Dualboot with Windows from secondary MBR drive using e.g. grub/refind

Question

Hi!
I'm trying to get my secondary drive with Windows 8, installed in MBR-mode to boot using either grub2, refind or any other suitable bootloader. "bootinfoscript" return:
Boot Info Script 0.61 [1 April 2012]
============================= Boot Info Summary: ===============================
=> is installed in the MBR of /dev/sda.
=> Windows is installed in the MBR of /dev/sdb.
sda1: __________________________________________________________________________
File system: vfat
Boot sector type: FAT32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /grub/grub.cfg /efi/arch_grub/grubx64.efi
/efi/refind/refind_x64.efi
sda2: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Arch Linux ()
Boot files: /etc/fstab
sdb1: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /bootmgr /Boot/BCD
sdb2: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /bootmgr /Windows/System32/winload.exe
sdb3: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
============================ Drive/Partition Info: =============================
Drive: sda _____________________________________________________________________
Disk /dev/sda: 55.9 GiB, 60022480896 bytes, 117231408 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Partition Boot Start Sector End Sector # of Sectors Id System
/dev/sda1 1 117,231,407 117,231,407 ee GPT
GUID Partition Table detected.
Partition Start Sector End Sector # of Sectors System
/dev/sda1 40 409,639 409,600 EFI System partition
/dev/sda2 409,640 115,752,999 115,343,360 Data partition (Linux)
Drive: sdb _____________________________________________________________________
Disk /dev/sdb: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Partition Boot Start Sector End Sector # of Sectors Id System
/dev/sdb1 2,048 718,847 716,800 7 NTFS / exFAT / HPFS
/dev/sdb2 718,848 882,276,351 881,557,504 7 NTFS / exFAT / HPFS
/dev/sdb3 * 882,276,352 2,930,272,255 2,047,995,904 af HFS / HFS+
"blkid" output: ________________________________________________________________
Device UUID TYPE LABEL
/dev/sda1 39D2-CCE0 vfat
/dev/sda2 0c5d5c14-1e89-44ec-af4d-7b180ed693bc ext4
/dev/sdb1 780CD4910CD44BAE ntfs System Reserved
/dev/sdb2 105CD9745CD95556 ntfs
/dev/sdb3 bb50e1d4-cc4c-43cc-8597-54815366422f ext4
================================ Mount points: =================================
Device Mount_Point Type Options
/dev/sda1 /boot vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
/dev/sda2 / ext4 (rw,noatime,discard,data=ordered)
/dev/sdb3 /home ext4 (rw,relatime,data=ordered)
============================= sda1/grub/grub.cfg: ==============================
# 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 ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${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 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_gpt
insmod ext2
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 0c5d5c14-1e89-44ec-af4d-7b180ed693bc
else
search --no-floppy --fs-uuid --set=root 0c5d5c14-1e89-44ec-af4d-7b180ed693bc
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_input console
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_archlinux ###
menuentry "Arch Linux pkg-linux kernel" --class arch-linux --class arch --class gnu-linux --class gnu --class os {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
fi
set gfxpayload=keep
insmod fat
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Arch Linux pkg-linux kernel ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading Arch Linux pkg-linux kernel initramfs ...'
initrd /initramfs-linux.img
menuentry "Arch Linux pkg-linux kernel (fallback initramfs)" --class arch-linux --class arch --class gnu-linux --class gnu --class os {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
fi
set gfxpayload=keep
insmod fat
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Arch Linux pkg-linux kernel ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading Arch Linux pkg-linux kernel fallback initramfs ...'
initrd /initramfs-linux-fallback.img
### END /etc/grub.d/10_archlinux ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-0c5d5c14-1e89-44ec-af4d-7b180ed693bc' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod fat
set root='hd0,gpt1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Linux linux ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading initial ramdisk ...'
initrd /initramfs-linux.img
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-0c5d5c14-1e89-44ec-af4d-7b180ed693bc' {
menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-0c5d5c14-1e89-44ec-af4d-7b180ed693bc' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod fat
set root='hd0,gpt1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Linux linux ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading initial ramdisk ...'
initrd /initramfs-linux.img
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### 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.
