251 lines
8.0 KiB
Groff
251 lines
8.0 KiB
Groff
.\" $NetBSD: pcibios.4,v 1.8 2000/08/10 21:19:42 soda Exp $
|
|
.\"
|
|
.\" Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Lennart Augustsson.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
.\" contributors may be used to endorse or promote products derived
|
|
.\" from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.Dd July 22, 2000
|
|
.Dt PCIBIOS 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pcibios
|
|
.Nd introduction to PCI BIOS support
|
|
.Sh SYNOPSIS
|
|
.Cd "options PCIBIOS"
|
|
.Cd "options PCIBIOSVERBOSE"
|
|
.Cd "options PCIBIOS_ADDR_FIXUP"
|
|
.Cd "options PCIBIOS_BUS_FIXUP"
|
|
.Cd "options PCIBIOS_INTR_FIXUP"
|
|
.Cd "#options PCIBIOS_IRQS_HINT=0x0a00 #IRQ 9,11"
|
|
.Cd "#options PCIBIOS_INTR_FIXUP_FORCE"
|
|
.Cd "options PCIBIOS_INTR_GUESS"
|
|
.Cd "#options PCIINTR_DEBUG"
|
|
.Pp
|
|
.Sh INTRODUCTION
|
|
.Nx
|
|
provides support for setting up PCI controllers, bridges, and devices
|
|
using information extracted from the BIOS.
|
|
.Pp
|
|
Ideally, the boot firmware of a machine (a.k.a. BIOS) should set
|
|
up all PCI devices; assigning them I/O and memory addresses and
|
|
interrupts. Alas, this does not always happen, so there is some
|
|
PC specific code that can do the initialization when
|
|
.Nx
|
|
boots.
|
|
.Pp
|
|
Options:
|
|
.Bl -tag -width PCIBIOS_INTR_FIXUP -offset 3n
|
|
|
|
.It Nm PCIBIOS
|
|
turn on the PCI BIOS support.
|
|
|
|
.It Nm PCIBIOSVERBOSE
|
|
make the setup procedure verbose.
|
|
|
|
.It Nm PCIBIOS_ADDR_FIXUP
|
|
fixup PCI I/O and memory addresses.
|
|
.Pp
|
|
Some BIOS implementations don't allocate I/O space and
|
|
memory space for some PCI devices. Especially, a BIOS
|
|
which is
|
|
.Qq PnP OS mode enabled
|
|
shows this behavior.
|
|
Since necessary space isn't allocated, those devices
|
|
will not work without special handling.
|
|
|
|
This option allocates I/O space and memory space
|
|
instead of relying upon the BIOS to do so.
|
|
|
|
If necessary space is already correctly assigned to the devices,
|
|
this option leaves the space as is.
|
|
|
|
Although many BIOS implementations leave CardBus bridges'
|
|
space unallocated, the CardBus bridge device driver doesn't
|
|
require this option, since the driver allocates necessary space
|
|
by itself.
|
|
|
|
.It Nm PCIBIOS_BUS_FIXUP
|
|
fixup PCI bus numbering; needed for many
|
|
.Xr cardbus 4
|
|
bridges.
|
|
.Pp
|
|
Each PCI bus and CardBus should have a unique bus number.
|
|
But some BIOS implementations don't assign a bus number
|
|
for subordinate PCI buses. And many BIOS implementations
|
|
don't assign a bus number for CardBuses.
|
|
|
|
A typical symptom of this is the following boot message:
|
|
.D1 Sy cardbus0 at cardslot0: bus 0 device 0...
|
|
Please note that this cardbus0 has a bus number
|
|
.Sq 0 ,
|
|
but normally the bus number 0 is used by the machine's
|
|
primary PCI bus. Thus, this bus number for cardbus is
|
|
incorrect
|
|
.Pq not assigned .
|
|
In this situation, a device located in cardbus0 doesn't
|
|
show correct device ID,
|
|
because its bus number 0 incorrectly refers to the primary
|
|
PCI bus, and a device ID in the primary PCI bus is shown
|
|
in the boot message instead of the device's ID in the cardbus0.
|
|
|
|
This option assigns bus numbers for all subordinate
|
|
PCI buses and CardBuses.
|
|
|
|
Since this option renumbers all PCI buses and CardBuses,
|
|
all bus numbers of subordinate buses become different
|
|
when this option is enabled.
|
|
|
|
.It Nm PCIBIOS_INTR_FIXUP
|
|
fixup PCI interrupt routing.
|
|
.Pp
|
|
Some BIOS implementations don't assign an interrupt for
|
|
some devices.
|
|
|
|
This option assigns an interrupt for such devices instead
|
|
of relying upon the BIOS to do so.
|
|
|
|
If the BIOS has already assigned an interrupt to a device, this
|
|
option leaves the interrupt as is.
