[coreboot] Rebuilding coreboot image generation

Patrick Georgi pgeorgi at google.com
Sat Nov 21 01:18:51 CET 2015

So you think we're better off with one place to store the partition
layout, a separate one to store what files belong where, and yet
another one for the properties of those files, each with their own
syntax and tooling?

2015-11-21 1:08 GMT+01:00 Julius Werner <jwerner at chromium.org>:
>> Let's extend your example so it becomes somewhat comparable to my proposal:
>> [...]
>> And that for every mainboard, and not transferable to other flash
>> layout schemes.
>> I don't think this is looking better (or even just as good) as my
>> proposal, simple because of maintenance reasons.
> Sorry, I'm not quite sure how to read that... did you literally mean
> that the cbfstool commands (or something equivalent) would be *in* the
> .fmd file? That is certainly not what I meant.
> Instead, I was suggesting to use well-known CBFS "categories" and have
> another part of the system (e.g. the Makefiles) map files to those.
> For example when something (a mainboard, an SoC, etc.) declares a
> file, it would declare that this file belongs to the "pre-boot-split
> CBFS" category or the "post-boot-split CBFS" category (or for all I
> care you could also bind them directly to romstage/ramstage/etc. which
> is I think closer to what you were proposing). Then the part deciding
> the boot scheme ("vboot" and "traditional coreboot" for now) would
> know that all "pre-boot-split" files would belong into the well-known
> CBFS FMAP sections "FALLBACK" and "NORMAL" for traditional coreboot,
> whereas "post-boot-split" would only go into "NORMAL" (and the vboot
> version would instead know how to bind those categories to its
> RO/RW_A/RW_B sections). The .fmd file should *only* define the layout,
> and all the individual platform pieces that need to add files should
> *only* declare something abstract about in which context those files
> are used. Then something else (which is deciding the general boot
> method) should define how to bind those two together.

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