diff options
| author | Eric Schikschneit <[email protected]> | 2025-06-03 12:06:24 -0500 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2025-06-19 19:00:09 -0600 |
| commit | 5ba5cbf5a29d54763f30b6685e6c06ffd51d29eb (patch) | |
| tree | f24f27348d09c788043072fe0535e0be808e6634 /doc | |
| parent | 0c6c8065a27804705c324f06998fea219e62f028 (diff) | |
dtc: Add Kconfig option to pad device tree blob
This will allow arch(s) that use device tree blobs to pad the end of the
device tree so they can be modified by board files at run time. This will
help prevent errors such as FDT_ERR_NOSPACE from occurring.
Signed-off-by: Eric Schikschneit <[email protected]>
[trini: Change default order so that X86 && EFI_APP works correctly]
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/board/broadcom/bcm7xxx.rst | 6 | ||||
| -rw-r--r-- | doc/develop/makefiles.rst | 5 |
2 files changed, 6 insertions, 5 deletions
diff --git a/doc/board/broadcom/bcm7xxx.rst b/doc/board/broadcom/bcm7xxx.rst index f1994d9f975..f559d5c290a 100644 --- a/doc/board/broadcom/bcm7xxx.rst +++ b/doc/board/broadcom/bcm7xxx.rst @@ -149,10 +149,8 @@ and with a generic ARMv7 root file system. * to the Linux source tree as a .dts file. * * To support modifications to the device tree - * in-place in U-Boot, add to Linux's - * arch/arm/boot/dts/Makefile: - * - * DTC_FLAGS ?= -p 4096 + * in-place in U-Boot, set the config variable + * CONFIG_SYS_DTC_PAD_BYTES as needed. * * This will leave some padding in the DTB and * thus reserve room for node additions. diff --git a/doc/develop/makefiles.rst b/doc/develop/makefiles.rst index 37a7deaca92..593556f4dd5 100644 --- a/doc/develop/makefiles.rst +++ b/doc/develop/makefiles.rst @@ -1430,10 +1430,13 @@ When kbuild executes, the following steps are followed (roughly): A central rule exists to create `$(obj)/%.dtb` from `$(src)/%.dts`; architecture Makefiles do no need to explicitly write out that rule. + The device tree can now be padded by the specified number of bytes + by setting CONFIG_SYS_DTC_PAD_BYTES instead of explicitly setting + DTC_FLAGS with the -p option. + Example:: targets += $(dtb-y) - DTC_FLAGS ?= -p 1024 7.9 Preprocessing linker scripts -------------------------------- |