Thanks a lot Geert and Benjamin for your response.
Code is indeed calling register_console from three different places
1) con_init()[name-tty],
2) serial8250_console_init()[name-ttyS],
3) early_uart_console_init()[name-uart].
Among these, 8250 must be the active one. Also
serial8250_console_write() keeps hitting the BDI2000 break point with
same address and count again and again.
I am getting garbage on the screen. So, I presume this must be some sort
of baud rate issue. Can some one help me out understand how this baud is
set for serial drivers? I want to run at 115200.
Thanks
Siva
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Geert
Uytterhoeven
Sent: Tuesday, November 13, 2007 12:17 AM
To: Siva Prasad
Cc: linuxppc-dev@ozlabs.org; [EMAIL PROTECTED]
Subject: Re: printk/console_init
On Mon, 12 Nov 2007, Siva Prasad wrote:
I am using 2.6.19 Linux on 8641D based system.
I am using early printk's and it works fine until console_init() is
executed. After that it does not, as the early printk's get disabled,
which is fine. However, I don't see any prints after that at all, that
are based on regular printk statements. I looked directly into the
memory at __log_buf and found all the print messages. It is just not
coming out to the serial port properly.
It would be great if some one can tell me various parameters that I
need
to consider changing, to successfully port the serial driver for a new
board.
Based on the early printk's, I am getting the following messages...
Using MPC86xx HPCN machine description
Total memory = 1024MB; using 2048kB for hash table (at cfe0)
Linux version 2.6.19 ([EMAIL PROTECTED]) (gcc version 4.1.1
20060525 (Red Hat 4.1.1-1)) #115 SMP Mon Nov 12 18:21:43 PST 2007
Found legacy serial port 0 for /[EMAIL PROTECTED]/[EMAIL PROTECTED]
mem=ff704500, taddr=ff704500, irq=1a, clk=1496250, speed=0
Found MPC86xx PCIE host bridge at 0xff708000. Firmware bus
number: 0-254
Found MPC86xx PCIE host bridge at 0xff709000. Firmware bus
number: 0-255
MPC86xx HPCN board from Freescale Semiconductor
Zone PFN ranges:
DMA 0 - 196608
Normal 196608 - 196608
HighMem196608 - 262144
early_node_map[1] active PFN ranges
0:0 - 262144
start_kernel: 8 2200.
Built 1 zonelists. Total pages: 260096
Kernel command line: console=ttyS0,115200 root=/dev/sda8
mpic: Setting up MPIC MPIC version 1.2 at ff74, max 2 CPUs
mpic: ISU size: 16, shift: 4, mask: f
mpic: Initializing for 80 sources
PID hash table entries: 4096 (order: 12, 16384 bytes)
time_init: decrementer frequency = 150.00 MHz
time_init: processor frequency = 1496.25 MHz
Nothing gets printed after this ...
Did your serial driver (a) call register_console() (b) using the correct
name?
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Network and Software Technology Center Europe
The Corporate Village * Da Vincilaan 7-D1 * B-1935 Zaventem * Belgium
Phone:+32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: [EMAIL PROTECTED]
Internet: http://www.sony-europe.com/
Sony Network and Software Technology Center Europe
A division of Sony Service Centre (Europe) N.V.
Registered office: Technologielaan 7 * B-1840 Londerzeel * Belgium
VAT BE 0413.825.160 * RPR Brussels
Fortis Bank Zaventem * Swift GEBABEBB08A * IBAN BE39001382358619
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