doc/usage/cmd/bootm.rst - u-boot - Git at Google

 .. SPDX-License-Identifier: GPL-2.0+

 .. index::
    single: bootm (command)

 bootm command
 =============

 Synopsis
 --------

 ::

     bootm [fit_addr]#<conf>[#extra-conf]
     bootm [[fit_addr]:<os_subimg>] [[<fit_addr2>]:<rd_subimg2>] [[<fit_addr3>]:<fdt_subimg>]

     bootm <addr1> [[<addr2> [<addr3>]]    # Legacy boot

 Description
 -----------

 The *bootm* command is used to boot an Operating System. It has a large number
 of options depending on what needs to be booted.

 Note that the second form supports the first and/or second arguments to be
 omitted by using a hyphen '-' instead.

 fit_addr / fit_addr2 / fit_addr3
     address of FIT to boot, defaults to CONFIG_SYS_LOAD_ADDR. See notes below.

 conf
     configuration unit to boot (must be preceded by hash '#')

 extra-conf
     extra configuration to boot. This is supported only for additional
     devicetree overlays to apply on the base device tree supplied by the first
     configuration unit.

 os_subimg
     OS sub-image to boot (must be preceded by colon ':')

 rd_subimg
     ramdisk sub-image to boot. Use a hyphen '-' if there is no ramdisk but an
     FDT is needed.

 fdt_subimg
     FDT sub-image to boot

 See below for legacy boot. Booting using :doc:`../fit/index` is recommended.

 Note on current image address
 -----------------------------

 When bootm is called without arguments, the image at current image address is
 booted. The current image address is the address set most recently by a load
 command, etc, and is by default equal to CONFIG_SYS_LOAD_ADDR. For example,
 consider the following commands::

     tftp 200000 /tftpboot/kernel
     bootm
     # Last command is equivalent to:
     # bootm 200000

 As shown above, with FIT the address portion of any argument
 can be omitted. If <addr3> is omitted, then it is assumed that image at
 <addr2> should be used. Similarly, when <addr2> is omitted, it is assumed that
 image at <addr1> should be used. If <addr1> is omitted, it is assumed that the
 current image address is to be used. For example, consider the following
 commands::

     tftp 200000 /tftpboot/uImage
     bootm :kernel-1
     # Last command is equivalent to:
     # bootm 200000:kernel-1

     tftp 200000 /tftpboot/uImage
     bootm 400000:kernel-1 :ramdisk-1
     # Last command is equivalent to:
     # bootm 400000:kernel-1 400000:ramdisk-1

     tftp 200000 /tftpboot/uImage
     bootm :kernel-1 400000:ramdisk-1 :fdt-1
     # Last command is equivalent to:
     # bootm 200000:kernel-1 400000:ramdisk-1 400000:fdt-1


 Legacy boot
 -----------

 U-Boot supports a legacy image format, enabled by `CONFIG_LEGACY_IMAGE_FORMAT`.
 This is not recommended as it is quite limited and insecure. Use
 :doc:`../fit/index` instead. It is documented here for old boards which still
 use it.

 Arguments are:

 addr1
     address of legacy image to boot. If the image includes a second component
     (ramdisk) it is used as well, unless the second parameter is hyphen '-'.

 addr2
     address of legacy image to use as ramdisk

 addr3
     address of legacy image to use as FDT


 Example syntax
 --------------

 This section provides various examples of possible usage::

     1.  bootm       /* boot image at the current address, equivalent to 2,3,8 */

 This is equivalent to cases 2, 3 or 8, depending on the type of image at
 the current image address.

