RE: Linux boot failed on Sandpoint under baudrate 38400

-----Original Message-----
From: owner-linuxppc-embedded@lists.linuxppc.org
[mailto:owner-linuxppc-embedded@lists.linuxppc.org]On Behalf Of
Mark A. Greer
Sent: Friday, October 06, 2000 7:07 AM
To: Zhaobin Zhu
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: Linux boot failed on Sandpoint under baudrate 38400



Zhaobin Zhu wrote:

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"Mark A. Greer" wrote:

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What do you mean by garbled?  Do you mean the characters look

okay but some

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seem to be missing or just a bunch of strange characters?

 a bunch of strange characters.

Okay, then its likely a simple baud rate issue.

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The kernel, the bootloader, and DINK all need to be set up

for the same baud

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rate.  It sounds like you have dink and the bootloader setup

for one baud rate

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and the kernel is probably still at 9600.  Could that be the case?

Mark

Yes, I set bootloader(arch/ppc/boot/ns16550.c)  and DINK (sb -k

38400) to 38400.

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So where do I change the baud rate for kernel ?

Take a look in include/asm-ppc/serial.h at the define of
BASE_BAUD and it's use in
STD_SERIAL_PORT_DEFNS.

Isn't it for the clock divisor?  What happen if I want to return to 9600 baud?

How about changing  the line
"serial_driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;" to
"serial_driver.init_termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;"
in rs_int() for the serial device and
"int baud = 9600;" to "int baud = 38400;" in serial_console_setup() for the console.

Both in drivers/char/serial.c

Stephan Kim

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