No U-SCSI for AIC7880 and 2.6.13 kernel

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After upgrading the SMP kernel on my PR440FX box, the SCSI
subsystem switched from U-SCSI to FAST-SCSI mode. There are
three devices connected to the on-board AHA-2940UW device.
This change happens when booting a 2.6.13 kernel. As soon as
I return to a 2.6.12 based kernel, everything works right.
The attached hard disk is a QUANTUM Atlas 10k III drive.
Now, the transfer rate ia a mere 18 MB/s compared to 28 MB/s
which was acceptable for the AIC7880 based UW-interface.


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