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boot: pxe_utils: skip fdt setup in case legacy kernel is booted

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Currently, if boot with extlinux.conf and do not set the fdt
U-Boot will provide its own device tree. This behavior is
beneficial if the U-Boot device tree is in sync with Linux,
but it totally halts the booting of pre-dtb kernels (3.4 for
example) since it uses ATAGs. To fix this, pass `-` in the
fdt extlinux field as a signal that no tree should be used.

Suggested-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Tested-by: Jethro Bull <jethrob@hotmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
This commit is contained in:
Svyatoslav Ryhel
2024-01-25 22:16:54 +02:00
committed by Tom Rini
parent 172e32add3
commit c95e948870
2 changed files with 28 additions and 5 deletions
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6
doc/develop/distro.rst
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@@ -81,6 +81,12 @@ as specified at `Boot Loader Specification`_:
* Does not document the fdtdir option, which automatically selects the DTB to
pass to the kernel.
* If no fdt/fdtdir is provided, the U-Boot will pass its own currently used
device tree.
* If ``-`` is passed as fdt argument and ``CONFIG_SUPPORT_PASSING_ATAGS`` is
enabled, then no device tree will be used (legacy booting / pre-dtb kernel).
See also doc/README.pxe under 'pxe file format'.
One example extlinux.conf generated by the Fedora installer is::