linux-2.6.20 cpc700/16550A serial conole problem

Suresh Chandra Mannava boardbringup at
Sun Jan 21 02:57:51 EST 2007

Hi All,
I am working on porting linux-2.6.20-rc2 (DENX) kernel to our board. It 
consists of powerpc MPC7410, IBM CPC700 system controller and couple of AMD 
79C972 network chips.
I am using gcc version 4.0.0 (DENX ELDK 4.0 4.0.0) cross compiler for this 
I followed IBM spruce which consists of CPC700. CPC700 serial port is 16550 
I can see printk's  on serial console till "Freeing unused kernel memory", 
this happens before starting of init.
I enabled debug statements in 8250.c and found some messages like 
serial8250_interrupt(3)...end and kernel freezes ( I attached serial console 
messages). ttyS0 is using interrupt 3.

I assume it is not a tool chain or ramdisk problem problem because I ported 
linux-2.4 (DENX) with the same tool chain and ramdisk image.
Serial console is working fine in linux-2.4.

I request you to provide some pointers for the same.

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