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

Signed-off-by: Andy Shevchenko <andriy.shevche...@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.
-- 
2.13.2

_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot

Reply via email to