It is properly not the fault of parport driver. I can't reproduce the
corruption. May be is other thigns that cause the boot loader failed.
I have other problems now. While I am trying to interfacing with a device,
just for a test purposese, so there is no read write functions at all, the
driver only report the device's ID. at first I got a message of:
parport0: Pheripheral not IEEE1284 compliant (0xC8)
When I trace into my low level function, the upper layer issue the 'read'
function without making the data line reverse. At this point I am not clear of
what the usage of xxx_data_forward() and xxx_data_reverse(). Does the upper
layer should call the reverse function before making a read? The one I am
tracing is parport_device_id(), there are parport_read() calls without
setting the direction. I have change my read function to change to reverse
mode then forward before return, that seems solve partially my problem. Is
this the right way?
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