cpm_uart console problems?

cpm_uart console problems?

[Tsang, Chi Kit]

Hi,

I am working on an 8260 based board and currently cannot get 
the serial (running on SMC 1) to work using the 2.6.11 kernel. 
The last message I see in my console is: "Now booting the 
kernel".

I currently use NFS root for mounting the root filesystem. 
Despite not seeing any output from the serial console, the 
board does actually boot up and I can telnet in okay. Here is 
what I see in:

/proc/interrupts:

CPU0
4: 0 CPM2 SIU Edge cpm_uart
32: 23184 CPM2 SIU Edge fenet
BAD: 793

/proc/devices:

Character devices:
1 mem
2 pty
3 ttyp
4 /dev/vc/0
4 tty
5 /dev/tty
5 /dev/console
5 /dev/ptmx
7 vcs
10 misc
13 input
128 ptm
136 pts
204 ttyCPM
254 devfs

Block devices:

There are no block devices installed.

In /dev, I see:

crw--w--w- 1 root root 204, 46 Jan 1 00:32 ttyCPM0

And when I do "dmesg", I see:

...
...
Serial: CPM driver $Revision: 0.01 $
ttyCPM0 at MMIO 0xf0011a80 (irq = 4) is a CPM UART
...
...

I currently do not specify the "console=ttyCPM" in my boot command 
line. Would this be an issue?

I have tried to add "console=ttyCPM" to my boot command line but in 
such cases, the kernel would fail to boot. Using some LEDs as debug, 
I tracked down the hang which seems to happen during cpm_uart_console_write.
This is as far as I got.

I am running with devfs enabled in the kernel. Does the cpm_uart 
driver work with devfs?

As an aside, I have ported the 2.6.5 kernel to my 8260 based board and
both ethernet (FCC 1) and serial (SMC 1) worked okay using this particular
kernel.

Any suggestions/ideas would be much appreciated.

Thanks,
Chi

Re: cpm_uart console problems?

[Vitaly Bordug]

Tsang, Chi Kit wrote:

>Hi,
>
>I am working on an 8260 based board and currently cannot get 
>the serial (running on SMC 1) to work using the 2.6.11 kernel. 
>The last message I see in my console is: "Now booting the 
>kernel".
>
>
>
>I currently do not specify the "console=ttyCPM" in my boot command 
>line. Would this be an issue?
>
>  
>
Well, I think so. I don't have 8260 but with similar cpm2 board with
"console=ttyCPM0,115200 " parameter serial console works fine.

>I have tried to add "console=ttyCPM" to my boot command line but in 
>such cases, the kernel would fail to boot. Using some LEDs as debug, 
>I tracked down the hang which seems to happen during cpm_uart_console_write.
>This is as far as I got.
>
>  
>
Because there is no such console device...

>I am running with devfs enabled in the kernel. Does the cpm_uart 
>driver work with devfs?
>
>  
>
Yes, but not very good actually, as far as devfs seems to be
deprecated.  At least on my 8272ADS.

>As an aside, I have ported the 2.6.5 kernel to my 8260 based board and
>both ethernet (FCC 1) and serial (SMC 1) worked okay using this particular
>kernel.
>
>Any suggestions/ideas would be much appreciated.
>
>Thanks,
>Chi
>
>  
>


-- 
Sincerely,
Vitaly

Re: cpm_uart console problems?

[Robert P. J. Day]

On Wed, 13 Apr 2005, Tsang, Chi Kit wrote:

> ttyCPM0 at MMIO 0xf0011a80 (irq = 4) is a CPM UART
> ...
> ...
>
> I currently do not specify the "console=ttyCPM" in my boot command
> line. Would this be an issue?

this may or may not help you but, with my 8xx board, i had to add
"console=ttyCPM0,9600" to my boot command line.

rday