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author | Ahmad Fatoum <ahmad@a3f.at> | 2022-02-06 00:19:30 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2022-02-07 09:36:27 +0100 |
commit | cd2f8d107728a919bddca09cf744c4c87463023b (patch) | |
tree | 026b95f72c98c9a35aa9d1e0f387fd1aa02072dc /Documentation/user/barebox.rst | |
parent | 4a5c42b878db45a001d0ef93d2f9f5b6f9a5b78f (diff) | |
download | barebox-cd2f8d107728a919bddca09cf744c4c87463023b.tar.gz barebox-cd2f8d107728a919bddca09cf744c4c87463023b.tar.xz |
Documentation: user: barebox: mention generic dt 2nd stage support
Most users interested in chainloading barebox will probably want to use
the generic DT format for that: It will pass the checks the boot command
may have and it will ensure the system is in the correct state, e.g.
that caches are disabled.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Link: https://lore.barebox.org/20220205231930.2948516-2-ahmad@a3f.at
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation/user/barebox.rst')
-rw-r--r-- | Documentation/user/barebox.rst | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/Documentation/user/barebox.rst b/Documentation/user/barebox.rst index 8634d8e48e..4abcf79c6d 100644 --- a/Documentation/user/barebox.rst +++ b/Documentation/user/barebox.rst @@ -203,9 +203,21 @@ Starting barebox Bringing barebox to a board for the first time is highly board specific, see your board documentation for initial bringup. -barebox binaries are, where possible, designed to be startable second stage from another -bootloader. For example, if you have U-Boot running on your board, you can start barebox -with U-Boot's ``bootm`` command: +For ARM and RISC-V, the barebox build can additionally generate a generic DT image +(enable ``CONFIG_BOARD_ARM_GENERIC_DT`` or ``CONFIG_BOARD_RISCV_GENERIC_DT``, +respectively). The resulting ``images/barebox-dt-2nd.img`` can be booted just +like a Linux kernel that is passed an external device tree. For example: + +.. code-block:: console + + U-Boot: tftp $kernel_addr barebox-dt-2nd.img + U-Boot: tftp $fdt_addr my-board.dtb + U-Boot: booti $kernel_addr - $fdt_addr + +For non-DT enabled-bootloaders or other architectures, often the normal barebox +binaries can also be used as they are designed to be startable second stage +from another bootloader, where possible. For example, if you have U-Boot running +on your board, you can start barebox with U-Boot's ``bootm`` command: .. code-block:: console |