On Fri, May 27, 2011 at 12:26:20PM +0500, Muhammad Waseem wrote:

I have developed a simple polling based serial device driver for PC's serial
port (COM1: 0x3F8) which works fine. Now I want to implement the same on
UART # 1 of PPC440EPx (Sequoia board).

By changing the base address 0x3F8 to UART# 1 base address (0xEF600400) in
Sequoia it does not work and return all the registers contents
from 0xEF600400 to 0xEF600407 as 0xFF.

Whereas existing ttyS1 driver works for UART# 1.

How can I access the UART# 1 registers in a custom serial driver under
kernel space.

If you post your driver code, we can review it.

josh