On Sun, Feb 06, 2022 at 12:19:30AM +0100, Ahmad Fatoum wrote: > 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@xxxxxx> > --- > Documentation/user/barebox.rst | 18 +++++++++++++++--- > 1 file changed, 15 insertions(+), 3 deletions(-) > > diff --git a/Documentation/user/barebox.rst b/Documentation/user/barebox.rst > index 8634d8e48eef..4abcf79c6d2a 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: Hm, that seems wrong. U-Boot's bootm command starts images generated with U-Boot's mkimage tool. A raw barebox image cannot be started with this command, one has to create a uImage from it before. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
