Messages in this thread | | | Date | Thu, 29 Jan 2015 13:44:36 -0500 | From | Jon Masters <> | Subject | Re: [Linaro-acpi] [PATCH v7 04/17] ARM64 / ACPI: Introduce early_param for "acpi" and pass acpi=force to enable ACPI |
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On 01/29/2015 01:34 PM, Timur Tabi wrote: > On 01/29/2015 12:28 PM, Ard Biesheuvel wrote: >> The UEFI stub in the kernel uses the DTB file format (FDT) to pass >> information about the UEFI memory map and system table to the kernel. >> It does so even if there is no device tree that describes the >> platform. In this case, the file only contains a /chosen DT node, and >> nothing else, and it is up to the kernel to figure out that it can ask >> UEFI for a set of ACPI tables that it can use instead to configure the >> system. Otherwise, the /chosen node properties are added to a device >> tree that contains the full platform description. >> >> The problem is that we have to decide how to distinguish a >> conventional device tree DTB from a DTB that only exists to >> communicate the UEFI entry points. > > Ah, that's exactly what I'm seeing. The UEFI stub in our kernel > generates a DTB, and therefore I always need to put acpi=force on our > kernel command line.
I expect some of the distros to patch ACPI always enabled. So from my point of view this affects only those wanting to follow upstream.
Jon.
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