[PARPORT] I/O hang with epat in kernel 2.4

From: Stephen Mollett (molletts@yahoo.com)
Date: Fri Mar 02 2001 - 15:22:07 EST

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    I am using a SyQuest EZ230 drive (epat protocol) with kernel 2.4.x (all 2.4
    versions so far are affected). When I try to access the drive, having
    modprobed the drivers, the process attempting to access it hangs
    (uninterruptible sleep) and can only be killed by a reboot. The console log
    shows repeated errors.

    I have tried this with different port delays, in SPP, PS/2 and EPP modes,
    with and without SuperIO detection enabled and on two different machines (one
    SMP, the other UP). If I boot to kernel 2.2.17, the drive works perfectly.

    Regards,
    Stephen Mollett

    [console log dumps follow]

    $ modprobe parport_pc

    ...
    Winbond Super-IO detection, now testing ports 3F0,370,250,4E,2E ...
    Winbond chip at EFER=0x3f0 key=0x87 devid=97 devrev=73 oldid=ff
    Winbond chip type 83977TF / SMSC 97w33x/97w34x
    Winbond LPT Config: cr_30=01 60,61=0378 70=07 74=04, f0=39
    Winbond LPT Config: active=yes, io=0x0378 irq=7, dma=none
    Winbond LPT Config: irqtype=pulsed low, high-Z, ECP fifo threshold=7
    Winbond LPT Config: Port mode=EPP-1.9 and SPP
    SMSC Super-IO detection, now testing Ports 2F0, 370 ...
    parport0: PC-style at 0x378 [PCSPP,TRISTATE,EPP]
    parport0: irq 7 detected
    parport0: cpp_mux: aa55f00f52ad51(16)
    parport0: cpp_daisy: aa5500ff(10)
    parport0: assign_addrs: aa5500ff(10)
    parport0: cpp_mux: aa55f00f52ad51(06)
    parport0: cpp_daisy: aa5500ff(00)
    parport0: assign_addrs: aa5500ff(00)
    parport0: No more nibble data (0 bytes)
    parport0: faking semi-colon
    parport0: Legacy device

    $ modprobe epat
    $ modprobe pd

    ...
    paride: version 1.05 installed
    paride: epat registered as protocol 0
    pd: pd version 1.05, major 45, cluster 64, nice 0
    pda: Sharing parport0 at 0x378
    pda: epat 1.01, Shuttle EPAT chip c3 at 0x378, mode 5 (EPP-32), delay 0
    pda: SyQuest EZ230A, master, 450560 blocks [220M], (880/16/32), removable
    media
     pda: pda1

    $ mke2fs /dev/pda1

    ...
    pda: do_pd_write_drq: status = 0x10052 = INDEX SEEK READY TMO
    pda: do_pd_write_drq: status = 0x10052 = INDEX SEEK READY TMO
    (etc.)

    or
    $ mount /dev/pda1 /syquest

    pda: do_pd_read_drq: status = 0x205b = ERR INDEX DRQ SEEK READY MC
    pda: do_pd_read: status = 0x205b = ERR INDEX DRQ SEEK READY MC
    pda: do_pd_read: status = 0x205b = ERR INDEX DRQ SEEK READY MC
    (etc.)

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    This archive was generated by hypermail 2b29 : Fri Mar 02 2001 - 15:14:36 EST