[U-Boot] mlo and u-boot

[Lukasz Majewski]

On Wed, 22 Feb 2017 23:53:32 +0530
Ryan <ryanphilips19 at googlemail.com> wrote:

> Hello,
> 
> I am using AM43XX based board. The bootloader is divided into spl
> u-boot (MLO) and u-boot.bin
> 
> I wanted to check what variables are shared between them. How does MLO
> a seperate binary
> share the boot mode and mmcdev to u-boot so that it can use the
> appropriate mmcdev to find the
> kernel.

In u-boot, there is the concept of "environment variables", which are
stored in a separate non-persistent memory (like eMMC, NAND,) or file
system.

For example BBB uses eMMC to store envs.

It is possible to read envs in MLO and u-boot.

> 
> thanks,
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Best regards,

Lukasz Majewski

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