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    SubjectRe: [Linaro-acpi] [PATCH v7 04/17] ARM64 / ACPI: Introduce early_param for "acpi" and pass acpi=force to enable ACPI
    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.

    --
    Qualcomm Innovation Center, Inc.
    The Qualcomm Innovation Center, Inc. is a member of the
    Code Aurora Forum, a Linux Foundation Collaborative Project.


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