjamin Herrenschmidt
2004-01-06 8:11 ` Sven Luther
2004-01-06 14:40 ` Geert Uytterhoeven
2004-01-06 14:45 ` Sven Luther
2004-01-06 15:33 ` Rob Baxter
2004-01-06 17:44 ` Sven Luther
2004-01-06 21:37 ` Benjamin Herrenschmidt
2004-01-06 22:10 ` Marcus Barrow
2004-01-06 22:17 ` Rob Baxter
2004-01-06 22:31 ` Benjamin Herrenschmidt
2004-01-07 2:35 ` Sven Luther
2004-01-07 2:36 ` Benjamin Herrenschmidt
2004-01-07 2:40 ` Sven Luther
2004-01-07 9:02 ` Michael Schmitz
2004-01-07 9:23 ` Benjamin Herrenschmidt
2004-01-07 9:56 ` Sven Luther
2004-01-07 10:27 ` Michael Schmitz
2004-01-13 9:56 ` Sven Luther
2004-01-13 10:26 ` Sven Luther
2004-01-18 12:15 ` Sven Luther
2004-01-18 13:00 ` Michel Dänzer
2004-01-18 13:14 ` Sven Luther
2004-01-19 9:12 ` Benjamin Herrenschmidt
2004-01-18 22:27 ` Sven Luther
2004-01-18 22:59 ` Benjamin Herrenschmidt
2004-01-19 9:21 ` Sven Luther
2004-01-18 23:24 ` Benjamin Herrenschmidt
2004-01-05 21:38 ` Marcus Barrow
2004-01-06 7:14 ` Sven Luther
2004-01-06 7:56 ` Benjamin Herrenschmidt
2004-01-06 8:20 ` Sven Luther
2004-01-02 18:34 ` Geert Uytterhoeven
2004-01-02 15:18 ` Rob Baxter
2004-01-02 23:56 ` Benjamin Herrenschmidt
2004-01-03 0:27 ` Rob Baxter
2004-01-03 1:12 ` Benjamin Herrenschmidt
2004-01-05 0:52 ` Rob Baxter
2004-01-05 2:13 ` Benjamin Herrenschmidt
2004-01-06 20:53 Marcus Barrow
2004-01-06 21:09 Marcus Barrow
2004-01-06 22:59 ` Benjamin Herrenschmidt
2004-01-06 23:00 ` Benjamin Herrenschmidt
2004-01-18 14:44 Sven Luther
2004-01-18 16:33 ` Michel Dänzer
2004-01-18 17:28 ` Sven Luther
2004-01-18 18:24 ` Michel Dänzer
2004-01-18 22:20 ` Sven Luther
2004-01-18 23:33 ` Michel Dänzer
2004-01-19 9:55 ` Sven Luther
2004-01-19 13:48 ` Sven Luther
2004-01-19 13:54 ` Geert Uytterhoeven
2004-01-19 14:00 ` Sven Luther
2004-01-19 14:02 ` Michel Dänzer
2004-01-19 14:16 ` Sven Luther
2004-01-19 14:31 ` Michel Dänzer
2004-01-19 9:11 ` Benjamin Herrenschmidt
2004-01-18 22:33 ` Sven Luther
2004-01-18 23:23 ` Michel Dänzer
2004-01-18 23:42 ` Benjamin Herrenschmidt
2004-01-19 0:03 ` Michel Dänzer
2004-01-19 10:08 ` Geert Uytterhoeven
2004-01-19 11:41 ` Benjamin Herrenschmidt
2004-01-19 12:03 ` Sven Luther
2004-01-19 21:35 ` Benjamin Herrenschmidt
2004-01-19 22:08 ` Sven Luther
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=20040101181145.GA27294@iliana \
--to=sven.luther@wanadoo.fr \
--cc=linuxppc-dev@lists.linuxppc.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.