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    SubjectRe: [PATCH] arm64: support ACPI tables outside of kernel RAM
    On Fri, May 22, 2015 at 08:46:02AM -0400, Mark Salter wrote:
    > On Fri, 2015-05-22 at 11:34 +0100, Catalin Marinas wrote:
    > > OK, so my preferred options, in this order:
    > >
    > > 1. Change the core ACPI kernel code to distinguish between mapping I/O
    > > or RAM (could be as simple as acpi_map not using acpi_os_ioremap but
    > > another API). I guess the code knows when it plans to map tables or
    > > I/O registers
    > >
    > > 2. If the above is not possible, add the extra checks as per Mark's
    > > patch but I would rather call this resource "UEFI RAM" than "ACPI",
    > > it's not really ACPI specific.
    >
    > Actually, it is ACPI specific. The patch only registers resources for
    > EfiACPIReclaimMemory and EfiACPIMemoryNVS regions which are also
    > marked as cacheable. On x86 these show up in /proc/iomem as
    > "ACPI Tables" and "ACPI Non-volatile Storage". I used "ACPI RAM" to
    > avoid having to search for two strings.

    My point is more about UEFI describing the entire RAM while the kernel
    command line restricts it via "mem=". In this case, the "System RAM"
    resources is reduced as well but it does not necessarily mean that the
    rest of the RAM is only used by ACPI.

    --
    Catalin


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