[TF-A] Proposal: TF-A to adopt hand-off blocks (HOBs) for information passing between boot stages

[Mark Kettenis]

> From: Simon Glass <sjg at chromium.org>
> Date: Fri, 9 Apr 2021 06:19:08 +1200
> 
> Here are a few thoughts on UUIDs.
> Why a UUID/GUID is probably not the answer
> 
> sjg, 30-Mar-21
> Code is for humans
> 
> Code should be readable, so far as possible.
> 
> This is not readable:
> 
> #define FSP_HOB_RESOURCE_OWNER_SMM_PEI_SMRAM_GUID \
> 
> EFI_GUID(0x6dadf1d1, 0xd4cc, 0x4910, \
> 
> 0xbb, 0x6e, 0x82, 0xb1, 0xfd, 0x80, 0xff, 0x3d)
> 
> This is readable:
> 
> enum {
> 
> BLOBLISTT_SPL_HANDOFF = 123,
> 
> };
> UUID is more like a hash than a sequence number

No kidding.  Try figuring out what an ACPI ASL methods like _DSM and
_OSC are supposed to do when trying to figure out what the code is
supposed to do.

They're terrible to grep for in source code since there is no uniform
way to format them in the code.

And then there is the issue of byte order of course.