Debian on Macbook 2,1

README.txt

# see https://wiki.debian.org/InstallingDebianOn/Apple/MacBook/2-1

# use debian jessie as host (recent grub don't support target/efi-directory)
$ apt-get install grub-efi-ia32-bin p7zip-full dosfstools

# format usb as DOS + W95 FAT32 partition + vfat filesystem
# mount usb as /mnt/usb

# buster 32 bits
$ wget http://ftp.de.debian.org/debian/dists/buster/main/installer-i386/current/images/netboot/mini.iso
# buster 64 bits
$ wget http://ftp.de.debian.org/debian/dists/buster/main/installer-amd64/current/images/netboot/mini.iso

$ grub-install --target=i386-efi --efi-directory=/mnt/usb --boot-directory=/mnt/usb/boot --bootloader-id=boot --removable
$ nano /mnt/usb/boot/grub/grub.cfg
if loadfont /boot/grub/fonts/unicode.pf2 ; then
    set gfxmode=800x600
    insmod efi_gop
    insmod efi_uga
    insmod video_bochs
    insmod video_cirrus
    insmod gfxterm
    insmod png
    terminal_output gfxterm
fi
linux (hd0,msdos1)/linux
initrd (hd0,msdos1)/initrd.gz
boot

# extract linux initrd.gz
$ 7z x mini.iso linux initrd.gz -o/mnt/usb
# copy iso
$ cp mini.iso /mnt/usb