But, if there is any problem with cable I could not have seen any character in the interrupt routine of the driver. I turned off both software and hardware flow control as by board doesn't have hardware flow control. tty_read is called and it hangs at ldisc->read. And I see that data is put into the tty buffer by the driver. Will there be any problem with copy_to_user() if there is some problem in the memory?
Thanks, Mohan On Tue, Jan 18, 2011 at 12:55 PM, Nicholas Mc Guire <der.h...@hofr.at> wrote: > On Tue, 18 Jan 2011, MohanReddy koppula wrote: > >> Hi All, >> >> I am working on an MPC885 based custom board. I am able to boot up the >> linux (linux-2.6.33.7). I could see busybox shell (ash) prompt. But it >> is not accepting any inputs, I am not able to enter any command, it >> just hangs there. I am using ttyCPM0 terminal. >> >> I suspected if there was any problem in CPM driver interrupts >> generation and put some printk's in the interrupt handler and could >> see interrupts are raised and data is read, but shell is not taking >> the input. >> >> I wrote an init.c and opened the ttyCPM0 and tried to read from it, >> but couldn't. I am able to write to ttyCPM0 and see it on the host >> minicom. >> > if you are using minicom to connect check if you have hardware/software flow > control turned on - it also could be a cabling problem - had this with the > beagle board where the tx line was on the wrong pin - so I got output but > could not get any response to input. > > hofrat > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
