* UART prints very slow
@ 2003-09-30 2:07 Yuxiao Xi
2003-09-30 18:48 ` Mark A. Greer
0 siblings, 1 reply; 2+ messages in thread
From: Yuxiao Xi @ 2003-09-30 2:07 UTC (permalink / raw)
To: linuxppc-embedded
Hello,all,
I am developing my board with CPU MPC8240 and a UART ST16C2552.
I use MontaVista Linux 2.1. Now I have successfully logged in the
shell.But there is a question that I can't resolve:( I am sure that the
UART is successfully initialized except that ST16C2552 is detected as
ST16650.I debugged the UART interrupt and the printk info showed that it
was OK.
QUESTION: when I input commands such as 'ls', 'cd /dev' on the shell,
the characters of these commands are printed very slow on the screen
and the command execution results as well. I think these commands and
their execution results are printed through UART interrupt.Is MPC8240
interrupt ACK so slow? BTW: while system booting,the UART prints very
quickly in polling print mode.
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Yuxiao Xi
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡xiyuxiao@harbournetworks.com
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-09-30
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: UART prints very slow
2003-09-30 2:07 UART prints very slow Yuxiao Xi
@ 2003-09-30 18:48 ` Mark A. Greer
0 siblings, 0 replies; 2+ messages in thread
From: Mark A. Greer @ 2003-09-30 18:48 UTC (permalink / raw)
To: Yuxiao Xi; +Cc: linuxppc-embedded
Interrupt problem. Double check the irq you specified in the uart setup
stuff.
Mark
--
Yuxiao Xi wrote:
>Hello,all,
> I am developing my board with CPU MPC8240 and a UART ST16C2552.
>I use MontaVista Linux 2.1. Now I have successfully logged in the
>shell.But there is a question that I can't resolve:( I am sure that the
>UART is successfully initialized except that ST16C2552 is detected as
>ST16650.I debugged the UART interrupt and the printk info showed that it
>was OK.
>
>QUESTION: when I input commands such as 'ls', 'cd /dev' on the shell,
>the characters of these commands are printed very slow on the screen
>and the command execution results as well. I think these commands and
>their execution results are printed through UART interrupt.Is MPC8240
>interrupt ACK so slow? BTW: while system booting,the UART prints very
>quickly in polling print mode.
>
>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Yuxiao Xi
>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡xiyuxiao@harbournetworks.com
>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-09-30
>
>
>
>
>
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
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