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Subject[PATCH 1/2] x86/boot: Clarify what x86_legacy_features.reserve_bios_regions does
Date
It doesn't just control probing for the EBDA -- it controls whether we
detect and reserve the <1MB BIOS regions in general.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
arch/x86/include/asm/x86_init.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index c519c052700a..66c15a01667f 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -168,8 +168,9 @@ struct x86_legacy_devices {
* struct x86_legacy_features - legacy x86 features
*
* @rtc: this device has a CMOS real-time clock present
- * @reserve_bios_regions: it's safe to search for the EBDA signature in the hardware's
- * low RAM
+ * @reserve_bios_regions: boot code will search for the EBDA address and the
+ * start of the 640k - 1M BIOS region. If false, the platform must
+ * ensure that its memory map correctly reserves sub-1MB regions as needed.
* @devices: legacy x86 devices, refer to struct x86_legacy_devices
* documentation for further details.
*/
--
2.7.4
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