menuentry "Microsoft Windows Vista/7/8 BIOS-MBR" {
insmod part_msdos
insmod ntfs
insmod search_fs_uuid
insmod ntldr
search --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 780CD4910CD44BAE
ntldr /bootmgr
### 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 ###
### BEGIN /etc/grub.d/60_memtest86+ ###
### END /etc/grub.d/60_memtest86+ ###
=================== sda1: Location of files loaded by Grub: ====================
GiB - GB File Fragment(s)
=============================== sda2/etc/fstab: ================================
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/sda2
UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc / ext4 rw,defaults,noatime,discard,data=ordered 0 1
# /dev/sda1
UUID=39D2-CCE0 /boot vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 2
# /dev/sdb3
UUID=bb50e1d4-cc4c-43cc-8597-54815366422f /home ext4 rw,relatime,data=ordered 0 2
=============================== StdErr Messages: ===============================
cat: /tmp/BootInfo-2fUreQzU/Tmp_Log: No such file or directory
No volume groups found
mdadm: No arrays found in config file or automatically
As seen, windows is installed in the MBR of /dev/sdb and grub, using the chainloader should be able to boot it (i guess).
I have the following in my 40-custom.
menuentry "Microsoft Windows Vista/7/8 BIOS-MBR" {
insmod part_msdos
insmod ntfs
insmod search_fs_uuid
insmod ntldr
search --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 780CD4910CD44BAE
ntldr /bootmgr
where the first is  "--hint-bios= ..." is given by
sudo grub-probe --target=hints_string -d /dev/sdb1
and the UUID by
sudo grub-probe --target=fs_uuid -d /dev/sdb1
When I try to boot the above configuration, I get an error saying that "ntldr cannot be found" - and indeed, while I find "ntldr.mod" in "/usr/lib/grub/i386-pc/" I cannot find it in "/usr/lib/grub/x86_64-efi/".
I've also tried getting refind to identify "bootmgr" from windows without success. I guess it does not support NTFS or something.
Anyway, do anyone have any idea of how to get this to work - without reinstalling Windows in EFI-mode?
Thanks in advance,
elt

Answer 1

dieelt wrote:
Hi!
I'm trying to get my secondary drive with Windows 8, installed in MBR-mode to boot using either grub2, refind or any other suitable bootloader. "bootinfoscript" return:
Boot Info Script 0.61 [1 April 2012]
============================= Boot Info Summary: ===============================
=> is installed in the MBR of /dev/sda.
=> Windows is installed in the MBR of /dev/sdb.
sda1: __________________________________________________________________________
File system: vfat
Boot sector type: FAT32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /grub/grub.cfg /efi/arch_grub/grubx64.efi
/efi/refind/refind_x64.efi
sda2: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Arch Linux ()
Boot files: /etc/fstab
sdb1: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /bootmgr /Boot/BCD
sdb2: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /bootmgr /Windows/System32/winload.exe
sdb3: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
============================ Drive/Partition Info: =============================
Drive: sda _____________________________________________________________________
Disk /dev/sda: 55.9 GiB, 60022480896 bytes, 117231408 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Partition Boot Start Sector End Sector # of Sectors Id System
/dev/sda1 1 117,231,407 117,231,407 ee GPT
GUID Partition Table detected.
Partition Start Sector End Sector # of Sectors System
/dev/sda1 40 409,639 409,600 EFI System partition
/dev/sda2 409,640 115,752,999 115,343,360 Data partition (Linux)
Drive: sdb _____________________________________________________________________
Disk /dev/sdb: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Partition Boot Start Sector End Sector # of Sectors Id System
/dev/sdb1 2,048 718,847 716,800 7 NTFS / exFAT / HPFS
/dev/sdb2 718,848 882,276,351 881,557,504 7 NTFS / exFAT / HPFS
/dev/sdb3 * 882,276,352 2,930,272,255 2,047,995,904 af HFS / HFS+
"blkid" output: ________________________________________________________________
Device UUID TYPE LABEL
/dev/sda1 39D2-CCE0 vfat
/dev/sda2 0c5d5c14-1e89-44ec-af4d-7b180ed693bc ext4
/dev/sdb1 780CD4910CD44BAE ntfs System Reserved
/dev/sdb2 105CD9745CD95556 ntfs
/dev/sdb3 bb50e1d4-cc4c-43cc-8597-54815366422f ext4
================================ Mount points: =================================
Device Mount_Point Type Options
/dev/sda1 /boot vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
/dev/sda2 / ext4 (rw,noatime,discard,data=ordered)
/dev/sdb3 /home ext4 (rw,relatime,data=ordered)
============================= sda1/grub/grub.cfg: ==============================
# 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 ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${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 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_gpt
insmod ext2
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 0c5d5c14-1e89-44ec-af4d-7b180ed693bc
else
search --no-floppy --fs-uuid --set=root 0c5d5c14-1e89-44ec-af4d-7b180ed693bc
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_input console
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_archlinux ###
menuentry "Arch Linux pkg-linux kernel" --class arch-linux --class arch --class gnu-linux --class gnu --class os {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
fi
set gfxpayload=keep
insmod fat
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Arch Linux pkg-linux kernel ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading Arch Linux pkg-linux kernel initramfs ...'
