1# 2# For a description of the syntax of this configuration file, 3# see Documentation/kbuild/kconfig-language.txt. 4# 5 6menu "Firmware Drivers" 7 8config EDD 9 tristate "BIOS Enhanced Disk Drive calls determine boot disk (EXPERIMENTAL)" 10 depends on EXPERIMENTAL 11 depends on !IA64 12 help 13 Say Y or M here if you want to enable BIOS Enhanced Disk Drive 14 Services real mode BIOS calls to determine which disk 15 BIOS tries boot from. This information is then exported via sysfs. 16 17 This option is experimental and is known to fail to boot on some 18 obscure configurations. Most disk controller BIOS vendors do 19 not yet implement this feature. 20 21config EFI_VARS 22 tristate "EFI Variable Support via sysfs" 23 depends on EFI 24 default n 25 help 26 If you say Y here, you are able to get EFI (Extensible Firmware 27 Interface) variable information via sysfs. You may read, 28 write, create, and destroy EFI variables through this interface. 29 30 Note that using this driver in concert with efibootmgr requires 31 at least test release version 0.5.0-test3 or later, which is 32 available from Matt Domsch's website located at: 33 <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz> 34 35 Subsequent efibootmgr releases may be found at: 36 <http://linux.dell.com/efibootmgr> 37 38config EFI_PCDP 39 bool "Console device selection via EFI PCDP or HCDP table" 40 depends on ACPI && EFI && IA64 41 default y if IA64 42 help 43 If your firmware supplies the PCDP table, and you want to 44 automatically use the primary console device it describes 45 as the Linux console, say Y here. 46 47 If your firmware supplies the HCDP table, and you want to 48 use the first serial port it describes as the Linux console, 49 say Y here. If your EFI ConOut path contains only a UART 50 device, it will become the console automatically. Otherwise, 51 you must specify the "console=hcdp" kernel boot argument. 52 53 Neither the PCDP nor the HCDP affects naming of serial devices, 54 so a serial console may be /dev/ttyS0, /dev/ttyS1, etc, depending 55 on how the driver discovers devices. 56 57 You must also enable the appropriate drivers (serial, VGA, etc.) 58 59 See <http://www.dig64.org/specifications/DIG64_HCDPv20_042804.pdf> 60 61endmenu 62