On Tue, 21 May 2019 11:13:52 +0200 Eugeniu Rosca erosca@de.adit-jv.com wrote:
Hi Lukasz,
On Tue, May 21, 2019 at 10:02:34AM +0100, Alex Kiernan wrote:
On Tue, May 21, 2019 at 9:37 AM Lukasz Majewski lukma@denx.de wrote:
Hi Alex,
On Mon, May 20, 2019 at 8:23 AM Eugeniu Rosca erosca@de.adit-jv.com wrote:
Should it default to enabled if avb is used?
I think at this specific moment in time, 'bcb' is orthogonal (meaning it is neither a direct, nor a reverse dependency) to any other Android feature in U-Boot. This could be re-assessed, if platform maintainers start to rely on 'bcb' in their U-Boot environments on regular basis.
'bcb' looks like something I'd be interested in, not running Android at all... currently I (ab)use the bootcounter to communicate between the kernel and U-Boot when I want to force a board through recovery,
I don't know your exact use case, but wouldn't it be better to use envs (with redundancy) and fw_setenv / fw_printenv from Linux user space?
Now those envs even support setting default values for u-boot (as there is now separate library used for it). Moreover there is OE/Yocto's recipe 'u-boot-fw-utils' which can be easily used and installed.
That's a truly constructive suggestion. Nevertheless, I believe this would not work in case of CONFIG_ENV_IS_NOWHERE=y, which is how U-Boot is built and used by the developers in our organization.
I don't mind to see Android's "bcd" supported in U-Boot (I'm even happy for it).
And yes - the CONFIG_ENV_IS_NOWHERE means that one loads the default envs (created at build time) to RAM for booting.
Just one note (maybe you will find it useful) - it is possible to specify the default envs from external file: https://lists.denx.de/pipermail/u-boot/2018-March/323347.html
As we don't have memory to store envs we cannot adjust or pass data via it.
It's a long story... I'm constrained by historic choices, which makes using the environment problematic. But you're right.
-- Alex Kiernan
Best regards,
Lukasz Majewski
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DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de