Re: A PPC kernel issue with UART ??

[Daniel Ann <ktdann@gmail.com>]

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 <johnsoncheng@qnap.com.tw> wrote:
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> Dear All,
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> I meet a wired UART problem on linux-2.6 with MPC8241 chip.
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> My Environment is as following:=20
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> CPU: MPC8241
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> Linux: 2.6.12.3
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> COM1 offset: 0x4500, COM2 offset: 0x4600
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> When I booting my rootfs, it hangs at following message:
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> RAMDISK: Compressed image found at block 0
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> VFS: Mounted root (ext2 filesystem) readonly.
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> Freeing unused kernel memory: 104k init
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> EXT2-fs warning: checktime reached, running e2fsck is recommended
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> I had add printk in tty_write() of drivers/char/tty_io.c, the message fro=
m
> rootfs have printed.
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> The conclusion is that message can be printed by printk() in linux kernel=
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> but can't be printed by printf() in user mode. I think it must be somethi=
ng
> wrong for my UART configurations, does anybody know it??
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> Best Regards,
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> Johnson Cheng
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
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Daniel