diff options
Diffstat (limited to 'doc/build')
| -rw-r--r-- | doc/build/index.rst | 1 | ||||
| -rw-r--r-- | doc/build/reproducible.rst | 25 |
2 files changed, 26 insertions, 0 deletions
diff --git a/doc/build/index.rst b/doc/build/index.rst index dc9cde4001..64e66491bd 100644 --- a/doc/build/index.rst +++ b/doc/build/index.rst @@ -9,6 +9,7 @@ Build U-Boot source gcc clang + reproducible docker tools buildman diff --git a/doc/build/reproducible.rst b/doc/build/reproducible.rst new file mode 100644 index 0000000000..5423080633 --- /dev/null +++ b/doc/build/reproducible.rst @@ -0,0 +1,25 @@ +Reproducible builds +=================== + +In order to achieve reproducible builds, timestamps used in the U-Boot build +process have to be set to a fixed value. + +This is done using the SOURCE_DATE_EPOCH environment variable which specifies +the number of seconds since 1970-01-01T00:00:00Z. + +Example +------- + +To build the sandbox with 2023-01-01T00:00:00Z as timestamp we can use: + +.. code-block:: bash + + make sandbox_defconfig + SOURCE_DATE_EPOCH=1672531200 make + +This date is shown when we launch U-Boot: + +.. code-block:: console + + ./u-boot -T + U-Boot 2023.01 (Jan 01 2023 - 00:00:00 +0000) |