Messages in this thread | | | Date | Thu, 29 Jan 2015 12:34:50 -0600 | From | Timur Tabi <> | 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 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.
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