[U-Boot] Random number generator - why I need it

[U-Boot] Random number generator - why I need it

[Stanislav Vlasic]

Hi,

I'm using customized U-Boot 2011.03 (for Amlogic platform).

What I need is solution for getting random number (on first boot) which
will be written to ubootenv. Let's say I have 100 strings stored in string
array of board file.

On first boot I have to pick one random string from list and write it to
ubootenv (range 0..99). Writing to ubootenv is not problem, problem is
randomization. My current tries ended up in getting same number each time
(2 different algorithms). Does anyone have solution for this?

Keep in mind that my PCB does not have RTC battery and does not store time,
so on each power on clock is back to default (1970).

Thanx and best regards,
Stanislav Vlasic

[U-Boot] Random number generator - why I need it

[Jeroen Hofstee]

Hello Stanislav,

On 18-07-14 16:41, Stanislav Vlasic wrote:
> What I need is solution for getting random number (on first boot) which
> will be written to ubootenv.

mm, you forgot to describe why.. and what you mean with random.

Anyway, can't the host programming the device not provide
a pseudo random number. It likely has far better provision for
that...

Regards,
Jeroen