Added GRUB docs, Added netboot.xyz
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boot/grub/persistent/docs/21_supported_boot_targets
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boot/grub/persistent/docs/21_supported_boot_targets
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21 Supported boot targets
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*************************
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X86 support is summarised in the following table. "Yes" means that the
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kernel works on the given platform, "crashes" means an early kernel
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crash which we hope will be fixed by concerned kernel developers. "no"
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means GRUB doesn't load the given kernel on a given platform.
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"headless" means that the kernel works but lacks console drivers (you
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can still use serial or network console). In case of "no" and "crashes"
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the reason is given in footnote.
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BIOS Coreboot
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BIOS chainloading yes no (1)
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NTLDR yes no (1)
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Plan9 yes no (1)
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Freedos yes no (1)
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FreeBSD bootloader yes crashes (1)
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32-bit kFreeBSD yes crashes (5)
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64-bit kFreeBSD yes crashes (5)
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32-bit kNetBSD yes crashes (1)
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64-bit kNetBSD yes crashes
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32-bit kOpenBSD yes yes
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64-bit kOpenBSD yes yes
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Multiboot yes yes
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Multiboot2 yes yes
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32-bit Linux (legacy protocol) yes no (1)
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64-bit Linux (legacy protocol) yes no (1)
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32-bit Linux (modern protocol) yes yes
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64-bit Linux (modern protocol) yes yes
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32-bit XNU yes ?
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64-bit XNU yes ?
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32-bit EFI chainloader no (2) no (2)
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64-bit EFI chainloader no (2) no (2)
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Appleloader no (2) no (2)
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Multiboot Qemu
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BIOS chainloading no (1) no (1)
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NTLDR no (1) no (1)
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Plan9 no (1) no (1)
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FreeDOS no (1) no (1)
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FreeBSD bootloader crashes (1) crashes (1)
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32-bit kFreeBSD crashes (5) crashes (5)
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64-bit kFreeBSD crashes (5) crashes (5)
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32-bit kNetBSD crashes (1) crashes (1)
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64-bit kNetBSD yes yes
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32-bit kOpenBSD yes yes
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64-bit kOpenBSD yes yes
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Multiboot yes yes
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Multiboot2 yes yes
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32-bit Linux (legacy protocol) no (1) no (1)
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64-bit Linux (legacy protocol) no (1) no (1)
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32-bit Linux (modern protocol) yes yes
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64-bit Linux (modern protocol) yes yes
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32-bit XNU ? ?
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64-bit XNU ? ?
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32-bit EFI chainloader no (2) no (2)
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64-bit EFI chainloader no (2) no (2)
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Appleloader no (2) no (2)
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ia32 EFI amd64 EFI
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BIOS chainloading no (1) no (1)
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NTLDR no (1) no (1)
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Plan9 no (1) no (1)
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FreeDOS no (1) no (1)
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FreeBSD bootloader crashes (1) crashes (1)
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32-bit kFreeBSD headless headless
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64-bit kFreeBSD headless headless
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32-bit kNetBSD crashes (1) crashes (1)
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64-bit kNetBSD yes yes
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32-bit kOpenBSD headless headless
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64-bit kOpenBSD headless headless
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Multiboot yes yes
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Multiboot2 yes yes
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32-bit Linux (legacy protocol) no (1) no (1)
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64-bit Linux (legacy protocol) no (1) no (1)
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32-bit Linux (modern protocol) yes yes
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64-bit Linux (modern protocol) yes yes
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32-bit XNU yes yes
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64-bit XNU yes (4) yes
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32-bit EFI chainloader yes no (3)
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64-bit EFI chainloader no (3) yes
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Appleloader yes yes
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ia32 IEEE1275
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BIOS chainloading no (1)
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NTLDR no (1)
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Plan9 no (1)
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FreeDOS no (1)
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FreeBSD bootloader crashes (1)
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32-bit kFreeBSD crashes (5)
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64-bit kFreeBSD crashes (5)
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32-bit kNetBSD crashes (1)
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64-bit kNetBSD ?
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32-bit kOpenBSD ?
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64-bit kOpenBSD ?
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Multiboot ?
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Multiboot2 ?
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32-bit Linux (legacy protocol) no (1)
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64-bit Linux (legacy protocol) no (1)
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32-bit Linux (modern protocol) ?
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64-bit Linux (modern protocol) ?
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32-bit XNU ?
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64-bit XNU ?
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32-bit EFI chainloader no (2)
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64-bit EFI chainloader no (2)
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Appleloader no (2)
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1. Requires BIOS
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2. EFI only
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3. 32-bit and 64-bit EFI have different structures and work in
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different CPU modes so it's not possible to chainload 32-bit
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bootloader on 64-bit platform and vice-versa
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4. Some modules may need to be disabled
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5. Requires ACPI
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PowerPC, IA64 and Sparc64 ports support only Linux. MIPS port
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supports Linux and multiboot2.
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21.1 Boot tests
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===============
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As you have seen in previous chapter the support matrix is pretty big
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and some of the configurations are only rarely used. To ensure the
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quality bootchecks are available for all x86 targets except EFI
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chainloader, Appleloader and XNU. All x86 platforms have bootcheck
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facility except ieee1275. Multiboot, multiboot2, BIOS chainloader,
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ntldr and freebsd-bootloader boot targets are tested only with a fake
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kernel images. Only Linux is tested among the payloads using Linux
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protocols.
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Following variables must be defined:
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GRUB_PAYLOADS_DIR directory containing the required kernels
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GRUB_CBFSTOOL cbfstool from Coreboot package (for coreboot
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platform only)
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GRUB_COREBOOT_ROM empty Coreboot ROM
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GRUB_QEMU_OPTS additional options to be supplied to QEMU
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Required files are:
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kfreebsd_env.i386 32-bit kFreeBSD device hints
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kfreebsd.i386 32-bit FreeBSD kernel image
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kfreebsd.x86_64, same from 64-bit kFreeBSD
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kfreebsd_env.x86_64
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knetbsd.i386 32-bit NetBSD kernel image
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knetbsd.miniroot.i386 32-bit kNetBSD miniroot.kmod.
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knetbsd.x86_64, same from 64-bit kNetBSD
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knetbsd.miniroot.x86_64
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kopenbsd.i386 32-bit OpenBSD kernel bsd.rd image
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kopenbsd.x86_64 same from 64-bit kOpenBSD
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linux.i386 32-bit Linux
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linux.x86_64 64-bit Linux
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