On Tue, 08 Oct 2002 11:51:21 +0100, Shaun<email@example.com> wrote:
> I have been trying to get redhat 7.2 to recognise my parport in ECP mode
> so that I can run some dongle enabled software under VMWare. For this I
> need VMWare to have a bidirectional parallel port.
> The port is recognised by linux but the only mode available is PCSPP
> The bios supports standard, bi-directional,ECP and EPP but all of these
> give the same result.
> I have tried the suggested workaround from the people.redhat site for
> VMWare and I have upgraded to VMWare 3.2 but this makes no difference.
> Shaun Coughlin
RedHat 7.2 is shipped with ECP support turned off. To turn it on, you
need to (at a minimum) rebuild and install the parport_pc.o module
with CONFIG_PARPORT_PC_FIFO enabled (CONFIG_PARPORT_PC_FIFO=y in the
config). Then you also have to put the magic incantation into
/etc/modules.conf to tell the module to use ECP mode and the FIFO.
Usually the easiest way to do this is the following (as root):
cp configs/<whatever the appropriate config for your system is> .config
click on "Parallel port support"
set "Use FIFO/DMA if available (EXPERIMENTAL)" to "y"
click on "Main Menu"
click on "Save and Exit"
*Don't* do "make install" or "make modules-install" unless you really
want to install your newly built kernel and/or modules. Instead, you
can just replace the one module you're really interested in:
cd /lib/modules/<your kernel version number>/kernel/drivers/parport
mv parport_pc.o parport_pc.o.orig
cp -p /usr/src/linux-2.4/drivers/parport/parport_pc.o parport_pc.o.new
cp -p parport_pc.o.new parport_pc.o
[ Note that this preserves the original parport_pc.o modules in case you don't
like the new one ]
Then add the following to /etc/modules.conf:
options parport_pc irq=auto dma=auto (this line if you want to use DMA)
options parport_pc irq=auto dma=none (this line if you don't want to use DMA)
Then unload your parport-related modules so the new one will load next
time you try to use it:
rmmod lp parport_pc parport
But then as Tim Waugh notes you don't need ECP mode to have a bidirectional
-- Dave Strauss
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