UART prints very slow
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
����������������[email protected]
��������������������2003-09-30
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
Interrupt problem. Double check the irq you specified in the uart setup stuff.
Mark
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Quoted 15 lines · Yuxiao Xi
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.
Quoted 9 lines
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Yuxiao Xi
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡[email protected]
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-09-30
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/