linux-kernel - Re: [PATCH 2/2] firmware_loader: Enable compressed files in EXTRA

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Date: Wed, 3 Jan 2024 21:22:23 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Kevin Martin <kevinmbecause@...il.com>
Cc: Luis Chamberlain <mcgrof@...nel.org>, Russ Weight <russ.weight@...ux.dev>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] firmware_loader: Enable compressed files in EXTRA_FIRMWARE

On Wed, Dec 20, 2023 at 7:33 PM Kevin Martin <kevinmbecause@...il.com> wrote:
>
> The linux-firmware packages on Gentoo, Fedora, Arch, and others compress
> the firmware files. This works well with CONFIG_FW_LOADER_COMPRESS, but
> does not work with CONFIG_EXTRA_FIRMWARE. This patch allows the build
> system to decompress firmware files specified by CONFIG_EXTRA_FIRMWARE.
> Uncompressed files are used first, then the compressed files are used.







>
> Signed-off-by: Kevin Martin <kevinmbecause@...il.com>
> ---
>  drivers/base/firmware_loader/Kconfig          |  5 ++++-
>  drivers/base/firmware_loader/builtin/Makefile | 16 ++++++++++++----
>  2 files changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig
> index 5ca00e02f..b7a908bff 100644
> --- a/drivers/base/firmware_loader/Kconfig
> +++ b/drivers/base/firmware_loader/Kconfig
> @@ -76,7 +76,10 @@ config EXTRA_FIRMWARE
>           image since it combines both GPL and non-GPL work. You should
>           consult a lawyer of your own before distributing such an image.
>
> -         NOTE: Compressed files are not supported in EXTRA_FIRMWARE.
> +         NOTE: Compressed files are supported by EXTRA_FIRMWARE. The build
> +         system will look for uncompressed files first then fall back to
> +         searching for compressed files in a similar way to
> +         CONFIG_FW_LOADER_COMPRESS.
>
>  config EXTRA_FIRMWARE_DIR
>         string "Firmware blobs root directory"
> diff --git a/drivers/base/firmware_loader/builtin/Makefile b/drivers/base/firmware_loader/builtin/Makefile
> index 6c067dedc..cc60eb441 100644
> --- a/drivers/base/firmware_loader/builtin/Makefile
> +++ b/drivers/base/firmware_loader/builtin/Makefile
> @@ -20,7 +20,7 @@ filechk_fwbin = \
>         echo "    .section .rodata"                             ;\
>         echo "    .p2align 4"                                   ;\
>         echo "_fw_$(FWSTR)_bin:"                                ;\
> -       echo "    .incbin \"$(fwdir)/$(FWNAME)\""               ;\
> +       echo "    .incbin \"$(obj)/$(FWNAME)\""         ;\




Insert a tab to keep the alignment of ";\"




Also, please update the .gitignore because
any arbitrary firmware file might be copied to
this directory.
All files except the 3 check-in files must be
ignored.



@@ -1,2 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-*.gen.S
+*
+!.gitignore
+!Makefile
+!main.c









--
Best Regards
Masahiro Yamada