mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 02:33:07 +00:00
35ed599f43
Reformat and rewrite the documentation for this command. This is a complicated command, so further improvements are welcome. Signed-off-by: Simon Glass <sjg@chromium.org>
300 lines
8 KiB
ReStructuredText
300 lines
8 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
|
|
|
|
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>
|