Merge pull request #4839

d71f89e2 device/trezor: device/trezor: correct device initialization, status check (Dusan Klinec)
65b9bca7 device/trezor: python2 compatibility - bundle dependencies (Dusan Klinec)
9cf636af device/trezor: ask for KI sync on first refresh (Dusan Klinec)
d21dad70 device: enable to use multiple independent device wallets (Dusan Klinec)
318cc784 device/trezor: passphrase entry on host (Dusan Klinec)

1 files changed, 18 insertions, 4 deletions

diff --git a/src/device_trezor/trezor/tools/README.md b/src/device_trezor/trezor/tools/README.md
index b176017ac..0802e734a 100644
--- a/src/device_trezor/trezor/tools/README.md
+++ b/src/device_trezor/trezor/tools/README.md
@@ -10,14 +10,28 @@ Install `protoc` for your distribution. Requirements:
 
 
 Soft requirement: Python 3, can be easily installed with [pyenv].
+If Python 3 is used there are no additional python dependencies.
 
-### Python 2
+Since Cmake 3.12 the `FindPython` module is used to locate the Python 
+interpreter in your system. It preferably searches for Python 3, if none
+is found, it searches for Python 2. 
 
-Workaround if there is no Python3 available:
+Lower version of the cmake uses another module which does not guarantee 
+ordering. If you want to override the selected python you can do it in 
+the following way:
 
 ```bash
-pip install backports.tempfile
-```
+export TREZOR_PYTHON=`which python3`
+``` 
+ 
+
+### Python 2.7+
+
+Python 3 has `tempfile.TemporaryDirectory` available but Python 2 lacks
+this class so the message generation code uses `backports.tempfile` package
+bundled in the repository.
+
+The minimal Python versions are 2.7 and 3.4
 
 ### Regenerate messages