ACPI / init: Make it possible to override _REV

[cascardo/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 84960c6..1801024 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -165,7 +165,7 @@ multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10, 2^20, and 2^30
 bytes respectively. Such letter suffixes can also be entirely omitted.
 
 
-       acpi=           [HW,ACPI,X86]
+       acpi=           [HW,ACPI,X86,ARM64]
                        Advanced Configuration and Power Interface
                        Format: { force | off | strict | noirq | rsdt }
                        force -- enable ACPI if default was off
@@ -175,6 +175,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                                strictly ACPI specification compliant.
                        rsdt -- prefer RSDT over (default) XSDT
                        copy_dsdt -- copy DSDT to memory
+                       For ARM64, ONLY "acpi=off" or "acpi=force" are available
 
                        See also Documentation/power/runtime_pm.txt, pci=noacpi
 
@@ -273,6 +274,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        acpi_os_name=   [HW,ACPI] Tell ACPI BIOS the name of the OS
                        Format: To spoof as Windows 98: ="Microsoft Windows"
 
+       acpi_rev_override [ACPI] Override the _REV object to return 5 (instead
+                       of 2 which is mandated by ACPI 6) as the supported ACPI
+                       specification revision (when using this switch, it may
+                       be necessary to carry out a cold reboot _twice_ in a
+                       row to make it take effect on the platform firmware).
+
        acpi_osi=       [HW,ACPI] Modify list of supported OS interface strings
                        acpi_osi="string1"      # add string1
                        acpi_osi="!string2"     # remove string2
@@ -3786,6 +3793,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                                        READ_CAPACITY_16 command);
                                f = NO_REPORT_OPCODES (don't use report opcodes
                                        command, uas only);
+                               g = MAX_SECTORS_240 (don't transfer more than
+                                       240 sectors at a time, uas only);
                                h = CAPACITY_HEURISTICS (decrease the
                                        reported device capacity by one
                                        sector if the number is odd);