Linksys NSLU2 attempt

Tue May 27 20:19:20 UTC 2008

Hi,

I tried booting a FreeBSD/arm kernel (from 7.0-RELEASE sources) on a 
friend's NSLU2.
We appear to have drivers for everything except the Intersil X1205 
real-time clock on iic0.

No dice yet.  Configs attached.

The RedBoot implementation on this board is somewhat cut down. 
"ip_address -b" and "fconfig" commands are not supported, so assigning 
an IP has to be done manually.
IP addresses therefore need manual config, I suggest putting an alias of 
192.168.0.2/24 on your development machine. Also, the ROM+RAM build is 
in use, so RedBoot will relocate itself into low memory on boot.

RedBoot wants ELF kernels, it doesn't need the kernel.bin magic from the 
ldscript:

RedBoot> load -h 192.168.0.2 /kernel.bin
Using default protocol (TFTP)
Unrecognized image type: 0xe28f7028

It also needs to be told that the ELF kernel it is loading needs to be 
loaded at a physical address:

RedBoot> load -h 192.168.0.2 /kernel
Using default protocol (TFTP)
*** Abort! Attempt to load ELF data to address: 0xc02000b4 which is not 
in RAM
RedBoot> load -h 192.168.0.2 -b 0x00200000 /kernel
Using default protocol (TFTP)
Address offset = 0x40000000
Entry point: 0x00200100, address range: 0x00200000-0x004e7c98

Try running:

RedBoot> exec
Using base address 0x00200000 and length 0x002e7c98

..And off into space it goes. Nothing further.

I have no ARM experience so I have no idea where to begin. "exec" turns 
off the MMU before entry.

-------------- next part --------------
# NSLU2 -- Linksys NSLU-2 Network Storage Link for USB 2.0 Disk Drives
# kernel configuration file for FreeBSD/arm
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
#    http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the ../../conf/NOTES and NOTES files. 
# If you are in doubt as to the purpose or necessity of a line, check first 
# in NOTES.
#
# $FreeBSD$

# TODO: RedBoot support.
# TODO: Getting the ethernet addresses out of the RedBoot config area.
# TODO: RTL8201CP PHY driver.
# TODO: Intel NOR flash (probably already handled by IXP BSP)
# TODO: GPIO LEDs (4 of them; plus power LED, power switch, reset switch,
#       and buzzer) see include/asm-arm/arch-ixp4xx/nslu2.h in Linux 2.6
#       for GPIO pin assignments.
# XXX The PCI controller's IRQ lines most likely need remapping
#     on this platform.
# TODO: Intersil X1205 RTC+SRAM chip at iic0.
#       Linux patch at: http://lwn.net/Articles/189262/

machine		arm
ident		NSLU2

options 	PHYSADDR=0x00000000		# RedBoot @ 0x01ff3000?
options		KERNPHYSADDR=0x00200000		# 2MB in
options		KERNVIRTADDR=0xc0200000		# Used in ldscript.arm

# XXX We won't run off flash just yet, and we need to do whatever
# is needed for RedBoot.
#options		FLASHADDR=0x50000000		# 64 blocks 0x20000 each
#options		LOADERRAMADDR=0x00000000

options		STARTUP_PAGETABLE_ADDR=0x00000000

# XXX Currently this file depends on the IXP425 specific
# BSP stuff in the avila_machdep.c file.
# That will have to change however...
include		"../xscale/ixp425/std.avila"

#To statically compile in device wiring instead of /boot/device.hints
hints		"NSLU2.hints"

makeoptions	DEBUG=-g		#Build kernel with gdb(1) debug symbols
makeoptions	CONF_CFLAGS=-mcpu=xscale
options		HZ=100
options		DEVICE_POLLING

options		KDB
options 	DDB			#Enable the kernel debugger
#options		GDB

#options 	INVARIANTS		#Enable calls of extra sanity checking
#options 	INVARIANT_SUPPORT	#Extra sanity checks of internal structures, required by INVARIANTS
#options 	WITNESS			#Enable checks to detect deadlocks and cycles
#options 	WITNESS_SKIPSPIN	#Don't run witness on spinlocks for speed
#options		DIAGNOSTIC

options 	SCHED_4BSD		#4BSD scheduler
options		KSE
options 	INET			#InterNETworking
options 	INET6			#IPv6 communications protocols
options 	FFS			#Berkeley Fast Filesystem
options 	SOFTUPDATES		#Enable FFS soft updates support
options 	UFS_ACL			#Support for access control lists
options 	UFS_DIRHASH		#Improve performance on big directories
options 	NFSCLIENT		#Network Filesystem Client
options 	NFSSERVER		#Network Filesystem Server
options 	NFS_ROOT		#NFS usable as /, requires NFSCLIENT
options 	CD9660			#ISO 9660 Filesystem
options 	PSEUDOFS		#Pseudo-filesystem framework
options 	SCSI_DELAY=5000		#Delay (in ms) before probing SCSI
options 	KTRACE			#ktrace(1) support
options 	SYSVSHM			#SYSV-style shared memory
options 	SYSVMSG			#SYSV-style message queues
options 	SYSVSEM			#SYSV-style semaphores
options 	_KPOSIX_PRIORITY_SCHEDULING #Posix P1003_1B real-time extensions
options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev

options		BOOTP
options		BOOTP_NFSROOT
options		BOOTP_NFSV3
options		BOOTP_WIRED_TO=npe0
options		BOOTP_COMPAT

options		VERBOSE_SYSINIT

device		genclock
device		nexus
device		mem			# Memory and kernel memory devices
device		md
device		random

device		pci
device		uart

# I2C Bus
device		iicbus
device		iicbb
device		iic

device		ixpiic
device		ixpwdog		# watchdog timer

device		npe		# Network Processing Engine
device		npe_fw
device		firmware
device		qmgr		# Q Manager (required by npe)
device		miibus		# NB: required by npe

device		ether
device		bpf

device		pty
device		loop

options		XSCALE_CACHE_READ_WRITE_ALLOCATE
#options		ARM_USE_SMALL_ALLOC

# Onboard USB provided by 1x NEC uPD720101 in FBGA form factor on pci0.
device		usb
options 	USB_DEBUG
device		ohci
device		ehci
-------------- next part --------------
# $FreeBSD$

#
# Device wiring for the Linksys NSLU2.
#
# 32MB SDRAM onboard.
#

# DBGU is unit 0
hint.uart.0.at="ixp0"
hint.uart.0.addr=0xc8000000
hint.uart.0.irq=15
hint.uart.0.flags=0x10

# USART0 is unit 1
hint.uart.1.at="ixp0"
hint.uart.1.addr=0xc8001000
hint.uart.1.irq=13

# NPE Hardware Queue Manager
hint.ixpqmgr.0.at="ixp0"

# Only NPE-B at PHY 0 is attached on the NSLU2.
hint.npe.0.at="ixp0"