|
|
|
|
.It Nm PCIBIOS_IRQS_HINT
|
|
hint for IRQ use.
|
|
When the
|
|
.Em PCIBIOS_INTR_FIXUP
|
|
cannot guess an adequate IRQ for a device, the hint is used.
|
|
.Pp
|
|
The value is a logical or of power-of-2s of allowable interrupts:
|
|
.Bl -column "XX-0xffff" "XX-0xffff" "XX-0xffff" "XX-0xffff" -compact -offset 2n
|
|
.It Em "IRQ Value" Em "\tIRQ Value" Em "\tIRQ Value" Em "\tIRQ Value"
|
|
.It "\& 0 0x0001" "\t 4 0x0010" "\t 8 0x0100" "\t12 0x1000"
|
|
.It "\& 1 0x0002" "\t 5 0x0020" "\t 9 0x0200" "\t13 0x2000"
|
|
.It "\& 2 0x0004" "\t 6 0x0040" "\t10 0x0400" "\t14 0x4000"
|
|
.It "\& 3 0x0008" "\t 7 0x0080" "\t11 0x0800" "\t15 0x8000"
|
|
.El
|
|
For example,
|
|
.Qq Sy options PCIBIOS_IRQS_HINT=0x0a00
|
|
allows IRQ 9 and IRQ 11.
|
|
|
|
The kernel global variable
|
|
.Va pcibios_irqs_hint
|
|
holds this value,
|
|
so a user can override this value without kernel recompilation.
|
|
For example:
|
|
.Bl -bullet -compact
|
|
.It
|
|
To specify this value on the fly, type the following command
|
|
at the boot prompt to drop into DDB (the in-kernel debugger;
|
|
you have to specify
|
|
.Qq Sy options DDB
|
|
to make kernel with DDB):
|
|
.Dl Ic boot -d
|
|
And type the following command on
|
|
.Qq Sy db>
|
|
prompt:
|
|
.Dl Ic write pcibios_irqs_hint 0x0a00
|
|
Then type the following to continue to boot:
|
|
.Dl Ic c
|
|
.It
|
|
To modify kernel image without kernel recompilation,
|
|
run the following command on shell:
|
|
.Dl Ic gdb --write /netbsd
|
|
And type the following commands at the
|
|
.Qq Sy (gdb)
|
|
prompt:
|
|
.Dl Ic set pcibios_irqs_hint=0xa00
|
|
.Dl Ic quit
|
|
.El
|
|
|
|
.It Nm PCIBIOS_INTR_FIXUP_FORCE
|
|
.Pp
|
|
Some buggy BIOS implementations provide inconsistent
|
|
information between the PCI Interrupt Configuration Register
|
|
and the PCI Interrupt Routing table. In such case,
|
|
the PCI Interrupt Configuration Register takes precedence
|
|
by default. If this happens, a kernel with
|
|
.Em PCIBIOSVERBOSE
|
|
shows
|
|
.Qq Sy WARNING: preserving irq XX
|
|
in the PCI routing table.
|
|
|
|
If
|
|
.Em PCIBIOS_INTR_FIXUP_FORCE
|
|
is specified in addition to the
|
|
.Em PCIBIOS_INTR_FIXUP ,
|
|
the PCI Interrupt Routing table takes precedence.
|
|
In this case, a kernel with
|
|
.Em PCIBIOSVERBOSE
|
|
shows
|
|
.Qq Sy WARNING: overriding irq XX
|
|
in the PCI routing table.
|
|
|
|
The necessity of this option is doubtful, and we may
|
|
remove this option in the future. If you find that this
|
|
option is worth preserving, please report it with send-pr.
|
|
|
|
.It Nm PCIBIOS_INTR_GUESS
|
|
make
|
|
.Em PCIBIOS_INTR_FIXUP
|
|
work with unknown interrupt router.
|
|
.Pp
|
|
If a PCI interrupt router is not known, normally interrupt
|
|
configuraion will not be touched.
|
|
|
|
But if
|
|
.Em PCIBIOS_INTR_GUESS
|
|
is specified in addition to the
|
|
.Em PCIBIOS_INTR_FIXUP ,
|
|
and if a PCI interrupt routing table entry indicates that only
|
|
one IRQ is available for the entry, the IRQ is assumed to be already
|
|
connected to the device, and corresponding PCI Interrupt
|
|
Configuration Register will be configured accordingly.
|
|
|
|
.It Nm PCIINTR_DEBUG
|
|
make the
|
|
.Em PCIBIOS_INTR_FIXUP
|
|
procedure verbose.
|
|
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr cardbus 4 ,
|
|
.Xr pci 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
code appeared in
|
|
.Nx 1.5 .
|
|
.Sh BUGS
|
|
The
|
|
.Em PCIBIOS_ADDR_FIXUP
|
|
option may conflict with the PCI CardBus driver's own
|
|
address fixup.
|