Howto configure the Linux kernel / drivers / firmware

For a description of the syntax of this configuration file,
see Documentation/kbuild/kconfig-language.txt.

Firmware DriversEdit

  • Option: EDD
    • Kernel Versions: ...
    • (on/off/module) BIOS Enhanced Disk Drive calls determine boot disk (EXPERIMENTAL)
    • depends on EXPERIMENTAL
    • depends on !IA64
      Say Y or M here if you want to enable BIOS Enhanced Disk Drive Services real mode BIOS calls to determine which disk BIOS tries boot from. This information is then exported via sysfs.
      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.

  • Option: EFI_VARS
    • Kernel Versions: ...
    • (on/off/module) EFI Variable Support via sysfs
    • depends on EFI
    • default n
      If you say Y here, you are able to get EFI (Extensible Firmware Interface) variable information via sysfs. You may read, write, create, and destroy EFI variables through this interface.
      Note that using this driver in concert with efibootmgr requires at least test release version 0.5.0-test3 or later, which is available from Matt Domsch's website located at: <>
      Subsequent efibootmgr releases may be found at: <>

  • Option: EFI_PCDP
    • Kernel Versions: ...
    • (on/off) Console device selection via EFI PCDP or HCDP table
    • depends on ACPI && EFI && IA64
    • default y if IA64
      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=hcdp" kernel boot argument.
      Neither the PCDP nor the HCDP affects naming of serial devices, so a serial console may be /dev/ttyS0, /dev/ttyS1, etc., depending on how the driver discovers devices.
      You must also enable the appropriate drivers (serial, VGA, etc.)
      See <>

  • Option: DELL_RBU
    • Kernel Versions: ...
    • (on/off/module) BIOS update support for DELL systems via sysfs
    • depends on X86
    • select FW_LOADER
      Say m if you want to have the option of updating the BIOS for yourDELL system. Note you need a Dell OpenManage or Dell Update package (DUP)supporting application to communicate with the BIOS regarding the newimage for the image update to take effect.See <file:Documentation/dell_rbu.txt> for more details on the driver.

  • Option: DCDBAS
    • Kernel Versions: ...
    • (on/off/module) Dell Systems Management Base Driver
    • depends on X86
      The Dell Systems Management Base Driver provides a sysfs interface for systems management software to perform System Management Interrupts (SMIs) and Host Control Actions (system power cycle or power off after OS shutdown) on certain Dell systems.
      See <file:Documentation/dcdbas.txt> for more details on the driver and the Dell systems on which Dell systems management software makes use of this driver.
      Say Y or M here to enable the driver for use by Dell systems management software such as Dell OpenManage.

Linux Kernel Configuration

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