Provided by: u-boot-menu_4_all bug

NAME

       u-boot-update - program to generate u-boot menu files

SYNOPSIS

       u-boot-update

DESCRIPTION

       u-boot-update  is  a  tool  used to generate the menu files used by the U-BOOT bootloader.
       Options can be configured in /etc/default/u-boot.

OPTIONS

       U_BOOT_UPDATE="true|false"
           This variable specifies if u-boot-update is allowed to modify the configuration  files
           in /boot/extlinux. Values are either 'true' or 'false', default is 'true'.

       U_BOOT_ALTERNATIVES="default recovery"
           This  variable  specifies  which  entries  u-boot-update  is  populating.  Values  are
           'default', 'recovery', 'live', default is 'default recovery'.

       U_BOOT_DEFAULT="l0"
           This variable specifies the default entry to boot. The name of an  entry  consists  of
           two or three characters. Linux kernel images start with the letter 'l', followed by an
           integer started by '0' for the first kernel version (which is numerically the  highest
           one  in  case  kernel  images  of  more  than  one  linux  version are installed) and,
           optionally, the mode (r for rescue mode, l for live mode). Memdisk entries start  with
           the  letter  'm',  followed by an integer, no optional modes available. The default is
           'l0'.

       U_BOOT_ENTRIES="all"
           This variables specifies how many kernel versions should be used to populate the  boot
           configuration.  Value  is  an  integer  starting  with 1, or 'all' to populate for all
           kernels, default is 'all'.

       U_BOOT_MENU_LABEL="Debian GNU/Linux, kernel"
           This variable specifies the text that is used as a description in the boot menu. Value
           is  an  arbitrary  string.  If  lsb_release  is  installed,  the  distributors  id  is
           automatically determined. If lsb_release is not  available,  it  defaults  to  'Debian
           GNU/Linux, kernel'.

       U_BOOT_PARAMETERS="ro quiet"
           This  variable  specifies  additional boot parameters that are appended to each kernel
           entry. Value is an arbitrary string,  default  is  'ro  quiet'  (except  for  recovery
           entries, where quiet is avoided).

       U_BOOT_ROOT="root=DEVICE"
           This  variable  specifies  the  root  partition.  It  is  automatically extracted from
           /etc/fstab. U-BOOT supports both devices and UUIDs.

       U_BOOT_TIMEOUT="50"
           This variable specifies the time that U-BOOT should wait for user input  during  boot.
           Values  are  in  decisecond  greater  than  0  (e.g.  '10'  for a 1 second timeout), 0
           specifies to wait forever. The default is 50.

FILES

       /etc/default/u-boot

HOMEPAGE

       More information about U-BOOT can be found at <http://www.denx.de/wiki/U-Boot>.

       u-boot-update and this manual page was written by Daniel Baumann <daniel.baumann@progress-
       technologies.net>  for  extlinux. Riku Voipio <riku.voipio@linaro.org> updated them for u-
       boot.