Hello maintainers, Crossing over from a thread in linux-integrity (<CAO-sURTs1dc_5iY+b34Jqj4hxZFdUj9LZxTWhDdvqM8AbEqMAw@xxxxxxxxxxxxxx>), the fTPM on the Dell Inspiron 11 3000 reports its TPM registers inside ACPI NV space. This causes the TPM to fail to run as the address space has already been mapped by acpi/nvs.c prior to the TPM driver loading. In discussion with Jarkko and mjg, as well as contacts with the manufacturer, this appears to something that Linux should support, despite being arguably broken. Because the fTPM is part of the ODM BIOS, this isn't something that can realistically be fixed through firmware updates; it's going to be scattered across many different devices and many different manufacturers -- and because Windows already works around this particular brain-damage, there's not as much leverage that can be applied. The full ACPI dump and the output of dmidecode can be found at https://gist.github.com/hlieberman-gov/83fa708d41051bafccc553cf0147db4f. I have machines that are set-aside for testing, running both Windows 10 and Debian sid, and I'm happy to help test possible fixes. Sincerely, -- Harlan Lieberman-Berg Defense Digital Service
