RE: No ttyS device at I/O port 0xfe004500 for console

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On Jun 13, 2006, at 11:48 AM, Alex Zeffertt wrote:

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Hi list,

I'm trying to boot a linux-2.6.11 kernel on a MPC83xx based 

board.   

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Through
some experimentation I have found I need 

"console=uart,io,0xfe004500"

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in the kernel command line in order to get any output over 

the serial 

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port.

Half way through initialisation the kernel appears to swap from its 
"early"
8250 serial driver to a "full" 8250 serial driver.  At this 

point it 

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prints "No ttyS device at I/O port 0xfe004500 for console" 

and there 

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is no further output.

Does anyone have any idea what I may be doing wrong?

BTW, here's the output that I do get.

Alex, where did you get this 2.6.11 kernel?  The public tree 
didn't have support for 83xx in 2.6.11.  I'd suggest looking 
at using something newer like 2.6.16 and see if you have the 
same issue.

I suspect he got from the same place I did, freescales LTIB dev. env.
which has been patched to support 832x. I am having the same problem as he
has, any info on what the problem might be would be great.

Also, if anyone has any info on when these patches will be sent upstream, I 
sure would like to hear about it.

 Jocke

Hi Joakim,

Same here -- go into arch/ppc/platforms/83xx and edit file mpc83xx_sys.c.
If you are using the 8323e cpu, then you need to make sure that file has
code to support the 8323E.  Mine didn't, so I got no platform devices 
initialized (no serial port, no Eth devs).  I added a block of code to support
the 8323E (set mask to 0xffff0000 and "value" to 0x80620000, then the 
device list for the 8323E).  Use existing code there as a guide, it was not
difficult once I figured out that this was the problem.

If you are using a newer LTIB release than me, perhaps yours is fixed.
The one I have is from 3/15/06.

Anyway, this works fine for me and addresses the problem of the platform
devs not getting initialized.

Chuck