On Tue, 27 Oct 2009 15:40:13 -0500 myuboot@xxxxxxxxxxx wrote: > Thanks, Florian. I found the cause of the problem. My board is 32 bit > based, so each serial port register is 32bit even only 8 bit is used. So > when the board is switched endianess, I need to change the address > offset to access the same registers. > For example, original RHR register address is 0x8001000 with little > endian mode. With big endian, I need to access it as 0x8001003. I assume your uart_port's iotype is defined as UPIO_MEM32. UPIO_MEM32 makes 8250 access serial registers using readl/writel (which might be a problem for big-endian), while UPIO_MEM makes 8250 access the registers using readb/writeb. Maybe you should try UPIO_MEM (assuming hardware allows byte access). -- Shmulik Ladkani Jungo Ltd.
