Problem with Busybox shell

MohanReddy koppula mohanreddykv at
Wed Jan 19 16:06:04 EST 2011

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


On Tue, Jan 18, 2011 at 12:55 PM, Nicholas Mc Guire <der.herr 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- 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

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