[U-Boot] [PATCH v1 7/7] x86: acpi: Don't touch hardware on HW reduced platforms

If ACPI HW reduced bit in FADT is set we should ignore any ACPI hardware communications.

Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com --- arch/x86/lib/acpi_table.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c index da6014fb41..3eb101105b 100644 --- a/arch/x86/lib/acpi_table.c +++ b/arch/x86/lib/acpi_table.c @@ -463,6 +463,10 @@ ulong write_acpi_tables(ulong start)

debug("ACPI: done\n");

+ /* Don't touch ACPI hardware on HW reduced platforms */ + if (fadt->flags & ACPI_FADT_HW_REDUCED_ACPI) + return current; + /* * Other than waiting for OSPM to request us to switch to ACPI mode, * do it by ourselves, since SMI will not be triggered.