Hi,
The linux object did not go very far on my custom board. As soon as it
decompress
itself then it hang silently. The last printout is "Now booting the kernel".
I am trying to understand why printk() did not print out even one character
as this
function is called at very beginning of start_kernel(). I had the following
questions.
1. What does this statement mean in kernel/printk.c ?
__setup("console=", console_setup);
2. How does the underneath driver of printk() is initialized? If printk() is
called before
init_IRQ(). I assume it can only push characters out instead of accepting
input just
like putc() or serial_putc() before uncompessing linux. But after intense
search inside
linux source code, I am still puzzled...
This is the boot log.
Starting at 0x800000...
loaded at: 00800000 0089E1BC
zimage at: 00805870 0089AC70
avail ram: 00400000 00800000
Linux/PPC load:
Uncompressing Linux...done.
Now booting the kernel
Thanks.
Bo
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
What processor are you using?
I have seen this on 8260 processors because the startup code trys to
reconfigure the clocks and subsequently the baud rate generators. Something
like this is the first thing I would check.
-----Original Message-----
From: owner-linuxppc-embedded@lists.linuxppc.org
[mailto:owner-linuxppc-embedded@lists.linuxppc.org]On Behalf Of Yu
Bo-BOYU1
Sent: Monday, November 04, 2002 2:05 PM
To: Linuxppc-Embedded (E-mail)
Subject: printk and
Hi,
The linux object did not go very far on my custom board. As soon as it
decompress
itself then it hang silently. The last printout is "Now booting
the kernel".
I am trying to understand why printk() did not print out even one
character
as this
function is called at very beginning of start_kernel(). I had the
following
questions.
1. What does this statement mean in kernel/printk.c ?
__setup("console=", console_setup);
2. How does the underneath driver of printk() is initialized? If
printk() is
called before
init_IRQ(). I assume it can only push characters out instead of accepting
input just
like putc() or serial_putc() before uncompessing linux. But after intense
search inside
linux source code, I am still puzzled...
This is the boot log.
Starting at 0x800000...
loaded at: 00800000 0089E1BC
zimage at: 00805870 0089AC70
avail ram: 00400000 00800000
Linux/PPC load:
Uncompressing Linux...done.
Now booting the kernel
Thanks.
Bo
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
Hi
U will have to look what parameters u r passing to
kernel. i mean console=ttyS0 , 9600 u have to pass to
kernel. U have to enable support for console on serial
port while configuring the kernel.Now u have to see
that "include/asm/serial.h" ur serial port mapping is
correct or not. I mean u have specified correct io
address or not.
Printk does not need irq. So u do not have to bother
abt irq right now.
Befor setup_console all printk messages will be
bufferd, means they will not come to console. Only
after setup_console is done & uart is mapped properly
u will see all the messages on the console.
May be u will have success but who knows.
thanx
Bhupi
Linux+Hypertransport ---> Silicon
www.gdatech.com
--- acurtis@directvinternet.com wrote:
What processor are you using?
I have seen this on 8260 processors because the
startup code trys to
reconfigure the clocks and subsequently the baud
rate generators. Something
like this is the first thing I would check.
quoted
-----Original Message-----
From: owner-linuxppc-embedded@lists.linuxppc.org
[mailto:owner-linuxppc-embedded@lists.linuxppc.org]On
Behalf Of Yu
quoted
Bo-BOYU1
Sent: Monday, November 04, 2002 2:05 PM
To: Linuxppc-Embedded (E-mail)
Subject: printk and
Hi,
The linux object did not go very far on my custom
board. As soon as it
quoted
decompress
itself then it hang silently. The last printout is
"Now booting
quoted
the kernel".
I am trying to understand why printk() did not
print out even one
quoted
character
as this
function is called at very beginning of
start_kernel(). I had the
quoted
following
questions.
1. What does this statement mean in
kernel/printk.c ?
quoted
__setup("console=", console_setup);
2. How does the underneath driver of printk() is
initialized? If
quoted
printk() is
called before
init_IRQ(). I assume it can only push characters
out instead of accepting
quoted
input just
like putc() or serial_putc() before uncompessing
linux. But after intense
quoted
search inside
linux source code, I am still puzzled...
This is the boot log.
Starting at 0x800000...
loaded at: 00800000 0089E1BC
zimage at: 00805870 0089AC70
avail ram: 00400000 00800000
Linux/PPC load:
Uncompressing Linux...done.
Now booting the kernel
Thanks.
Bo
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/