349 lines
9.2 KiB
Plaintext
349 lines
9.2 KiB
Plaintext
.\" $NetBSD: prep,v 1.15 2000/11/05 21:30:22 pk Exp $
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.Ss2 Configuring your PROM
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.
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Before you start, you should configure your PROM. There are three
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categories of PROM:
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.Dq sunmon
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(sometimes called Restricted Prompt, sun monitor, or old command mode),
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OpenBoot PROM 1, and OpenBoot PROM 2.
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The sun4 machines only have sunmon. Some of the early sun4c models
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default to sunmon but have OpenBoot PROM 1.
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The later sun4c models and all sun4m models have OpenBoot PROM 2.
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.Pp
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First, you need to stop your system from automatically booting when
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powered on. Pressing the
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.Key STOP
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key (sometimes called the
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.Key L1
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key, found on the left side of your keyboard) and the
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.Key a
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key will halt your system and give you a PROM prompt. If you are using a
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Tadpole SPARCbook, you press the
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.Key Pause
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and
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.Key a
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keys. If you are using a serial console, send a
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.Dq BREAK
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signal from your terminal (the method of sending
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.Dq BREAK
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varies from terminal to terminal).
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.Pp
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Next, you should set your system to always use the OpenBoot PROM
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(sometimes called
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.Dq "new command mode" )
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if it defaults to sunmon. The
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.Nx
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kernel relies on some of the functionality provided by the OpenBoot PROM.
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If your machine gives you a `\*>' prompt instead of an `ok' prompt,
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type:
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.Pp
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.Dl \*> Ic n
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.Dl ok Ic setenv sunmon-compat? false
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.Dl ok
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.Pp
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Next, if you are using any security features of OpenBoot PROM, you should
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turn them off - NetBSD can't deal well with this.
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.Pp
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.Dl ok Ic setenv security-mode none
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.Pp
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The OpenBoot PROM 1 machines (SPARCstation/server 1, SPARCstation/server 1+,
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IPC, and SLC) have an odd SCSI quirk you should be aware of.
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There are three SCSI addressing schemes used by your
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system: SCSI target ID (set by physical jumpers on the device), PROM
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.Sq unit
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number (set by OpenBoot PROM 1, based on its SCSI target ID), and the name
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you reference within an operating system (set by the kernel, based on the PROM
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.Sq unit
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number).
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.Pp
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Sun shipped these systems with the internal drives set to SCSI target IDs
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3 and 1. The default value of the OpenBoot PROM variable
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.Sq Li sd-targets
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is
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.Sq Li 31204567.
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This variable maps how the OpenBoot PROM 1 assigns
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.Sq unit
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numbers based on the SCSI target ID.
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Thus the device at SCSI target ID 3 is considered
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.Sq unit
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0, and the SCSI device at target ID 0 is
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.Sq unit
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3. When you type
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.Dq Ic boot scsi(0,0,0) ,
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the OpenBoot PROM will boot from
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.Sq unit
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0 (which is SCSI target ID 3, the internal hard drive). The
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.Tn SunOS
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kernel is hard-wired to map
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.Li sd0
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to SCSI target 3, and
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.Li sd3
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to SCSI target 0.
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.Bl -column -offset indent PROM\ Unit# SCSI\ Target SunOS\ name
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.It Em PROM\ Unit# Ta Em SCSI\ Target Ta Em SunOS\ name
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.It \~\~\~0 Ta \~\~\~3 Ta \~\~\~sd0
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.It \~\~\~1 Ta \~\~\~1 Ta \~\~\~sd1
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.It \~\~\~2 Ta \~\~\~2 Ta \~\~\~sd2
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.It \~\~\~3 Ta \~\~\~0 Ta \~\~\~sd3
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.It \~\~\~4 Ta \~\~\~4 Ta \~\~\~st0
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.It \~\~\~5 Ta \~\~\~5 Ta \~\~\~st1
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.It \~\~\~6 Ta \~\~\~6 Ta \~\~\~cdrom
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.El
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.Pp
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The
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.Nx*M
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.Li GENERIC
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kernel does not wire things down as does
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.Tn SunOS .
