about serial console problem

about serial console problem

[Barry Wu]

Hi, all,

I am porting linux 2.4.3 to our mipsel evaluation
board. Now I meet a problem. Because I use edown
to download the linux kernel to evaluation board.
I update the serial baud rate to 115200.
I use serial 0 as our console, and I can use
printk to print debug messages on serial port.
But after kernel call /sbin/init, I can not
see "INIT ...  ..." messages on serial port.
I suppose perhaps I make some mistakes. But when
I use 2.2.12 kernel, it ok.
If someone knows, please help me. Thanks!

Barry

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Re: about serial console problem

[Keith Owens]

On Sun, 22 Jul 2001 23:51:25 -0700 (PDT), 
Barry Wu <wqb123@yahoo.com> wrote:
>I am porting linux 2.4.3 to our mipsel evaluation
>board. Now I meet a problem. Because I use edown
>to download the linux kernel to evaluation board.
>I update the serial baud rate to 115200.
>I use serial 0 as our console, and I can use
>printk to print debug messages on serial port.
>But after kernel call /sbin/init, I can not
>see "INIT ...  ..." messages on serial port.

Probably you did not code the console boot parameters correctly.  In
LILO, append="console=tty0 console=ttyS0,115200".  printk is written to
all consoles, init messages are only written to the last console
specified.

Re: about serial console problem

[Marc Karasek]

This sounds like a problem I ran into on another processor/platform.
What are you using for a ramdisk?  Is it busybox?  There was a bug in
0.51 busybox that would not let it accept input from a console on a
serial port.  It had to do with the init for the serial port.  You can
check the patch file below to see the problem that was in busybox...

--- init.c.orig Sat Apr 21 17:46:57 2001
+++ init.c      Sat Apr 21 17:46:31 2001
@@ -276,7 +276,7 @@

        /* Make it be sane */
        tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
-       tty.c_cflag |= HUPCL|CLOCAL;
+       tty.c_cflag |= CREAD|HUPCL|CLOCAL;

        /* input modes */
        tty.c_iflag = ICRNL | IXON | IXOFF;

On 22 Jul 2001 23:51:25 -0700, Barry Wu wrote:
> 
> Hi, all,
> 
> I am porting linux 2.4.3 to our mipsel evaluation
> board. Now I meet a problem. Because I use edown
> to download the linux kernel to evaluation board.
> I update the serial baud rate to 115200.
> I use serial 0 as our console, and I can use
> printk to print debug messages on serial port.
> But after kernel call /sbin/init, I can not
> see "INIT ...  ..." messages on serial port.
> I suppose perhaps I make some mistakes. But when
> I use 2.2.12 kernel, it ok.
> If someone knows, please help me. Thanks!
> 
> Barry
> 
> __________________________________________________
> Do You Yahoo!?
> Make international calls for as low as $.04/minute with Yahoo! Messenger
> http://phonecard.yahoo.com/
--
/*************************
Marc Karasek
Sr. Firmware Engineer
iVivity Inc.
marc_karasek@ivivity.com
(770) 986-8925
(770) 986-8926 Fax
*************************/

Re: about serial console problem

[Dave Airlie]

Cool, this patch fixed a problem we were seeing with busybox on the
Linux/VAX project, that I hadn't time to look at...

thanks

Dave.


On 23 Jul 2001, Marc Karasek wrote:

> This sounds like a problem I ran into on another processor/platform.
> What are you using for a ramdisk?  Is it busybox?  There was a bug in
> 0.51 busybox that would not let it accept input from a console on a
> serial port.  It had to do with the init for the serial port.  You can
> check the patch file below to see the problem that was in busybox...
>
> --- init.c.orig Sat Apr 21 17:46:57 2001
> +++ init.c      Sat Apr 21 17:46:31 2001
> @@ -276,7 +276,7 @@
>
>         /* Make it be sane */
>         tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
> -       tty.c_cflag |= HUPCL|CLOCAL;
> +       tty.c_cflag |= CREAD|HUPCL|CLOCAL;
>
>         /* input modes */
>         tty.c_iflag = ICRNL | IXON | IXOFF;
>
> On 22 Jul 2001 23:51:25 -0700, Barry Wu wrote:
> >
> > Hi, all,
> >
> > I am porting linux 2.4.3 to our mipsel evaluation
> > board. Now I meet a problem. Because I use edown
> > to download the linux kernel to evaluation board.
> > I update the serial baud rate to 115200.
> > I use serial 0 as our console, and I can use
> > printk to print debug messages on serial port.
> > But after kernel call /sbin/init, I can not
> > see "INIT ...  ..." messages on serial port.
> > I suppose perhaps I make some mistakes. But when
> > I use 2.2.12 kernel, it ok.
> > If someone knows, please help me. Thanks!
> >
> > Barry
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Make international calls for as low as $.04/minute with Yahoo! Messenger
> > http://phonecard.yahoo.com/
> --
> /*************************
> Marc Karasek
> Sr. Firmware Engineer
> iVivity Inc.
> marc_karasek@ivivity.com
> (770) 986-8925
> (770) 986-8926 Fax
> *************************/
>
>

-- 
David Airlie, Software Engineer
http://www.skynet.ie/~airlied / airlied@skynet.ie
pam_smb / Linux DecStation / Linux VAX / ILUG person

Re: about serial console problem

[Dave Airlie]

Cool, this patch fixed a problem we were seeing with busybox on the
Linux/VAX project, that I hadn't time to look at...

thanks

Dave.


On 23 Jul 2001, Marc Karasek wrote:

> This sounds like a problem I ran into on another processor/platform.
> What are you using for a ramdisk?  Is it busybox?  There was a bug in
> 0.51 busybox that would not let it accept input from a console on a
> serial port.  It had to do with the init for the serial port.  You can
> check the patch file below to see the problem that was in busybox...
>
> --- init.c.orig Sat Apr 21 17:46:57 2001
> +++ init.c      Sat Apr 21 17:46:31 2001
> @@ -276,7 +276,7 @@
>
>         /* Make it be sane */
>         tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
> -       tty.c_cflag |= HUPCL|CLOCAL;
> +       tty.c_cflag |= CREAD|HUPCL|CLOCAL;
>
>         /* input modes */
>         tty.c_iflag = ICRNL | IXON | IXOFF;
>
> On 22 Jul 2001 23:51:25 -0700, Barry Wu wrote:
> >
> > Hi, all,
> >
> > I am porting linux 2.4.3 to our mipsel evaluation
> > board. Now I meet a problem. Because I use edown
> > to download the linux kernel to evaluation board.
> > I update the serial baud rate to 115200.
> > I use serial 0 as our console, and I can use
> > printk to print debug messages on serial port.
> > But after kernel call /sbin/init, I can not
> > see "INIT ...  ..." messages on serial port.
> > I suppose perhaps I make some mistakes. But when
> > I use 2.2.12 kernel, it ok.
> > If someone knows, please help me. Thanks!
> >
> > Barry
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Make international calls for as low as $.04/minute with Yahoo! Messenger
> > http://phonecard.yahoo.com/
> --
> /*************************
> Marc Karasek
> Sr. Firmware Engineer
> iVivity Inc.
> marc_karasek@ivivity.com
> (770) 986-8925
> (770) 986-8926 Fax
> *************************/
>
>

-- 
David Airlie, Software Engineer
http://www.skynet.ie/~airlied / airlied@skynet.ie
pam_smb / Linux DecStation / Linux VAX / ILUG person