RE: A PPC kernel issue with UART ??

Actually, I had reviews all article about "serial console", just know I have
to use LEVEL for interrupt, not EDGE. Unfortunately the default interrupt
setting for kernel is with LEVEL, IRQ_SENSE_LEVEL, I think I don't need to
modify it.
But I found I add ASYNC_SKIP_TEST flag to UART in sandpoint.h can fix my
problem.

Thanks,
Johnson Cheng

-----Original Message-----
From: linuxppc-embedded-bounces@ozlabs.org
[mailto:linuxppc-embedded-bounces@ozlabs.org] On Behalf Of Daniel Ann
Sent: Wednesday, August 03, 2005 8:22 AM
To: JohnsonCheng
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: A PPC kernel issue with UART ??

Johnson,

You know what? I've had the exact same problem only day or two ago. I
think the mail subject was "serial console" or something similar. Have
a read at it.

BTW, My problem was with interrupt setting.
Daniel.

On 8/2/05, JohnsonCheng [off-list ref] wrote:

Dear All,

 

I meet a wired UART problem on linux-2.6 with MPC8241 chip.

 

My Environment is as following: 

CPU: MPC8241

Linux: 2.6.12.3

COM1 offset: 0x4500, COM2 offset: 0x4600

 

When I booting my rootfs, it hangs at following message:

RAMDISK: Compressed image found at block 0

VFS: Mounted root (ext2 filesystem) readonly.

Freeing unused kernel memory: 104k init

EXT2-fs warning: checktime reached, running e2fsck is recommended

 

I had add printk in tty_write() of drivers/char/tty_io.c, the message from
rootfs have printed.

The conclusion is that message can be printed by printk() in linux kernel,
but can't be printed by printf() in user mode. I think it must be

something

wrong for my UART configurations, does anybody know it??

 

 

Best Regards,

Johnson Cheng
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-- 
Daniel
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