I'm writing a usermode driver for my Brother MFC 4600 printer/scanner/fax.
The driver periodically polls the device for incoming data packets
by switching to IEEE reverse byte mode, reading the data (if any) from
the port and then switching back to compat mode.
It works OK as long as the computer is idle. As soon as I put any kind of
load on a CPU (even running ps on another console)
ioctl (parport,PPNEGOT,&IEEE_MODE_BYTE) starts failing with
I'm running 2.4.7 kernel on P120 Toshiba laptop.
Parport driver correctly auto-detects TRISTATE, ECP, DMA and IRQ settings
and otherwise appears to be configured and functioning properly.
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This archive was generated by hypermail 2b29 : Sun Sep 23 2001 - 23:42:18 EDT