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Linux Guest and LSI 4.x scsi driver

I have a linux guest (2.6.23 based) that uses the new-ish LSI driver, version 4002100. However, it fails to see any disks, and fails during probe with

mptspi: ioc0: WARNING - Skipping because it's not operational!

This is not the problem of a few years ago where 'pfacts' was incorrectly reporting the max number of sub-devs.

My guess is that in mptbase.c, when mpt_GetIocState() calls

s = CHIPREG_READ32(&ioc->chip->Doorbell);

it is not getting the correct value.

Anyone (LSI????) have any ideas on what to try?

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