 Boot method: see cases 2,3,8

 Legacy uImage syntax
 ~~~~~~~~~~~~~~~~~~~~

 ::

     2.  bootm <addr1>            /* single image at <addr1> */

 Boot kernel image located at <addr1>.

 Boot method: non-FDT

 ::

     3.  bootm <addr1>            /* multi-image at <addr1>  */

 First and second components of the image at <addr1> are assumed to be a
 kernel and a ramdisk, respectively. The kernel is booted with initrd loaded
 with the ramdisk from the image.

 Boot method: depends on the number of components at <addr1>, and on whether
 U-Boot is compiled with OF support, which it should be.

     ==================== ======================== ========================
     Configuration        2 components             3 components
                          (kernel, initrd)         (kernel, initrd, fdt)
     ==================== ======================== ========================
     #ifdef CONFIG_OF_*                   non-FDT                     FDT
     #ifndef CONFIG_OF_*                  non-FDT                 non-FDT
     ==================== ======================== ========================

 ::

     4.  bootm <addr1> -            /* multi-image at <addr1>  */

 Similar to case 3, but the kernel is booted without initrd.  Second
 component of the multi-image is irrelevant (it can be a dummy, 1-byte file).

 Boot method: see case 3

 ::

     5.  bootm <addr1> <addr2>        /* single image at <addr1> */

 Boot kernel image located at <addr1> with initrd loaded with ramdisk
 from the image at <addr2>.

 Boot method: non-FDT

 ::

     6.  bootm <addr1> <addr2> <addr3>   /* single image at <addr1> */

 <addr1> is the address of a kernel image, <addr2> is the address of a
 ramdisk image, and <addr3> is the address of a FDT binary blob.  Kernel is
 booted with initrd loaded with ramdisk from the image at <addr2>.

 Boot method: FDT

 ::

     7.  bootm <addr1> -      <addr3>   /* single image at <addr1> */

 <addr1> is the address of a kernel image and <addr3> is the address of
 a FDT binary blob. Kernel is booted without initrd.

 Boot method: FDT

 FIT syntax
 ~~~~~~~~~~

 ::

     8.  bootm <addr1>

 Image at <addr1> is assumed to contain a default configuration, which
 is booted.

 Boot method: FDT or non-FDT, depending on whether the default configuration
 defines FDT

 ::

     9.  bootm [<addr1>]:<subimg1>

 Similar to case 2: boot kernel stored in <subimg1> from the image at
 address <addr1>.

 Boot method: non-FDT

 ::

     10. bootm [<addr1>]#<conf>[#<extra-conf[#...]]

 Boot configuration <conf> from the image at <addr1>.

 Boot method: FDT or non-FDT, depending on whether the configuration given
 defines FDT

 ::

     11. bootm [<addr1>]:<subimg1> [<addr2>]:<subimg2>

 Equivalent to case 5: boot kernel stored in <subimg1> from the image
 at <addr1> with initrd loaded with ramdisk <subimg2> from the image at
 <addr2>.

 Boot method: non-FDT

 ::

     12. bootm [<addr1>]:<subimg1> [<addr2>]:<subimg2> [<addr3>]:<subimg3>

 Equivalent to case 6: boot kernel stored in <subimg1> from the image
 at <addr1> with initrd loaded with ramdisk <subimg2> from the image at
 <addr2>, and pass FDT blob <subimg3> from the image at <addr3>.

 Boot method: FDT

 ::

     13. bootm [<addr1>]:<subimg1> [<addr2>]:<subimg2> <addr3>

 Similar to case 12, the difference being that <addr3> is the address
 of FDT binary blob that is to be passed to the kernel.

 Boot method: FDT

 ::

     14. bootm [<addr1>]:<subimg1> -              [<addr3>]:<subimg3>

 Equivalent to case 7: boot kernel stored in <subimg1> from the image
 at <addr1>, without initrd, and pass FDT blob <subimg3> from the image at
 <addr3>.

 Boot method: FDT

     15. bootm [<addr1>]:<subimg1> -              <addr3>

 Similar to case 14, the difference being that <addr3> is the address
 of the FDT binary blob that is to be passed to the kernel.

 Boot method: FDT


 Example
 -------

 boot kernel "kernel-1" stored in a new uImage located at 200000::

     bootm 200000:kernel-1

 boot configuration "cfg-1" from a new uImage located at 200000::

     bootm 200000#cfg-1

 boot configuration "cfg-1" with extra "cfg-2" from a new uImage located
 at 200000::

     bootm 200000#cfg-1#cfg-2

 boot "kernel-1" from a new uImage at 200000 with initrd "ramdisk-2" found in
 some other new uImage stored at address 800000::

     bootm 200000:kernel-1 800000:ramdisk-2

 boot "kernel-2" from a new uImage at 200000, with initrd "ramdisk-1" and FDT
 "fdt-1", both stored in some other new uImage located at 800000::

     bootm 200000:kernel-1 800000:ramdisk-1 800000:fdt-1

 boot kernel "kernel-2" with initrd "ramdisk-2", both stored in a new uImage
 at address 200000, with a raw FDT blob stored at address 600000::

     bootm 200000:kernel-2 200000:ramdisk-2 600000

 boot kernel "kernel-2" from new uImage at 200000 with FDT "fdt-1" from the
 same new uImage::

     bootm 200000:kernel-2 - 200000:fdt-1

 .. sectionauthor:: Bartlomiej Sieka <tur@semihalf.com>
 .. sectionauthor:: Simon Glass <sjg@chromium.org>
	.. SPDX-License-Identifier: GPL-2.0+

