linux-kernel - Re: [PATCH mips-next 0/2] mips: boot: add support for self-extracting FIT images (vmlinuz.itb)

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Date:   Wed, 04 Nov 2020 13:39:50 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Alexander Lobakin <alobakin@...me>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Paul Burton <paulburton@...nel.org>,
        Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH mips-next 0/2] mips: boot: add support for self-extracting FIT images (vmlinuz.itb)

From: Paul Cercueil <paul@...pouillou.net>
Date: Wed, 04 Nov 2020 11:26:09 +0000

> Hi Alexander,

Hi Paul!

> Le dim. 1 nov. 2020 � 15:11, Alexander Lobakin <alobakin@...me> a
> écrit :
>> Commit c3e2ee657418 ("MIPS: generic: Add support for zboot") added
>> support for self-extracting images to Generic MIPS. However, the
>> intended way to boot Generic MIPS kernels is using FIT Images and
>> UHI boot protocol, but currently there's no way to make
>> self-extracting
>> FIT Image (only legacy uzImages).
>>
>> This set consists of two parts:
>> 1) various cleanups in arch/mips/boot/compressed/Makefile as a
>>    prerequisite;
>> 2) a new target named "vmlinuz.itb" for composing self-extracting
>>    FIT Images, which allows to have the advantages of both UHI and
>>    vmlinuz.
>>
>> The second part involves some scenarios duplication, but I think it
>> can be a subject for another series (for constifying and unifying
>> FIT Images rules across the architectures).
>>
>> Alexander Lobakin (2):
>>   mips: boot: clean up self-extracting targets scenarios
>>   mips: boot: add support for self-extracting FIT images (vmlinuz.itb)
>
> It doesn't break anything on my end, so:
>
> Acked-by: Paul Cercueil <paul@...pouillou.net>
>
> for the series.

Thanks!

> Why vmlinuz.itb and not vmlinuz.fit or vmlinuz.uhi? Is the .itb suffix
> already a thing?

As far as I know -- yes, ITB stands for Image Tree Blob (reference
to Device Tree Blob) and it's a standartized extension for FIT Images
(you can see that all variants for MIPS have ".itb" at the bottom of
arch/mips/boot/Makefile).

> Cheers,
> -Paul

Al

>>  arch/mips/Makefile                 |  3 +-
>>  arch/mips/boot/.gitignore          |  1 +
>>  arch/mips/boot/compressed/Makefile | 96
>> +++++++++++++++++++++++++-----
>>  3 files changed, 85 insertions(+), 15 deletions(-)
>>
>> --
>> 2.29.2