ubuntu_linux /boot/grub/grub.conf解析

==========================================UBUNTU /boot/grub/grub.conf文件==========================================

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}

if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
set timeout=30
else
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=hidden
set timeout=0
# Fallback hidden-timeout code in case the timeout_style feature is
# unavailable.
elif sleep --interruptible 0 ; then
set timeout=0
fi
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
set gfxpayload="${1}"
if [ "${1}" = "keep" ]; then
set vt_handoff=vt.handoff=7
else
set vt_handoff=
fi
}
if [ "${recordfail}" != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
linux /boot/vmlinuz-4.4.0-72-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
initrd /boot/initrd.img-4.4.0-72-generic
}
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
menuentry 'Ubuntu, with Linux 4.4.0-72-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-72-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-72-generic ...'
linux /boot/vmlinuz-4.4.0-72-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-72-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-72-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-72-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-72-generic ...'
linux /boot/vmlinuz-4.4.0-72-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-72-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-66-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-66-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-66-generic ...'
linux /boot/vmlinuz-4.4.0-66-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-66-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-66-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-66-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-66-generic ...'
linux /boot/vmlinuz-4.4.0-66-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-66-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-64-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-64-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-64-generic ...'
linux /boot/vmlinuz-4.4.0-64-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-64-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-64-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-64-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-64-generic ...'
linux /boot/vmlinuz-4.4.0-64-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-64-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-59-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-59-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-59-generic ...'
linux /boot/vmlinuz-4.4.0-59-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-59-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-59-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-59-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-59-generic ...'
linux /boot/vmlinuz-4.4.0-59-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-59-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-57-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-57-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-57-generic ...'
linux /boot/vmlinuz-4.4.0-57-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-57-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-57-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-57-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-57-generic ...'
linux /boot/vmlinuz-4.4.0-57-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-57-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-53-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-53-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-53-generic ...'
linux /boot/vmlinuz-4.4.0-53-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-53-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-53-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-53-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-53-generic ...'
linux /boot/vmlinuz-4.4.0-53-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-53-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-45-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-45-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-45-generic ...'
linux /boot/vmlinuz-4.4.0-45-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-45-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-45-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-45-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-45-generic ...'
linux /boot/vmlinuz-4.4.0-45-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-45-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-42-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-42-generic-advanced-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-42-generic ...'
linux /boot/vmlinuz-4.4.0-42-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-42-generic
}
menuentry 'Ubuntu, with Linux 4.4.0-42-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-42-generic-recovery-87f8333a-b6dc-49f7-89f9-ef6a91eb756b' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
echo 'Loading Linux 4.4.0-42-generic ...'
linux /boot/vmlinuz-4.4.0-42-generic root=UUID=87f8333a-b6dc-49f7-89f9-ef6a91eb756b ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.4.0-42-generic
}
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry 'Memory test (memtest86+)' {
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
knetbsd /boot/memtest86+.elf
}
menuentry 'Memory test (memtest86+, serial console 115200)' {
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
else
search --no-floppy --fs-uuid --set=root 87f8333a-b6dc-49f7-89f9-ef6a91eb756b
fi
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

============================================================================================

default=数字：默认启动的操作系统，数字0表示第一个标题，1表示第二个，以此类推；

timeout=数字：一般选项界面出现的时间，单位秒；

root（装置）：指定内核或操作系统所在的磁盘与分区，格式为（hdx，y），其中x表示第x个磁盘，y表示第y个分区，如root（hd0,1）；

initrd 文件：制定系统加载时所需要的内存磁盘以映像，同样的，文件所在的位置必须在root所定义的磁盘之下；

============================================================================================

run level

Linux的运行层级（run level）共7个，

0：关机；

1：单人模式；

2/3/4/5:因不同的发行商而异；Feroda:2-->缺少部分网络功能的文字界面模式，3-->完整功能的文字界面模式，4-->保留，可自定义；5-->完整功能的图形界面模式；

6：重新启动系统；

=====================================================================================================

过程解析

BIOS---》stage1---》stage1.5---》stage2---》vmlinuxz---》initrd---》读取/etc/event.d/rc-default-----未定义/etc/inittab>启动runlevel2------------------|----》启动画面

ＧＲＵＢ 内核 |_____定义/etc/inittab(默认)>根据/etc/inittab定义的runlevel进行启动---|

＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝

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