	.. index::
	single: bootm (command)

	bootm command
	=============

	Synopsis
	--------

	::

	bootm [fit_addr]#<conf>[#extra-conf]
	bootm [[fit_addr]:<os_subimg>] [[<fit_addr2>]:<rd_subimg2>] [[<fit_addr3>]:<fdt_subimg>]

	bootm <addr1> [[<addr2> [<addr3>]] # Legacy boot

	Description
	-----------

	The bootm command is used to boot an Operating System. It has a large number
	of options depending on what needs to be booted.

	Note that the second form supports the first and/or second arguments to be
	omitted by using a hyphen '-' instead.

	fit_addr / fit_addr2 / fit_addr3
	address of FIT to boot, defaults to CONFIG_SYS_LOAD_ADDR. See notes below.

	conf
	configuration unit to boot (must be preceded by hash '#')

	extra-conf
	extra configuration to boot. This is supported only for additional
	devicetree overlays to apply on the base device tree supplied by the first
	configuration unit.

	os_subimg
	OS sub-image to boot (must be preceded by colon ':')

	rd_subimg
	ramdisk sub-image to boot. Use a hyphen '-' if there is no ramdisk but an
	FDT is needed.

	fdt_subimg
	FDT sub-image to boot

	See below for legacy boot. Booting using :doc:`../fit/index` is recommended.

	Note on current image address
	-----------------------------

	When bootm is called without arguments, the image at current image address is
	booted. The current image address is the address set most recently by a load
	command, etc, and is by default equal to CONFIG_SYS_LOAD_ADDR. For example,
	consider the following commands::

	tftp 200000 /tftpboot/kernel
	bootm
	# Last command is equivalent to:
	# bootm 200000

	As shown above, with FIT the address portion of any argument
	can be omitted. If <addr3> is omitted, then it is assumed that image at
	<addr2> should be used. Similarly, when <addr2> is omitted, it is assumed that
	image at <addr1> should be used. If <addr1> is omitted, it is assumed that the
	current image address is to be used. For example, consider the following
	commands::

	tftp 200000 /tftpboot/uImage
	bootm :kernel-1
	# Last command is equivalent to:
	# bootm 200000:kernel-1

	tftp 200000 /tftpboot/uImage
	bootm 400000:kernel-1 :ramdisk-1
	# Last command is equivalent to:
	# bootm 400000:kernel-1 400000:ramdisk-1

	tftp 200000 /tftpboot/uImage
	bootm :kernel-1 400000:ramdisk-1 :fdt-1
	# Last command is equivalent to:
	# bootm 200000:kernel-1 400000:ramdisk-1 400000:fdt-1


	Legacy boot
	-----------

	U-Boot supports a legacy image format, enabled by `CONFIG_LEGACY_IMAGE_FORMAT`.
	This is not recommended as it is quite limited and insecure. Use
	:doc:`../fit/index` instead. It is documented here for old boards which still
	use it.

	Arguments are:

	addr1
	address of legacy image to boot. If the image includes a second component
	(ramdisk) it is used as well, unless the second parameter is hyphen '-'.

	addr2
	address of legacy image to use as ramdisk

	addr3
	address of legacy image to use as FDT


	Example syntax
	--------------

	This section provides various examples of possible usage::

	1. bootm /* boot image at the current address, equivalent to 2,3,8 */

	This is equivalent to cases 2, 3 or 8, depending on the type of image at
	the current image address.

