Comment 124 for bug 1810239

My kernel lives on another disk drive. /dev/sda1 is my EFI system partition, /dev/sda2 is the MSR, /dev/sda3 is NTFS Windows 7, /dev/sda4 is my / partition. Marvell controller is the SSD on /dev/sdb. I don't know what you mean by "preset bit" (sorry, I'm not so fluent in C).

I'm using the SSD with an embedded Marvell controller as a caching device (enhanceio when I posted to this bug, but I just switched to bcache) for a slower hard drive. I did briefly consider enhanceio might be the problem, so I disabled it completely to test. This didn't make a difference; with intel_iommu, the kernel throws the dmar errors, and I can't access /dev/sdb.