RE: ep8260 board linux port serial port problem

Hello All,

  I am trying to port linux2.4.22 on to ep8260 board. U-boot tftps the image
and then starts loading linux.
the last few lines on the console show this

RAMDISK driver initialized: 16 RAM disks of 50000K size 1024 blocksize
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 2048 buckets, 16Kbytes
TCP: Hash tables configured (established 16384 bind 16384)
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 1367k freed
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 44k init

tty_io.c: process 1 (swapper) used obsolete /dev/ttyS0 - update software to
use
/dev/ttyS0



    after this somewhere down the line the CPU gets an exception and
spinning in the panic function,(i know it is too little of information
but..) could someone  suggest what could  be happening here, could it be
related to the last message on the console, any sugestions would be greatley
appreciated.



thanks,
kiran

-----Original Message-----
From: Kiran Mandava [mailto:kiran.mandava@skystream.com]
Sent: Tuesday, December 30, 2003 9:11 AM
To: linuxppc-embedded@lists.linuxppc.org
Subject: ep8260 board linux port serial port problem



Hello All,

I am trying to bringup linux 2.4.22 on ep8260 board. i have the
U-boot running fine. while booting the linux kernel the
execution path is
looping in serial_console_write(verified it thr'u JTAG).SMC1
is configured
as the console.

     For the SMC port the code is setting up the proper Rx/Tx
descriptors
in the on chip DPRAM and it tries to use the actual buffers
from the RAM (on
the 6xx bus in this case) the code loops in the
serial_console_write, but if
i change the actual buffers to be from the on chip DPRAM
itself the serial
port works fine.(I guess this is how it is done in the U-boot too)..did
someone face the similar probelm, any sugestions would be greately
appreciated.

     RAM seems to be working fine, as the code gets relocated
properly to
RAM and executes from there.




thanks
kiran

quoted

-----Original Message-----
From: Kiran Mandava [mailto:kiran.mandava@skystream.com]
Sent: Thursday, December 18, 2003 11:44 AM
To: linuxppc-embedded@lists.linuxppc.org
Subject: ep8260 board linux port



Hello All,

 I am trying to port linux 2.4.22 onto ep8260 board. (256 MB
RAM on 6xx
bus/ 32 MB Flash) using tools and source code from denx webisite.
 I was able to port u-boot and trying to boot linux now.
 i couldn't find any specific files to this board in the
platform directory
although est8260.h file has the basic bd structure. the
problem i am facing
is the processor loops in serial_console_write/ timer
interrupt handler. i
made sure that i am passing the baudrate proeprly by looking at the bd
structure while passing teh control to start_kernel function.
 My console does display everything properly running u-boot
but once the
control goes to linux don't see anything on the console.

i made only the following changes for th elinux boot.
1. in uart.c made sure that the console port is defines as SMC1.
2. defines the SMC2 to be serial port too
     3. FCC3 is configured as the ethernet.

and compiled and tried to boot the image, but i couldn't. i do
have a BDI
JTAG device and i was able to see the RAM properly.

could some one throw light on what i could be doing wrong,
any sugestions
are greatley appreciated. I bet some one would have done this
sucessfully
years before..




thanks,
kiran

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