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/dev/ata patch for FreeBSD 4.7+

  • ata_47rc.pio.patch
    If UDMA CRC error occures this patch switches IDE controller to UDMA-33, then to WDMA-2 and only after this to PIO. Keeps statistics of successfull operations after switching to slower modes. If more than 1/3 of operations causing UDMA CRC errors succeed after slowdown, the controller is instantly switched to this mode. The original transfer rate is restored after reinitialization.
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