diff options
Diffstat (limited to 'docs/specs/acpi_mem_hotplug.txt')
| -rw-r--r-- | docs/specs/acpi_mem_hotplug.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt index dcc4808918..68daa14764 100644 --- a/docs/specs/acpi_mem_hotplug.txt +++ b/docs/specs/acpi_mem_hotplug.txt @@ -31,7 +31,10 @@ 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 |