Re: [PARPORT] ppdev and EPP mode

From: Vince Weaver (
Date: Mon Apr 10 2000 - 20:01:26 EDT

  • Next message: Tim Waugh: "Re: [PARPORT] ppdev and EPP mode"

    > > so the question is, can EPP be done with ppdev?
    > Yes, and it's even been tested a little bit in 2.3.x.

    ok, next question... we are using our device on these old Compaq computers
    that only support ECP.

    By writing 0x80 to port 0x378+0x402 we can set the ECP to do "EPP
    compatibility mode" and everything works fine with doing direct EPP by
    hitting the ports directly...

    will ppdev know to do the above if I set IEEE1284_MODE_EPP on this

    following is the relevant dmesg [this is 2.3.99-pre4-pre5 as 2.3.99-pre3
    would oops whenever I did ppdev stuff].

    0x378: FIFO is 16 bytes
    0x378: writeIntrThreshold is 8
    0x378: readIntrThreshold is 8
    0x378: PWord is 8 bits
    0x378: Interrupts are ISA-Pulses
    0x378: ECP port cfgA=0x1c cfgB=0x4b
    0x378: ECP settings irq=7 dma=3
    parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE,ECP]
    parport0: irq 7 detected
    parport0: cpp_daisy: aa5500ff(38)
    parport0: assign_addrs: aa5500ff(38)
    parport0: cpp_daisy: aa5500ff(38)
    parport0: assign_addrs: aa5500ff(38)

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