using devc-serppc8260 on a PPC 8250

Has anyone used the devc-serppc8260 driver for serial communication on an
PPC 8250 processor?
On the board we are using we have used devc-serppc8260 with an PPC 8266 and
it works fine.
When we change to PPC 8250 we cannot write to /dev/ser1 anymore but it is
still possible to read.

Any clue?

Regards, Mats P