[Linux-parport] EPP Mode can not be activated

Adam Baker parport at baker-net.org.uk
Tue Aug 16 15:33:23 EDT 2005

On Tuesday 16 August 2005 11:19, Matthias Färber wrote:
> Hello everybody,
> I´m searching for a solution to get my parport ready for the connection
> of a device that uses EPP mode for communication.
> Does anyone have any hints to solve my problem ?

remove the chunk of code in parport-pc.c that reads

        /* Check for Intel bug. */
        if (priv->ecr) {
                unsigned char i;
                for (i = 0x00; i < 0x80; i += 0x20) {
                        ECR_WRITE (pb, i);
                        if (clear_epp_timeout (pb)) {
                                /* Phony EPP in ECP. */
                                return 0;

then rebuild. You don't need to install the complete new kernel, just the new 
parport_pc module.

This has been discussed a few times before on the list. The consensus seems to 
be that that code prevents the detection of working EPP h/w more often than 
it detects the old buggy h/w but no-one here seems to know the right way to 
go about getting the code removed from kernel.org

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