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Booting top-of-tree bcm47xx as nfs-root with cfe only (no sibyl)

To: LMO <>
Subject: Booting top-of-tree bcm47xx as nfs-root with cfe only (no sibyl)
From: "Mark E Mason" <>
Date: Wed, 26 Nov 2008 14:56:11 -0800
Accept-language: en-US
Acceptlanguage: en-US
Cc: "Mark E Mason" <>, "" <>
Original-recipient: rfc822;
Thread-index: AclQGizx3SJWSxkJQ3yAWCaYcK8Cyg==
Thread-topic: Booting top-of-tree bcm47xx as nfs-root with cfe only (no sibyl)
Hello all,

I dug one of my bcm47xx eval boards out of the garage and I've been trying to 
get it to boot using the top-of-tree kernel [with NFS enabled as a non-module], 
with an NFS root mounted filesystem, using CFE only (no sibyl).

I've gotten as far as I have with the following CFE commands:

setenv LINUX_CMDLINE "root=/dev/nfs rw 
ifconfig eth1 -auto
boot -elf

And this is as far as I've gotten ... Something isn't liking the NFS root 
specification. I'll admit that using sibyl on other cfe machines has made me 
lazy. I don't really remember the incantations to get this to work correctly... 
Or is this a kernel config issue?

Thanks in advance,

CFE> setenv LINUX_CMDLINE "root=/dev/nfs rw 
*** command status = 0
CFE> ifconfig eth1 -auto
phy 5, vendor 000895 part 12
mii_probe: Using PHY 5
eth1: Link speed: 100BaseT FDX
Device eth1:  hwaddr 02-90-4C-4F-47-04, ipaddr, mask
        gateway, nameserver, domain
*** command status = 0
CFE> boot -elf
Loader:elf Filesys:tftp Dev:eth1 File: Options:(null)
Loading: 0x80001000/4067462 0x803e2086/245290 Entry at 0x80005590
Closing network.
eth1: 7960 sent, 7968 received, 0 interrupts
Starting program at 0x80005590

Linux version 2.6.28-rc6 (mason@hawaii) (gcc version 3.4.4) #4 Wed Nov 26 
13:59:54 PST 2008
arcs_cmdline='root=/dev/nfs rw nfsroot= 
console=ttyS0,115200'<6>console [early0] enabled
CPU revision is: 00029006 (Broadcom BCM3302)
ssb: Sonics Silicon Backplane found at address 0x18000000
Determined physical RAM map:
 memory: 04000000 @ 00000000 (usable)
Initrd not found or empty - disabling initrd
Zone PFN ranges:
  Normal   0x00000000 -> 0x00004000
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
    0: 0x00000000 -> 0x00004000
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
Kernel command line: root=/dev/nfs rw 
nfsroot= console=ttyS0,115200
Primary instruction cache 16kB, VIPT, 2-way, linesize 16 bytes.
Primary data cache 16kB, 2-way, VIPT, cache aliases, linesize 16 bytes
PID hash table entries: 256 (order: 8, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 60676k/65536k available (3103k kernel code, 4784k reserved, 713k data, 
156k init, 0k highmem)
Calibrating delay loop... 199.16 BogoMIPS (lpj=398336)
Mount-cache hash table entries: 512
Initializing cgroup subsys ns
Initializing cgroup subsys cpuacct
net_namespace: 720 bytes
NET: Registered protocol family 16
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: Fixing up bridge 0000:00:00.0
PCI: Fixing up device 0000:00:00.0
PCI: Fixing latency timer of device 0000:00:00.0 to 168
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
NET: Registered protocol family 1
audit: initializing netlink socket (disabled)
type=2000 audit(0.379:1): initialized
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
msgmni has been set to 118
alg: No test for stdrng (krng)
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
Serial: 8250/16550 driver2 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO 0xb8000300 (irq = 3) is a 16550A
console handover: boot [early0] -> real [ttyS0]
serial8250.0: ttyS1 at MMIO 0xb8000400 (irq = 3) is a 16550A
brd: module loaded
eth0: Broadcom 44xx/47xx 10/100BaseT Ethernet 02:90:4c:4e:47:04
eth1: Broadcom 44xx/47xx 10/100BaseT Ethernet 02:90:4c:4f:47:04
console [netcon0] enabled
netconsole: network logging started
Driver 'sd' needs updating - please use bus_type methods
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
mice: PS/2 mouse device common for all mice
TCP bic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
registered taskstats version 1
VFS: Cannot open root device "nfs" or unknown-block(0,255)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255)

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