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| author | Patrick Delaunay <patrick.delaunay@st.com> | 2019-05-21 19:19:13 +0200 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2019-07-10 16:52:58 -0600 |
| commit | 54e1223aa4ca5d65fe3c6497e92bee4453aeddac (patch) | |
| tree | 86f78ab283c217cb445ef92ebb9d51569e22b5bf /doc/README.SPL | |
| parent | 6998974926df9b41b299cd9f1aaff37649ca9971 (diff) | |
dm: doc: add documentation for pre-reloc properties in SPL and TPL
Add documentation for the pre-reloc property in SPL and TPL device-tree:
- u-boot,dm-pre-proper
- u-boot,dm-pre-reloc
- u-boot,dm-spl
- u-boot,dm-tpl
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc/README.SPL')
| -rw-r--r-- | doc/README.SPL | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/doc/README.SPL b/doc/README.SPL index 7a30fefa96..6eed83f8c5 100644 --- a/doc/README.SPL +++ b/doc/README.SPL @@ -66,6 +66,22 @@ CONFIG_SPL_SPI_LOAD (drivers/mtd/spi/spi_spl_load.o) CONFIG_SPL_RAM_DEVICE (common/spl/spl.c) CONFIG_SPL_WATCHDOG_SUPPORT (drivers/watchdog/libwatchdog.o) +Device tree +----------- +The U-Boot device tree is filtered by the fdtgrep tools during the build +process to generate a much smaller device tree used in SPL (spl/u-boot-spl.dtb) +with: +- the mandatory nodes (/alias, /chosen, /config) +- the nodes with one pre-relocation property: + 'u-boot,dm-pre-reloc' or 'u-boot,dm-spl' + +ftgrep is also used to remove: +- the properties defined in CONFIG_OF_SPL_REMOVE_PROPS +- all the pre-relocation properties + ('u-boot,dm-pre-reloc', 'u-boot,dm-spl' and 'u-boot,dm-tpl') + +All the nodes remaining in the SPL devicetree are bound +(see driver-model/README.txt). Debugging --------- |