initrd /initramfs-linux.img
menuentry "Arch Linux pkg-linux kernel (fallback initramfs)" --class arch-linux --class arch --class gnu-linux --class gnu --class os {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
fi
set gfxpayload=keep
insmod fat
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Arch Linux pkg-linux kernel ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading Arch Linux pkg-linux kernel fallback initramfs ...'
initrd /initramfs-linux-fallback.img
### END /etc/grub.d/10_archlinux ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-0c5d5c14-1e89-44ec-af4d-7b180ed693bc' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod fat
set root='hd0,gpt1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Linux linux ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading initial ramdisk ...'
initrd /initramfs-linux.img
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-0c5d5c14-1e89-44ec-af4d-7b180ed693bc' {
menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-0c5d5c14-1e89-44ec-af4d-7b180ed693bc' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod fat
set root='hd0,gpt1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 39D2-CCE0
else
search --no-floppy --fs-uuid --set=root 39D2-CCE0
fi
echo 'Loading Linux linux ...'
linux /vmlinuz-linux root=UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc rw quiet
echo 'Loading initial ramdisk ...'
initrd /initramfs-linux.img
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### 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.
menuentry "Microsoft Windows Vista/7/8 BIOS-MBR" {
insmod part_msdos
insmod ntfs
insmod search_fs_uuid
insmod ntldr
search --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 780CD4910CD44BAE
ntldr /bootmgr
### 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 ###
### BEGIN /etc/grub.d/60_memtest86+ ###
### END /etc/grub.d/60_memtest86+ ###
=================== sda1: Location of files loaded by Grub: ====================
GiB - GB File Fragment(s)
=============================== sda2/etc/fstab: ================================
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/sda2
UUID=0c5d5c14-1e89-44ec-af4d-7b180ed693bc / ext4 rw,defaults,noatime,discard,data=ordered 0 1
# /dev/sda1
UUID=39D2-CCE0 /boot vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 2
# /dev/sdb3
UUID=bb50e1d4-cc4c-43cc-8597-54815366422f /home ext4 rw,relatime,data=ordered 0 2
=============================== StdErr Messages: ===============================
cat: /tmp/BootInfo-2fUreQzU/Tmp_Log: No such file or directory
No volume groups found
mdadm: No arrays found in config file or automatically
As seen, windows is installed in the MBR of /dev/sdb and grub, using the chainloader should be able to boot it (i guess).
I have the following in my 40-custom.
menuentry "Microsoft Windows Vista/7/8 BIOS-MBR" {
insmod part_msdos
insmod ntfs
insmod search_fs_uuid
insmod ntldr
search --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 780CD4910CD44BAE
ntldr /bootmgr
where the first is  "--hint-bios= ..." is given by
sudo grub-probe --target=hints_string -d /dev/sdb1
and the UUID by
sudo grub-probe --target=fs_uuid -d /dev/sdb1
When I try to boot the above configuration, I get an error saying that "ntldr cannot be found" - and indeed, while I find "ntldr.mod" in "/usr/lib/grub/i386-pc/" I cannot find it in "/usr/lib/grub/x86_64-efi/".
I've also tried getting refind to identify "bootmgr" from windows without success. I guess it does not support NTFS or something.
Anyway, do anyone have any idea of how to get this to work - without reinstalling Windows in EFI-mode?
Thanks in advance,
elt
UEFI GRUB(2) does not support booting BIOS boot loaders in non-Apple systems. For Apple Macs that support exists in form of 'appleloader' grub command. You might have better luck with rEFInd bios boot support but as per its author Rod Smith (srs5694) even that support is severely limited http://rodsbooks.com/refind/using.html#legacy .
You 40_custom is correct but that will work only in bios grub(2), not in uefi grub(2). 'ntldr' grub module is specific to bios grub(2).
Last edited by the.ridikulus.rat (2014-04-13 20:09:25)