I have a strange problem with the uart driver. The 8xx_write in uart.c always fails because copy_from_user returns 0 instead of the requested number of bytes. When I ignore the comparison with the requested number of bytes everything works ok, the correct bytes are transmitted and 8xx_write returns something >0. The next strange thing: a write to a tty file descriptor sometimes returns a negative number, although the output succeded. perror in this case outputs an unknown error. Does anyone know this problems?
Ralf ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
