From: Colin Ian King <colin.k...@canonical.com>
BugLink: https://bugs.launchpad.net/bugs/1529381
Some HP laptops seem to have invalid 64 bit FADT X_PM* addresses
which are causing various boot issues. In these cases, it would
be useful to force ACPI to use the valid legacy 32 bit equivalent
PM addresses. Add a acpi_force_32bit_fadt_addr to set the ACPICA
acpi_gbl_use32_bit_fadt_addresses to TRUE to force this override.
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
Documentation/kernel-parameters.txt | 6 ++++++
drivers/acpi/tables.c | 10 ++++++++++
2 files changed, 16 insertions(+)
diff --git a/Documentation/kernel-parameters.txt
b/Documentation/kernel-parameters.txt
index 3ea869d..3782024 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -193,6 +193,12 @@ bytes respectively. Such letter suffixes can also be
entirely omitted.
(e.g. thinkpad_acpi, sony_acpi, etc.) instead
of the ACPI video.ko driver.
+ acpi_force_32bit_fadt_addr
+ force FADT to use 32 bit addresses rather than the
+ 64 bit X_* addresses. Some firmware have broken 64
+ bit addresses for force ACPI ignore these and use
+ the older legacy 32 bit addresses.
+
acpica_no_return_repair [HW, ACPI]
Disable AML predefined validation mechanism
This mechanism can repair the evaluation result to make
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 6c0f079..ebdf564 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -484,3 +484,13 @@ static int __init acpi_force_table_verification_setup(char
*s)
}
early_param("acpi_force_table_verification",
acpi_force_table_verification_setup);
+
+static int __init acpi_force_32bit_fadt_addr(char *s)
+{
+ pr_info("Forcing 32 Bit FADT addresses\n");
+ acpi_gbl_use32_bit_fadt_addresses = TRUE;
+
+ return 0;
+}
+
+early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
--
1.9.1
