I happen to use the same code from ar7. So this part
serial_int/serial_out should be fine?
#define PORT(offset) (KSEG1ADDR(MY_MIPSBOARD_REGS_UART0 + (offset * 4)))
static inline unsigned int serial_in(int offset)
return readl((void *)PORT(offset));
static inline void serial_out(int offset, int value)
writel(value, (void *)PORT(offset));
On Tue, 20 Oct 2009 08:17 +0200, "Florian Fainelli"
> Le mardi 20 octobre 2009 01:56:04, email@example.com a écrit :
> > I am trying to bringup a MIPS32 board using 2.6.31. It is working in
> > little endian mode. After changing the board's hardware from little
> > endian to bit endian, the serial port print messed up. It prints now
> > something like - "àààààààààààààààà" on the screen. When I trace the
> > execution, I can see the string the kernel is trying print is correct -
> > "Linux version 2.6.31 ..." and etc.
> > I guess it means the initialization of the serial port is not properly
> > done. But I am not sure where I should check for the problem. The serial
> > port device I am using is 8250. Please give me some advise.
> If the same initialization routine used to work in little-endian, check
> you actually write and read characters from the UART FIFO and especially
> your hardware requires you to do word or byte access to these registers.
> You can have a look at AR7, which has the same code working for Little
> and Big
> Endian modes in arch/mips/ar7/prom.c lines 272 to the end of the file. It
> uses a 8250-compatible UART.