Problem with Xilinx Uart Lite

Problem with Xilinx Uart Lite

[Qichen Huang]

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Hi all,

I'm trying to port linuxppc_2_4_devel to Xilinx ML403. I want to use
UartLite instead of Uart 16550. What changes should I do?

I have disabled "Standard/generic (8250/16550 and compatible UARTs) serial
support"
and enabled "Xilinx UART Lite" & "Console on UART Lite port" in character
devices.
And the initial kernel command string is changed to "console=ttl0
console=ttyS0,9600 ip=off root=/dev/xsysace/disc0/part3 rw".

The kernel boot log dosen't mention any serial device and it hangs up until
"System started." There is no login prompt.

My /etc/inittab is :

::sysinit:/etc/init.d/rcS
#::askfirst:-/bin/sh
::ctrlaltdel:/sbin/reboot
::shutdown:/sbin/swapoff -a
::shutdown:/bin/umount -a -r
::restart:/sbin/init
::respawn:/sbin/getty 9600 tts/0


What else should I do?
Thank you!

Qichen

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Re: Problem with Xilinx Uart Lite

[Andrei Konovalov]

Qichen Huang wrote:
> Hi all,
> 
> I'm trying to port linuxppc_2_4_devel to Xilinx ML403. I want to use 
> UartLite instead of Uart 16550. What changes should I do?
> 
> I have disabled "Standard/generic (8250/16550 and compatible UARTs) 
> serial support"
> and enabled "Xilinx UART Lite" & "Console on UART Lite port" in 
> character devices.
> And the initial kernel command string is changed to "console=ttl0 
> console=ttyS0,9600 ip=off root=/dev/xsysace/disc0/part3 rw".

This command line sets default console to ttyS0.
Please remove "console=ttyS0,9600".

> The kernel boot log dosen't mention any serial device and it hangs up 
> until "System started." There is no login prompt.

Are you using the correct xparameters_*.h - the one having the
#defines for UartLite?

> My /etc/inittab is :
> 
> ::sysinit:/etc/init.d/rcS
> #::askfirst:-/bin/sh
> ::ctrlaltdel:/sbin/reboot
> ::shutdown:/sbin/swapoff -a
> ::shutdown:/bin/umount -a -r
> ::restart:/sbin/init
> ::respawn:/sbin/getty 9600 tts/0
> 
> 
> What else should I do?
> Thank you!
> 
> Qichen
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded

Re: Problem with Xilinx Uart Lite

[Qichen Huang]

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Hello Andrei,

Thank you. I have tried this patch, but without luck, the system can not
start, there's no login prompt.
Boot stopps after starting system.
The boot log looks like this:

loaded at: 00400000 004C51E0
board data at: 004C2138 004C2150
relocated to: 0040530C 00405324
zimage at: 00405811 004C1A00
avail ram: 004C6000 04000000

Linux/PPC load: console=ttl0 ip=off root=/dev/xsysace/disc0/part3 rw
Uncompressing Linux...done.
Now booting the kernel
......

Welcome to ML300 powerpc linux 2.4.21, E.I.S. edition

Starting system...
mounting /proc: done.
Mounting '/' read-write: mount: Cannot read /etc/mtab: No such file or
directory

done.
brining up loopback interface: done.
Setup IP-address for eth0: done.
Mounting /tmp: done.
Starting syslogd: done.
Starting klogd: done.
Starting


Thanks,
Qichen

ps. Sorry, I forgot to post this to the mailing list.


On 6/30/06, Andrei Konovalov <akonovalov@ru.mvista.com> wrote:
>
> Seeing a lot of ^M (LF) characters in the end of lines makes me think
> you are using [Win]DOS.
> This makes the patch to look somewhat funny - some of the lines terminated
> with
> <CR> only ("Unix style"), some - with <CR><LF> ("DOS style").
>
> Please try the attached patch. It should help.
>
> Thanks,
> Andrei
>
> Qichen Huang wrote:
> > Hello,
> >
> > attached is my xuartlite_serial.c
> >
> > Thanks,
> > Qichen
> >
> > On 6/30/06, *Andrei Konovalov* <akonovalov@ru.mvista.com
> > <mailto:akonovalov@ru.mvista.com>> wrote:
> >
> >      > Xilinx OS Independent Code XAssert: xuartlite.c:194
> >      > Code may crash due to unhandled errors.
> >
> >     So this is inside XUartLite_Send().
> >     Could you send me your xuartlite_serial.c?
> >     Seems yours doesn't have one of the fixes.
> >
> >     Thanks,
> >     Andrei
>
>
>

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