I develop a ECP device and a software driver for windows 98.
I recompile it under linux using the iopl(3) function for unlock the hardware resource.
I used it under a very old Red Hat distribution and it's run correctly.
Under a Red Hat 6.5 distribution or under Mandrake 8.0 it have some problem.
The device transfer a image of 100K via ECP. With new distribuitin there are some byte wrong
(I use a internal CRC that fail).
In the "driver" (it isn't a real linux driver....) there is a internal cicle that's load 16 byte from ECP buffer if it's full. If I insert here a "if" istruction (ex. if(0) printf ("111")) the error on image are more big ( about 10 times more).
I suppose that something in linux kernel read ECP during image transfer. I recomplite it without ECP support but the resoult is the same.
Where is the problem??
Ing. Giorgio Alboni
Via Bertini, 75
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