I am attempting to build SCMI [1] support for the DSDT for asus/p3b-f to get around a PCI<->ACPI resource conflict that renders the whole SMBus and the hardware monitor inoperative. The board has ACPI AML hooks that run before and after suspend and resume, so my plan is to have Linux access the SMBus exclusively through ACPI, using the driver i2c-scmi.
The spec calls for methods _SBI, _SBR, _SBW, _SBT, _SBA. I don't need the last two for my purpose so I'll skip them. During build iasl warns that they are unrecognized reserved methods and **our build process treats all warning as errors** so my build broke.
The driver knows that some IBM bioses implementing the methods without the leading underscores, but it only expects this on devices with an _HID of "SMBUSIBM". If I use this _HID, iasl errors out: "_HID suffix must be all hex digits (SIBM)", so I have to use SMB0001, for which i2c-scmi would only look for the _SB? methods, that from what I can see is the correct way. So either my build breaks, or I can expect a build that is not going to work.
I cannot proceed unless I hack the build process (I send in a patch to Makefile.inc to make an exception for p3b-f) to disregard iasl warnings.
And if I resolve the conflict by removing all ASL code for SMBus access, I would have no working suspend, even S1.
What am I supposed to do?
Thanks Keith