Install android x86 Jelly Bean on my eeepc with qemu

In fact is an reinstall , i had 2.3 ginger in dual boot with debian sid on my eeepc and i wanted to do an upgrade , the issue is that i don't have a usb stick to boot from it so i took another route

I have installed qemu and then downloaded the 4.2 iso from android x86 site and started this way to detect partitions on the main drive

qemu -boot d -cdrom android-x86-4.2-20130228.iso -hda /dev/sda

format the partition already prepared in my case 15G /dev/sda4 also do not install grub if you want to modify it manually from debian partition

After the install is finished you need to test it first that it works
i mount /dev/sda4 to see the dir structure

so i have modified
/etc/grub.d/40_custom
this way

menuentry "Android-x86 4.2" {
set root=(hd0,4)
linux /android-4.2-test/kernel quiet root=/dev/ram0 androidboot_hardware=eeepc acpi_sleep=s3_bios,s3_mode SRC=/android-4.2-test DATA=
initrd /android-4.2-test/initrd.img
}

sudo update-grub2

and restart