	Boot method: see cases 2,3,8

	Legacy uImage syntax
	~~~~~~~~~~~~~~~~~~~~

	::

	2. bootm <addr1> /* single image at <addr1> */

	Boot kernel image located at <addr1>.

	Boot method: non-FDT

	::

	3. bootm <addr1> /* multi-image at <addr1> */

	First and second components of the image at <addr1> are assumed to be a
	kernel and a ramdisk, respectively. The kernel is booted with initrd loaded
	with the ramdisk from the image.

	Boot method: depends on the number of components at <addr1>, and on whether
	U-Boot is compiled with OF support, which it should be.

	==================== ======================== ========================
	Configuration 2 components 3 components
	(kernel, initrd) (kernel, initrd, fdt)
	==================== ======================== ========================
	#ifdef CONFIG_OF_* non-FDT FDT
	#ifndef CONFIG_OF_* non-FDT non-FDT
	==================== ======================== ========================

	::

	4. bootm <addr1> - /* multi-image at <addr1> */

	Similar to case 3, but the kernel is booted without initrd. Second
	component of the multi-image is irrelevant (it can be a dummy, 1-byte file).

	Boot method: see case 3

	::

	5. bootm <addr1> <addr2> /* single image at <addr1> */

	Boot kernel image located at <addr1> with initrd loaded with ramdisk
	from the image at <addr2>.

	Boot method: non-FDT

	::

	6. bootm <addr1> <addr2> <addr3> /* single image at <addr1> */

	<addr1> is the address of a kernel image, <addr2> is the address of a
	ramdisk image, and <addr3> is the address of a FDT binary blob. Kernel is
	booted with initrd loaded with ramdisk from the image at <addr2>.

	Boot method: FDT

	::

	7. bootm <addr1> - <addr3> /* single image at <addr1> */

	<addr1> is the address of a kernel image and <addr3> is the address of
	a FDT binary blob. Kernel is booted without initrd.

	Boot method: FDT

	FIT syntax
	~~~~~~~~~~

	::

	8. bootm <addr1>

	Image at <addr1> is assumed to contain a default configuration, which
	is booted.

	Boot method: FDT or non-FDT, depending on whether the default configuration
	defines FDT

	::

	9. bootm [<addr1>]:<subimg1>

	Similar to case 2: boot kernel stored in <subimg1> from the image at
	address <addr1>.

	Boot method: non-FDT

	::

	10. bootm [<addr1>]#<conf>[#<extra-conf[#...]]

	Boot configuration <conf> from the image at <addr1>.

	Boot method: FDT or non-FDT, depending on whether the configuration given
	defines FDT

	::

	11. bootm [<addr1>]:<subimg1> [<addr2>]:<subimg2>

	Equivalent to case 5: boot kernel stored in <subimg1> from the image
	at <addr1> with initrd loaded with ramdisk <subimg2> from the image at
	<addr2>.

	Boot method: non-FDT

	::

	12. bootm [<addr1>]:<subimg1> [<addr2>]:<subimg2> [<addr3>]:<subimg3>

	Equivalent to case 6: boot kernel stored in <subimg1> from the image
	at <addr1> with initrd loaded with ramdisk <subimg2> from the image at
	<addr2>, and pass FDT blob <subimg3> from the image at <addr3>.

	Boot method: FDT

	::

	13. bootm [<addr1>]:<subimg1> [<addr2>]:<subimg2> <addr3>

	Similar to case 12, the difference being that <addr3> is the address
	of FDT binary blob that is to be passed to the kernel.

	Boot method: FDT

	::

	14. bootm [<addr1>]:<subimg1> - [<addr3>]:<subimg3>

	Equivalent to case 7: boot kernel stored in <subimg1> from the image
	at <addr1>, without initrd, and pass FDT blob <subimg3> from the image at
	<addr3>.

	Boot method: FDT

	15. bootm [<addr1>]:<subimg1> - <addr3>

	Similar to case 14, the difference being that <addr3> is the address
	of the FDT binary blob that is to be passed to the kernel.

	Boot method: FDT



	Example
	-------

	boot kernel "kernel-1" stored in a new uImage located at 200000::

	bootm 200000:kernel-1

	boot configuration "cfg-1" from a new uImage located at 200000::

	bootm 200000#cfg-1

	boot configuration "cfg-1" with extra "cfg-2" from a new uImage located
	at 200000::

	bootm 200000#cfg-1#cfg-2

	boot "kernel-1" from a new uImage at 200000 with initrd "ramdisk-2" found in
	some other new uImage stored at address 800000::

	bootm 200000:kernel-1 800000:ramdisk-2

	boot "kernel-2" from a new uImage at 200000, with initrd "ramdisk-1" and FDT
	"fdt-1", both stored in some other new uImage located at 800000::

	bootm 200000:kernel-1 800000:ramdisk-1 800000:fdt-1

	boot kernel "kernel-2" with initrd "ramdisk-2", both stored in a new uImage
	at address 200000, with a raw FDT blob stored at address 600000::

	bootm 200000:kernel-2 200000:ramdisk-2 600000

	boot kernel "kernel-2" from new uImage at 200000 with FDT "fdt-1" from the
	same new uImage::

	bootm 200000:kernel-2 - 200000:fdt-1

	.. sectionauthor:: Bartlomiej Sieka <tur@semihalf.com>
	.. sectionauthor:: Simon Glass <sjg@chromium.org>