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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/driver-model | |
| parent | 6998974926df9b41b299cd9f1aaff37649ca9971 (diff) | |
| download | u-boot-54e1223aa4ca5d65fe3c6497e92bee4453aeddac.zip u-boot-54e1223aa4ca5d65fe3c6497e92bee4453aeddac.tar.gz u-boot-54e1223aa4ca5d65fe3c6497e92bee4453aeddac.tar.bz2 | |
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/driver-model')
| -rw-r--r-- | doc/driver-model/README.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/driver-model/README.txt b/doc/driver-model/README.txt index 07b120d..532a771 100644 --- a/doc/driver-model/README.txt +++ b/doc/driver-model/README.txt @@ -849,6 +849,10 @@ in the device tree node. For U-Boot proper you can use 'u-boot,dm-pre-proper' which means that it will be processed (and a driver bound) in U-Boot proper prior to relocation, but will not be available in SPL or TPL. +To reduce the size of SPL and TPL, only the nodes with pre-relocation properties +('u-boot,dm-pre-reloc', 'u-boot,dm-spl' or 'u-boot,dm-tpl') are keept in their +device trees (see README.SPL for details); the remaining nodes are always bound. + Then post relocation we throw that away and re-init driver model again. For drivers which require some sort of continuity between pre- and post-relocation devices, we can provide access to the pre-relocation |