[SOLVED] Export grub entry from treusted grub android to grub pc

pedropt · 11-22-2021, 12:36 PM

Hi everyone i am having an issue trying to add my android hdd boot to grub-pc config file where i have my linux and windows .
Sadly osprober does not catch android installation on other disk , if i want to launch android from that disk i have to boot computer from that hdd other wise it will not work .

The current config on trusted grub menu in android hdd is :

Quote:

default=0
timeout=6
splashimage=/grub/android-x86.xpm.gz
root (hd0,0)

title Android-x86 7.1-r5
kernel /android-7.1-r5/kernel quiet root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug SRC=/android-7.1-r5
initrd /android-7.1-r5/initrd.img

title Android-x86 7.1-r5 (Debug mode)
kernel /android-7.1-r5/kernel root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug DEBUG=2 SRC=/android-7.1-r5
initrd /android-7.1-r5/initrd.img

title Android-x86 7.1-r5 (Debug nomodeset)
kernel /android-7.1-r5/kernel nomodeset root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug DEBUG=2 SRC=/android-7.1-r5
initrd /android-7.1-r5/initrd.img

title Android-x86 7.1-r5 (Debug video=LVDS-1:d)
kernel /android-7.1-r5/kernel video=LVDS-1:d root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug DEBUG=2 SRC=/android-7.1-r5
initrd /android-7.1-r5/initrd.img

however

in my grub-pc i have :

Quote:

.... more entries above

menuentry 'Kali GNU/Linux, with Linux 5.6.0-kali1-amd64 (recovery mode)' --class kali --class gnu-linux --class gnu >
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_msdos
insmod ext2
set root='hd4,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd4,msdos5 --hint-efi=hd4,msdos5 --hint-baremetal=ahci>
else
search --no-floppy --fs-uuid --set=root 31365657-7bbe-4808-98aa-2ee71f8d377b
fi
echo 'Loading Linux 5.6.0-kali1-amd64 ...'
linux /boot/vmlinuz-5.6.0-kali1-amd64 root=UUID=31365657-7bbe-4808-98aa-2ee71f8d377b ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-5.6.0-kali1-amd64
}
}

### 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 ###
menuentry 'Windows 7 (on /dev/sdb1)' --class windows --class os $menuentry_id_option 'osprober-chain-0CAB802F0A7DDDAC' {
insmod part_msdos
insmod ntfs
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1>
else
search --no-floppy --fs-uuid --set=root 0CAB802F0A7DDDAC
fi
parttool ${root} hidden-
chainloader +1
}

My question is , how to i export the startup line from trusted grub to grub-pc and make it boot to android , copy and paste does not work , i have tried grub customizer without sucess .

Any idea ?
Thanks

shruggy · 11-22-2021, 12:45 PM

Of course, copy and paste doesn't work. The grub menu on Android HDD is in GRUB Legacy format, while your grub-pc is GRUB 2. See grub-menulst2cfg.

pedropt · 11-22-2021, 01:11 PM

thanks for the tip however i am stuck because there are many unsupported and needed lines to run the android .

Quote:

set root='(hd0,1)'; set legacy_hdbias='0'

menuentry 'Android-x86 7.1-r5' {
# Unsupported legacy command: kernel /android-7.1-r5/kernel quiet root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug SRC=/android-7.1-r5

# Unsupported legacy command: initrd /android-7.1-r5/initrd.img

}

menuentry 'Android-x86 7.1-r5 (Debug mode)' {
# Unsupported legacy command: kernel /android-7.1-r5/kernel root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug DEBUG=2 SRC=/android-7.1-r5

# Unsupported legacy command: initrd /android-7.1-r5/initrd.img

}

menuentry 'Android-x86 7.1-r5 (Debug nomodeset)' {
# Unsupported legacy command: kernel /android-7.1-r5/kernel nomodeset root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug DEBUG=2 SRC=/android-7.1-r5

# Unsupported legacy command: initrd /android-7.1-r5/initrd.img

}

menuentry 'Android-x86 7.1-r5 (Debug video=LVDS-1:d)' {
# Unsupported legacy command: kernel /android-7.1-r5/kernel video=LVDS-1:d root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug DEBUG=2 SRC=/android-7.1-r5

# Unsupported legacy command: initrd /android-7.1-r5/initrd.img

}

However even if i install grub-legacy and remove grub-pc , pasting the lines also does not work .

The grub on android hdd is the trusted grub 1.1.5
https://sourceforge.net/projects/tru...tedGRUB-1.1.5/

I tried to install it here and was unable because i got error "gcc unable to compile executables" despite that i tried multiples versions of gcc and always got the same error .

colorpurple21859 · 11-22-2021, 02:18 PM

It will be along the lines of this:

Code:

menuentry 'Android-x86 7.1-r5'{
set root=(hd1,1)
linux /android-7.1-r5/kernel quiet root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug SRC=/android-7.1-r5
initrd /android-7.1-r5/initrd.img
}

added to /etc/grub.d/40_custom and rerun update-grub.
may have to change hd1 in the 'set root=" line to something else if the android disk isn't the second drive. grub2 counts drives from 0 and partitions from 1.

The other option is dhainloading

Code:

menuentry 'Android-x86 7.1-r5'{
set root=(hd1)
chainloader +1
}

pedropt · 11-22-2021, 03:04 PM

Thank you colorpurple21859 , i got it working .
in my case the hdd was sda and 1st partition , so the output for /etc/grub.d/40_custom was :

Quote:

menuentry "Android X86 7.1 r5"{
set root='(hd0,1)'
linux /android-7.1-r5/kernel quiet root=/dev/ram0 androidboot.selinux=permissive buildvariant=userdebug SRC=/android-7.1-r5
initrd /android-7.1-r5/initrd.img
}

Thanks a lot for the help , alone i would never get it working .

colorpurple21859 · 11-22-2021, 03:14 PM

glad to help