Clarification on Bloblist Initialization Settings

[Simon Glass]

Hi Harrison,

On Thu, 14 Nov 2024 at 13:41, Harrison Mutai <Harrison.Mutai at arm.com> wrote:
>
> Hi all,
> I wanted to clarify some details about the settings for initializing a Bloblist (i.e., CONFIG_BLOBLIST_ALLOC, CONFIG_BLOBLIST_FIXED, CONFIG_BLOBLIST_PASSAGE). The documentation states that if CONFIG_BLOBLIST_PASSAGE is selected, it uses the bloblist in the incoming standard passage.
> Does this mean that the bloblist is used in-place wherever the previous stage places it? For example, if TF-A passes a bloblist at an address specified in the platform's boot parameters, would this mode use the bloblist in that location?

Yes that's right, but if BLOBLIST_SIZE_RELOC is used, U-Boot may relocate it.

> The reason I ask is that I'm preparing some patches to add bloblist support to vexpress64, and I'm looking to configure this platform without specifying BLOBLIST_ADDR or BLOBLIST_SIZE (i.e., automatically detect these).

Yes, that is a better way to do it, now that we have the ability to
pass a bloblist between phases.


> Thanks for your help!
> Best regards,
> Harrison
>
> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

I hope not!

Regards,
Simon