Questions about the CMD640 and RZ1000 bugfix support options

From: Christoph Anton Mitterer (cam_at_mathematica.scientia.net)
Date: 12/31/04

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    Date:	Fri, 31 Dec 2004 23:26:14 +0100
To: linux-kernel@vger.kernel.org

    Hi.

    First of all: A happy new year in advance!

    Now to my question:
    In the kernel-configuration there are the two options:
    CONFIG_BLK_DEV_CMD640 CMD640 chipset bugfix/support
    and
    CONFIG_BLK_DEV_RZ1000 RZ1000 chipset bugfix/support

    At least the second of those two seems to cause some little slowdown
    ("This may slow disk throughput by a few percent, but at least things
    will operate 100% reliably.").
    1) Is the bigfixing code only activated when a buggy chipset is detected
    or do I even have a slowdown with proper a properchipset?
    2) Can some help me to find out if my system has one of those two
    chipsets. This might be a dumb question but I'm not sure if
    CMD640/RZ1000 are only some little IDE controller chipsets or if they
    were some kind of Southbridge/Nortbridge.
    If got a Epox 8KTA2 mainboard (having VIA VT82C686A/B chipset).

    Thanks in advance!

    Greetings,
    Christoph Anton Mitterer.

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