warning: TEST_RANDOM_GENERATOR
Andrei Gansari
Hello everyone,
I have a question regarding TEST_RANDOM_GENERATOR. When building networking samples for boards with entropy devices is get the warning: warning: TEST_RANDOM_GENERATOR (defined at subsys/random/Kconfig:8) was assigned the value 'y' but got the value 'n'.
We find in subsys/random/Kconfig TEST_RANDOM_GENERATOR depends on !ENTROPY_HAS_DRIVER ENTROPY_DEVICE_RANDOM_GENERATOR depends on ENTROPY_HAS_DRIVER
Most networking samples have set TEST_RANDOM_GENERATOR=y and as I understand it's for pseudo-random number generation. Boards that have entropy devices (ENTROPY_HAS_DRIVER) will disable TEST_RANDOM_GENERATOR.
When setting TEST_RANDOM_GENERATOR we just want a random generator or we want a predictable/intuitive random number generator? If we want both type of generators, then we could remove ENTROPY_HAS_DRIVER check on TEST_RANDOM_GENERATOR?
Is this an issue?
Andrei G.
|
|
Paul Sokolovsky
Hello Andrei,
On Tue, 29 Jan 2019 13:35:19 +0000 "Andrei Gansari" <andrei.gansari@...> wrote: Hello everyone,We want to have a "random generator" device be present in Zephyr setup, which various subsystems then can use (instead of failing). So, TEST_RANDOM_GENERATOR is a fallback choice which is always available. For example, it's available in qemu_* boards, which otherwise don't have a "real" randomgen. That's why you see TEST_RANDOM_GENERATOR in many networking samples - the only way to make networking samples accessing to *anyone* is to make sure they run with qemu networking. Regarding "predictable random number generator", that's interesting idea for some kinds of testing, but I'm personally not aware of us using such advanced and cunning test methods in Zephyr. If we want[] -- Best Regards, Paul Linaro.org | Open source software for ARM SoCs Follow Linaro: http://www.facebook.com/pages/Linaro http://twitter.com/#!/linaroorg - http://www.linaro.org/linaro-blog
|
|
Paul Sokolovsky
Hello Alberto,
On Wed, 30 Jan 2019 07:15:41 +0000 "Alberto Escolar Piedras (ALPI)" <ALPI@...> wrote: D'oh, I stand corrected. Now I remember it, Bluetooth simulationRegarding "predictable random number generator", that's interestingThat's the native posix one ;) support, right? [] -- Best Regards, Paul Linaro.org | Open source software for ARM SoCs Follow Linaro: http://www.facebook.com/pages/Linaro http://twitter.com/#!/linaroorg - http://www.linaro.org/linaro-blog
|
|
alpi@...
Hi,
toggle quoted messageShow quoted text
The native_posix board does not use the Bluetooth simulator. Its random generator is deterministic, but can be seeded ( --seed=<random_seed>) to enable reproducible tests(*1). The nrf52_bsim board (*2) does use the Bluetooth simulator (BabbleSim, a.k.a. bsim (*3)), and has another random generator (a model of the nRF5x RNG HW) which is also deterministic and can be seeded. What these 2 Zephyr targets have in common is that both are based on the POSIX architecture. So the result of building targeting these boards is actually a native executable for the host computer, which the developer can run and debug like a normal Linux program. Apart from this, the nrf52_bsim RADIO HW models, use the BabbleSim physical layer simulator to simulate the radio activity, and communicate with other simulated devices. 1 https://docs.zephyrproject.org/latest/boards/posix/native_posix/doc/board.html#peripherals 2 https://docs.zephyrproject.org/latest/boards/posix/nrf52_bsim/doc/board.html 3 https://babblesim.github.io BR Alberto
-----Original Message-----
From: Paul Sokolovsky [mailto:paul.sokolovsky@...] Sent: Wednesday 30 January 2019 08:22 To: Alberto Escolar Piedras (ALPI) <ALPI@...>; devel@... Subject: Re: [Zephyr-devel] warning: TEST_RANDOM_GENERATOR Hello Alberto, On Wed, 30 Jan 2019 07:15:41 +0000 "Alberto Escolar Piedras (ALPI)" <ALPI@...> wrote: D'oh, I stand corrected. Now I remember it, Bluetooth simulation support, right?Regarding "predictable random number generator", that's interestingThat's the native posix one ;) [] -- Best Regards, Paul Linaro.org | Open source software for ARM SoCs Follow Linaro: http://www.facebook.com/pages/Linaro http://twitter.com/#!/linaroorg - http://www.linaro.org/linaro-blog
|
|