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| author | Simon Glass <sjg@chromium.org> | 2019-07-20 20:51:17 -0600 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2019-08-02 11:19:14 -0400 |
| commit | 88fa4beb631c5329bf616554f7d2714ece7a5f0b (patch) | |
| tree | 845ded2b808a0c57184b45d83035487aa8dbc60c /doc/README.autoboot | |
| parent | e8c780560ad2a3104c0cbfbb61f0ac229881599d (diff) | |
| download | u-boot-88fa4beb631c5329bf616554f7d2714ece7a5f0b.tar.gz u-boot-88fa4beb631c5329bf616554f7d2714ece7a5f0b.tar.bz2 u-boot-88fa4beb631c5329bf616554f7d2714ece7a5f0b.zip | |
autoboot: Improve docs for CONFIG_AUTOBOOT_ENCRYPTION
This option is not documented properly at present. Fix it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc/README.autoboot')
| -rw-r--r-- | doc/README.autoboot | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/doc/README.autoboot b/doc/README.autoboot index eeb7e4c662..de35f3093d 100644 --- a/doc/README.autoboot +++ b/doc/README.autoboot @@ -132,6 +132,21 @@ What they do provides an escape sequence from the limited "password" strings. + CONFIG_AUTOBOOT_ENCRYPTION + + "bootstopkeysha256" environment variable + + - Hash value of the input which unlocks the device and + stops autoboot. + + This option allows a string to be entered into U-Boot to stop the + autoboot. The string itself is hashed and compared against the hash + in the environment variable 'bootstopkeysha256'. If it matches then + boot stops and a command-line prompt is presented. + + This provides a way to ship a secure production device which can also + be accessed at the U-Boot command line. + CONFIG_RESET_TO_RETRY (Only effective when CONFIG_BOOT_RETRY_TIME is also set) |