complete List of possible environment keys?

Hello,
i understand that most Key=Value pairs in the environment are either
u-boot commands, that are passed directly to uboot, or
script commands, that populate env variables, run other commands etc.

I found a list of uboot commands here, and an explanation on u-boot here. This got me deep into understanding the boot process.

But there are also other things like

• the LED section:
  led_error=orange
  led_exit=green off
  led_init=green blinking
• the preboot_nc=... line
• the ncip env variable
• the device=0:1 line

AKAIK none of these things are referenced in any other scripts, nor are they understood by u-boot itself.
Which part of the system understands these commands?
Like in case of "preboot_nc", it cannot be the linux kernel, since then the name wouldnt make sense...
Are there more commands?
Is there an (possibly complete) list of all keys , their values and meanings?
where can i dig for those myself?



Edited 5 time(s). Last edit at 09/23/2017 02:08PM by shivahoj.

shivahoj,

There are 2 types of envs: u-boot predefined envs, and user-defined.

> led_error=orange
> led_exit=green off
> led_init=green blinking
> [*]the preboot_nc=... line
> [*]the ncip env variable
> [*]the device=0:1 line

The above are user-defined envs. Jeff, davygravy, and I contributed in creating these u-boot envs in the past.

U-boot predefined envs are things such as: ethaddr, serverip, preboot,.... And you can redefine them to make it work the way you would want to.

You've already found the U-Boot website where we can find the u-boot predefined envs.

Quote

I found a list of uboot commands here, and an explanation on u-boot here. This got me deep into understanding the boot process.

Note: it is usually a bit out-of-date.

-bodhi
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