INIT:

Wed Mar 1 11:41:24 EST 2006

Hi,
I am running u-boot & linux2.6.12 on a custom ppc board(functional HW).  I can get to the point where u-boot loads the kernel, kernel does all the initialization,  loads the Root File System over NFS & calls the Init process.
Next, i am expecting to see a shell prompt. I am not sure where in the Init process i am failing. I have written my own serial driver(Philips SC28L194 Quad UART--under development-possible culprit). The printks work just fine.
All i see is the kernel calling the Init process & after a minute or so i see uart_close call.
The kernel runs just fine & responds to ping.
What can trigger a uart_close??(tty_release calls release_dev calls uart_close) I have a JTAG debugger. What's the best way to debug once Init process is running??

I am attaching a dump of my console:
U-Boot 1.1.3 (Dec 16 2005 - 16:00:23), Build: 0.4.1

SysClock = 120Mhz , TClock = 120Mhz 
CPU:   MPC7447A v1.1 @ 960 MHz
CPU bus mode : 60x

DRAM:  SPD Checksum ok!
-- DIMM1 has 2 banks
-- DIMM2 has 0 banks
ECC Initialization of Bank 0: Done
CAS Latency = 2 tRP = 3 tRAS = 6 tRCD=3
Total SDRAM memory is 1024 MB
Now running in RAM - U-Boot at: 00fc0000
Remapped Internal SRAM to 0xf2000000
Remapped Flash Card to 0xffc00000
FLASH:  4 MB
Addresses 32M - 0M are saved for the U-Boot usage.
Mem malloc Initialization (32M - 16M): Done

Internal SRAM ECC Initialization: Done
***Phy Reset***
Phy Auto-Negotiation Bit ReEnabled in SW
Net:   , mv_enet1 [PRIME]
Hit any key to stop autoboot:  0 
Ethernet status port 1: Link up, Full Duplex, Speed 100 Mbps
Using mv_enet1 device
TFTP from server 192.168.1.1; our IP address is 192.168.1.2
Filename 'uImage'.
Load address: 0x400000
Loading: #################################################################
         #################################################################
         #################################################################
         ########################
done
Bytes transferred = 1119847 (111667 hex)

### Network statistics: ###
--------------------------
 Packets received:              2192
 Packets send:                  2191
 Received bytes:                2347583
 Send bytes:                    100803
## Booting image at 00400000 ...
   Image Name:   Linux-2.6.12
   Created:      2006-02-14   0:37:17 UTC
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1119783 Bytes =  1.1 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
## cmdline at 0x007FFF00 ... 0x007FFF98
memstart    = 0x00000000
memsize     = 0x40000000
flashstart  = 0xFFC00000
flashsize   = 0x00400000
flashoffset = 0x00000000
sramstart   = 0xF8000000
sramsize    = 0x00400000
bootflags   = 0x00000001
intfreq     =    960 MHz
busfreq     =    120 MHz
ethaddr     = 64:00:00:00:00:00
IP addr     = 192.168.1.2
baudrate    = 115200 bps
tclk        =      0 MHz
uboot_ver   = 0.4.1a 
L3 was init = 0
Total memory = 768MB; using 2048kB for hash table (at c0400000)
Linux version 2.6.12 (root at RHEL40) (gcc version 3.3.3 (DENX ELDK 3.1.1 3.3.3-10)) #154 Mon Feb 13 17:36:35 MST 2006
System Identification: 
Freescale 74XX port 
Built 1 zonelists                         
Kernel command line: console=ttyS0,115200 root=/dev/nfs rw nfsroot=192.168.1.1:/target/chestnut/rootfs ip=192.168.1.2:192.168.1.1:192.168.1.1:255.255.255.0:DB64xxx:eth0:non
e
PID hash table entries: 4096 (order: 12, 65536 bytes)
time_init: decrementer frequency = 30.000000 MHz     
Console: colour dummy device 80x25              
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)  
Memory: 774400k available (1596k kernel code, 556k data, 344k init, 0k highmem)
Mount-cache hash table entries: 512                                            
NET: Registered protocol family 16 
PCI: Probing PCI hardware         
JFFS2 version 2.2. (C) 2001-2003 Red Hat, Inc.
Generic RTC Driver v1.07                      
Serial: SC28L194 driver 4 ports
ttyS0 at MMIO 0x0 (irq = 17) is a PHILIPS SC28L194
ttyS1 at MMIO 0x0 (irq = 17) is a PHILIPS SC28L194
ttyS2 at MMIO 0x0 (irq = 17) is a PHILIPS SC28L194
ttyS3 at MMIO 0x0 (irq = 17) is a PHILIPS SC28L194
io scheduler noop registered                      
io scheduler anticipatory registered
io scheduler deadline registered    
io scheduler cfq registered     
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)                                         
MV-643xx 10/100/1000 Ethernet Driver
eth0: port 1 with MAC address 00:11:85:da:0b:02
eth0: RX NAPI Enabled                          
physmap flash device: 400000 at ffc00000
mice: PS/2 mouse device common for all mice
NET: Registered protocol family 2          
IP: routing cache hash table of 8192 buckets, 64Kbytes
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 6, 262144 bytes)         
TCP: Hash tables configured (established 131072 bind 65536)
NET: Registered protocol family 1                          
NET: Registered protocol family 17
IP-Config: Complete:              
      device=eth0, addr=192.168.1.2, mask=255.255.255.0, gw=192.168.1.1,
     host=DB64xxx, domain=, nis-domain=(none),                          
     bootserver=192.168.1.1, rootserver=192.168.1.1, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.1                
Looking up port of RPC 100005/1 on 192.168.1.1
VFS: Mounted root (nfs filesystem).           
Freeing unused kernel memory: 344k init

Any help appreceated.
Thanks
pankaj