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It names the disks in the order
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that the SCSI targets are probed (01234567). If you only have one disk,
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it is always
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.Li sd0
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regardless of its SCSI target ID or its PROM
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.Sq unit
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number, and there are no problems. If you have two disks, one at
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SCSI ID 2 (
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.Sq unit
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2) and SCSI ID 3 (
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.Sq unit
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0), then they are recognized as
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.Li sd0
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and
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.Li sd1
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respectively. This can be a problem if you are not
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aware of it, particularly when creating an fstab.
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.Pp
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There are two approaches to fixing this problem: changing the
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mapping that OpenBoot PROM 1 does, and changing the
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.Nx
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kernel configuration.
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To get OpenBoot PROM 1 to number the SCSI
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.Sq unit
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numbers the same as the SCSI target IDs, you need to run this command:
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.Pp
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.Dl ok Ic "setenv sd-targets 01234567"
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.Pp
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This may, however, cause problems if you were to later attempt to use
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.Tn SunOS
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on this machine or if you reset the OpenBoot PROM variables.
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.Pp
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The other approach is to use a
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.Nx
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kernel that matches the PROM's odd target mapping by treating
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.Sq unit
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0 (i.e. SCSI target ID 3) as
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.Li sd0
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and
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.Sq unit
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3 (i.e. SCSI target ID 0) as
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.Li sd3 .
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The
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.Li GENERIC_SCSI3
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kernel performs this target mapping, but the
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.Li GENERIC
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and
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.Li INSTALL
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kernels do not.
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.Pp
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.(Note
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This is also a concern when you start building your own customised kernels.
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.Note)
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.Pp
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The machines with OpenBoot PROM 2 (SPARCstation/server 2,
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ELC, IPX, and all sun4m models) have s similar SCSI target mapping in the
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form of a
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.Ic devalias
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entry. That is, the device alias
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.Ic disk
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is shorthand for the disk at SCSI ID 3 on the internal SCSI controller.
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Normally, the
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.Ic disk
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device alias is what the PROM uses as the default boot device, i.e. in the
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absence of a
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.Ar device
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argument to the
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.Ic boot
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command.
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Note that there are also pre-configured device alias entries for
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.Ic disk0,
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.Ic disk1,
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.Ic disk2
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and
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.Ic disk3 ,
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which are in fact a one-to-one mapping to the SCSI targets
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.Ic 0
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to
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.Ic 3
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.Pq all on the internal SCSI controller .
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.Pp
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Again, it may be advantageous to use a fixed
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.Dq SCSI target
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to
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.Do
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.Nx
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disk unit
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.Dc
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mapping in your kernel configuration file (such as is done in the
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.Li GENERIC_SCSI3
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kernel) to ensure that your disks remain showing up at the same
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.Nx
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device unit numbers even if you add disks to your system at a later time.
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.
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.Ss2 Determining how to access your SCSI disk from the PROM
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.
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sunmon and OpenBoot PROM 1 use an archaic
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.Li sd( Ns Ar c,u,p Ns Ic \&)
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syntax to address SCSI devices. OpenBoot PROM 2 uses a more intuitive
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syntax using device aliases.
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.Pp
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To calculate the parameters for sunmon and OpenBoot PROM 1:
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.(tag xcc -offset indent
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.It Ar c
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specifies the SCSI controller number (first is 0, second is 1, ...)
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.It Ar u
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the hexadecimal number obtained from evaluating
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the expression
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.Em (8 * TARGET) + LUN
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.It Ar p
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the partition number from which to boot
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.Po
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.Sq Li 0
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=
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.Sq Li a ,
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.Sq Li 1
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=
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.Sq Li b ,
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etc.
