Services real mode BIOS calls to determine which disk
BIOS tries boot from. This information is then exported via sysfs.
- This option is experimental, but believed to be safe,
- and most disk controller BIOS vendors do not yet implement this feature.
+ This option is experimental and is known to fail to boot on some
+ obscure configurations. Most disk controller BIOS vendors do
+ not yet implement this feature.
config EFI_VARS
tristate "EFI Variable Support via sysfs"
Subsequent efibootmgr releases may be found at:
http://linux.dell.com/efibootmgr
+config EFI_PCDP
+ bool "Console device selection via EFI PCDP or HCDP table"
+ depends on ACPI && EFI && IA64
+ default y if IA64
+ help
+ If your firmware supplies the PCDP table, and you want to
+ automatically use the primary console device it describes
+ as the Linux console, say Y here.
+
+ If your firmware supplies the HCDP table, and you want to
+ use the first serial port it describes as the Linux console,
+ say Y here. If your EFI ConOut path contains only a UART
+ device, it will become the console automatically. Otherwise,
+ you must specify the "console=ttyS0" kernel boot argument.
+
+ You must also enable the appropriate drivers (serial, VGA, etc.)
+
+ See <http://www.dig64.org/specifications/DIG64_HCDPv20_042804.pdf>
+
endmenu