@@ -19,7 +19,9 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
1: Device insert event, used to distinguish device for which
no device check event to OSPM was issued.
It's valid only when bit 1 is set.
- 2-7: reserved and should be ignored by OSPM
+ 2: Device remove event, used to distinguish device for which
+ no device check event to OSPM was issued.
+ 3-7: reserved and should be ignored by OSPM
[0x15-0x17] reserved
write access:
@@ -31,11 +33,19 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
[0xc-0x13] reserved, writes into it are ignored
[0x14] Memory device control fields
bits:
- 0: reserved, OSPM must clear it before writing to register
+ 0: reserved, OSPM must clear it before writing to register.
+ Due to BUG in versions prior 2.4 that field isn't
+ cleared when other fields are written.Keep it reserved
+ and don't try to reuse it.
1: if set to 1 clears device insert event, set by OSPM
after it has emitted device check event for the
selected memory device
- 2-7: reserved, OSPM must clear them before writing to register
+ 2: if set to 1 clears device remove event, set by OSPM
+ after it has emitted device check event for the
+ selected memory device
+ 3: if set to 1 initiates device eject, set by OSPM when it
+ triggers memory device removal and calls _EJ0 method
+ 4-7: reserved, OSPM must clear them before writing to register
and extend aml_field() to support UpdateRule + modify acpi-build.c as follow:
@@ -922,7 +922,8 @@ build_ssdt(GArray *table_data, GArray *linker,
aml_named_field(stringify(MEMORY_SLOT_PROXIMITY), 32));
aml_append(scope, field);
- field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), aml_byte_acc);
+ field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), aml_byte_acc,
+ aml_write_as_zeros);
aml_append(field, aml_reserved_field(160 /* bits, Offset(20) */));
aml_append(field, /* 1 if enabled, read only */
aml_named_field(stringify(MEMORY_SLOT_ENABLED), 1));