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.Pc
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.tag)
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.Pp
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Therefore, to boot from the swap partition on the internal hard drive
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(first SCSI bus, target 0, lun 0, partition 1), one would use:
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.Pp
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.Dl ok Ic "boot sd(0,0,1)"
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.Pp
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To boot from a CD-ROM (first SCSI bus, target 6,
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lun 0, partition dynamically determined), one would use:
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.Pp
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.Dl ok Ic "boot sd(0,30,)"
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.Pp
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And, to boot from a kernel named
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.Li netbsd-GENERIC
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on the fourth partition (
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.Sq Li d ,
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often the
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.Pa /usr
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partition) on an external hard drive (first SCSI bus, target 2, lun 0,
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partition 3), one would use:
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.Pp
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.Dl ok Ic "boot sd(0,10,3)netbsd-GENERIC"
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.Pp
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Now, for OpenBoot PROM 2, SCSI devices are specified by an OpenBOOT
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.Ic devalias
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which provides simple mnemonics for the full path to the device. Type
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.Ic devalias
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in OpenBoot PROM 2 to get a list of all of the available aliases.
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Just the alias and partition are necessary when booting.
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.Pp
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Therefore, to boot from the swap partition on the internal hard drive
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(OpenBoot PROM 2 assumes the internal hard drive is at target 3), one would
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use:
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.Pp
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.Dl ok Ic "boot disk:b"
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.Pp
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To boot from a CD-ROM (OpenBoot PROM 2 assumes the CD-ROM is at target 6),
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one would use:
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.Pp
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.Dl ok Ic "boot cdrom"
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.Pp
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And, to boot from a kernel named
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.Li netbsd-GENERIC
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on the fourth partition (
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.Sq Li d ,
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often the
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.Pa /usr
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partition) on an external hard drive (target 2, partition 3), one would use:
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.Pp
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.Dl ok Ic "boot disk2:d netbsd-GENERIC"
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.Pp
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The full device path specifier for OpenBoot PROM 2 depends on how OpenBoot
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PROM 2 recognizes
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your SCSI controller. Typically, one would use something like:
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.Pa /sbus/esp/sd@ Ns Ar t,p
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where t is the SCSI target and p is the partition number.
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.
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.Ss2 Deciding on partition sizes
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.
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If you're installing
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.Nx*M
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for the first time it's a good idea
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to look at the partition sizes of disk you intend installing NetBSD on.
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.Pp
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Asumming a classic partition scheme with
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.Pa /
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(root) and
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.Pa /usr
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filesystems, a comfortable size for the NetBSD root filesystem partition is
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about 20 MB; a good initial size for the swap partition is twice the amount
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of physical memory in your machine (though, unlike
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.Tn SunOS 4.x ,
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there are no restrictions on the size of the swap partition that would render
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part of your memory unusable). A full binary installation takes about 60 MB
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in
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.Pa /usr .
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.Pp
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Most sparc systems have trouble booting if the root partition extends
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beyond the first 2 GB of your disk.
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.
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.Ss2 Configuration of network interfaces
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.
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Some network devices (i.e. the built-in
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.Em le
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interface on sun4m machines)
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allow a choice between operating on a UTP or a AUI port. The
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.Em le
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driver supports automatic detection of the port which is actually connected to
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the wire. Additionally, some of the Fast ethernet devices (such as
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.Em be ,
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.Em hme ,
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.Em qec ,
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and
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.Em qfe )
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support selection of various speeds and options.
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The default is to attempt to automatically detect the speed.
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.Pp
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If automatic detection is not available or not working properly in your
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environment, you may have to specify the type connection using the
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.Ic media
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parameter of
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.Xr ifconfig 8 .
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During installation, you'll get the opportunity to specify the appropriate
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medium. Use
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.Li 10base5
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or
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.Li AUI
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to select the AUI connector, or
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.Li 10baseT
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or
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.Li UTP
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to select the UTP connector.
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Fast ethernet interfaces default to
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.Li auto ,
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which usually does not detect properly and runs at
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.Sq 10BaseT
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speed.
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The options are
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.Li 10baseT ,
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.Li 10baseTX ,
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and
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.Li auto .
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The
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.Em hme
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and
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.Em qfe
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interfaces also allow
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.Li 10baseT-FDX
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and
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.Li 100baseT-FDX .
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