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authorThomas Chou <thomas@wytron.com.tw>2015-10-16 08:44:51 +0800
committerSimon Glass <sjg@chromium.org>2015-10-23 09:42:28 -0600
commit545dfd101400637219b7024ce0fc02728663380e (patch)
tree60e9b0327470b041080355a8345c6a62aead7891 /doc
parent2419cd16a1357a6d0f394b4631ea07b4f9e85ac7 (diff)
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env: export fdt_blob to the environment variable
Export fdt_blob to the environment variable. So that we may use it to boot Linux. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc')
-rw-r--r--doc/README.fdt-control5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/README.fdt-control b/doc/README.fdt-control
index e6d5ed0..29fd56a 100644
--- a/doc/README.fdt-control
+++ b/doc/README.fdt-control
@@ -156,7 +156,10 @@ address of the fdt binary blob, and will override either of the options.
Be aware that this environment variable is checked prior to relocation,
when only the compiled-in environment is available. Therefore it is not
possible to define this variable in the saved SPI/NAND flash
-environment, for example (it will be ignored).
+environment, for example (it will be ignored). After relocation, this
+variable will be set to the address of the newly relocated fdt blob.
+It is read-only and cannot be changed. It can optionally be used to
+control the boot process of Linux with bootm/bootz commands.
To use this, put something like this in your board header file: