MohanReddy koppula wrote: > 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
I suppose the bootloader, i.e u-boot, works well so looks this should not be issued by the cable at least. > 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 Any panic information? Or any dead lock? Which line in detail? > 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? Can the serial driver support the poll mode? If so maybe you can take a try to exclude any interrupt reason. And even you can remove all codes to initialize the corresponding PIN & CLK dedicated to the serial port, then try again since the bootloader already did this. Tiejun > > 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 > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
