Messages in this thread | | | Date | Tue, 05 Aug 2008 23:21:18 +0200 | From | Jiri Slaby <> | Subject | Re: Simple UART driver help and TTY questions |
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On 08/05/2008 06:33 PM, Ira Snyder wrote: > Hello LKML, > So, the problem I have is that when I install this driver, it seems to > return -EIO before it even hits any of the driver code. I checked this > by putting a printk at the beginning of every function call in the > module. > > The error from busybox microcom is this: > microcom: can't tcsetattr for /dev/ttytiny0: Input/output error > > And cat /dev/ttytiny0: > cat: /dev/ttytiny0: Input/output error > > Previously to finding this code from LinuxJournal, I had tried to write > my own skeleton driver, basing it on the drivers/serial/ucc_uart.c code. > It has the exact same problem. I've attached it as well. > > So, to the best of my research, it seems like the tcsetattr call would > come in at drivers/char/tty_ioctl.c in tty_mode_ioctl() (the TCSETS > case). Maybe I'm wrong, though. > > I've built it against both ubuntu's stock kernel (2.6.24 based) and a > recent pull of the kernel.org kernel. > > I'd really appreciate help figuring out what this problem is.
Attach straces of your tries.
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