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Date: Tue, 20 Oct 2009 10:52:00 -0500 From: myuboot@...tmail.fm To: "Florian Fainelli" <florian@...nwrt.org> Cc: linux-kernel@...r.kernel.org, "linux-mips" <linux-mips@...ux-mips.org> Subject: Re: serial port 8250 messed up after coverting from little endian to big endian on kernel 2.6.31 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)); } Thanks. On Tue, 20 Oct 2009 08:17 +0200, "Florian Fainelli" <florian@...nwrt.org> wrote: > Hi, > > Le mardi 20 octobre 2009 01:56:04, myuboot@...tmail.fm 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 > how > you actually write and read characters from the UART FIFO and especially > if > 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 > also > uses a 8250-compatible UART. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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