Seems to be floating around:

# $NetBSD: DREAMCAST,v 1.5.2.1 2000/08/12 19:00:22 msaitoh Exp $
#
# GENERIC -- everything that's currently supported
#

include "arch/evbsh3/conf/std.evbsh3"

# Enable the hooks used for initializing the root memory-disk.
options MEMORY_DISK_HOOKS
options MEMORY_DISK_IS_ROOT # force root on memory disk
options MEMORY_DISK_SERVER=0 # no userspace memory disk support
options MINIROOTSIZE=2880 # size of memory disk, in blocks

options DONT_INIT_BSC

maxusers 16 # estimated number of users

# CPU support
options SH7750
options SH4
options SH4_PCMCIA
options EVBSH4
options MMEYE
options PCLOCK=50000000 # 50MHz
options IOM_ROM_BEGIN=0x00000000
options IOM_ROM_SIZE=0x00100000 # 1MB
options IOM_RAM_BEGIN=0x8c000000
options IOM_RAM_SIZE=0x01000000 # 16MB
options INITTODR_ALWAYS_USE_RTC
options BRAINS
options USE_RTCCLK
options SYNC_CLOCK_TO_RTC

makeoptions LDSCRIPTBASE="shl.x" # for little endian

options LED_ADDR=0xa8000000

# Standard system options
#options UCONSOLE # users can use TIOCCONS (for xconsole)
#options INSECURE # disable kernel security levels

#options RTC_OFFSET=-540
options HZ=64 # clock interrupt generates every 1/HZ sec
#options NTP # NTP phase/frequency locked loop

#options KTRACE # system call tracing via ktrace(1)

#options SYSVMSG # System V-like message queues
#options SYSVSEM # System V-like semaphores
#options SYSVSHM # System V-like memory sharing
#options SHMMAXPGS=1024 # 1024 pages is the default

# Diagnostic/debugging support options
#options DIAGNOSTIC # cheap kernel consistency checks
#options DEBUG # expensive debugging checks/support
#options DDB # in-kernel debugger
#makeoptions DEBUG="-g" # compile full symbol table
#options SYSCALL_DEBUG
#options UVMHIST
#options UVMHIST_PRINT

# Compatibility options
options COMPAT_13 # NetBSD 1.3
options COMPAT_14 # NetBSD 1.4,
options COMPAT_43 # and 4.3BSD

# Executable format options
options EXEC_COFF # COFF executables
options EXEC_ELF32 # 32-bit ELF executables

# File systems
file-system FFS # UFS
file-system MFS # memory file system
#file-system NFS # Network File System client
file-system PROCFS # /proc
file-system KERNFS # /kern
#file-system NULLFS # loopback file system
#file-system UMAPFS # NULLFS + uid and gid remapping

# File system options
#options QUOTA # UFS quotas
#options NFSSERVER # Network File System server

# Networking options
options INET # IP + ICMP + TCP + UDP
#options NFS_BOOT_DHCP # Support DHCP NFS root

#options PCIVERBOSE # verbose PCI device autoconfig messages
#options PCI_CONFIG_DUMP # verbosely dump PCI config space
#options PCMCIAVERBOSE # verbose PCMCIA configuration messages

# Kernel root file system and dump configuration.
#config netbsd root on ? type nfs
#config netbsd root on wd0a type ffs
config netbsd root on ? type ffs

#
# Device configuration
#

mainbus0 at root

shb* at mainbus?

# Serial Devices

options SCIFCN_SPEED=57600
scif0 at shb? port 0xffe80000 irq 12

# SH PCMCIA controllers
#shpcic0 at shb? port 0xb000000a iomem 0xb8000000 iosiz 0x1000000
#shpcic1 at shb? port 0xb000000c iomem 0xb9000000 iosiz 0x1000000

# PCMCIA bus support
#pcmcia* at shpcic? controller ? socket ?

#com* at pcmcia? function ? # Modems and serial cards
#wdc* at pcmcia? function ?
#wd* at wdc? drive ? # the drives themselves

#ep* at pcmcia? function ? # 3Com 3c589 and 3c562 Ethernet
#mbe* at pcmcia? function ? # MB8696x based Ethernet
#ne* at pcmcia? function ? # NE2000-compatible Ethernet
#sm* at pcmcia? function ? # Megahertz Ethernet

#pseudo-device vnd 4 # disk-like interface to files
#pseudo-device bpfilter 8 # Berkeley packet filter
#pseudo-device ipfilter # IP filter (firewall) and NAT
pseudo-device loop # network loopback
pseudo-device pty 16 # pseudo-terminals
#pseudo-device ppp 2 # Point-to-Point Protocol
#pseudo-device tun 2 # network tunneling over tty

# Enable the hooks used for initializing the root memory-disk.
#options MEMORY_DISK_HOOKS
#options MEMORY_DISK_IS_ROOT # force root on memory disk
#options MEMORY_DISK_SERVER=0 # no userspace memory disk support
#options MINIROOTSIZE=3074 # size of memory disk, in blocks

pseudo-device md 1 # memory disk device (ramdisk)