[Buildroot] [PATCH 1/1] boot/uboot: introduce BR2_TARGET_UBOOT_NEEDS_XXD

[Yann E. MORIN <yann.morin.1998@free.fr>]

Titouan, All,

On 2021-01-24 10:43 +0100, Titouan Christophe spake thusly:
> When compiling uboot with a default environment built from a
> text file [1], the build pipeline uses the xxd command [2].
> 
> xxd is distributed with vim [3], which might no be installed
> on the host, so we provide this "uboot needs xxd" option to
> install host-vim for such a case.

This really is a big hammer.

On a lot of systems, vim is readily installed, and thus xxd will also
be installed. And on some systems, xxd is not provided by vim but by a
dedicated package (aptly named xxd on Ubuntu for example)

Also, it is very common for uboot configurations to indeed embed a
default environment script.

Bulding host-vim (and its depedency, host-ncurses) takes roughly 1 min
here, so it is not totally transparent...

Could we use a trick like we have for, say, tar, and only resort to
building our hown host-vim if xxd is missing?

Regards,
Yann E. MORIN.

> [1] https://gitlab.denx.de/u-boot/u-boot/-/blob/v2021.01/env/Kconfig#L612-628
> [2] https://gitlab.denx.de/u-boot/u-boot/-/blob/v2021.01/Makefile#L1887-1893
> [3] https://github.com/vim/vim/tree/v8.2.0000/src/xxd
> 
> Signed-off-by: Titouan Christophe <titouanchristophe@gmail.com>
> ---
>  boot/uboot/Config.in | 8 ++++++++
>  boot/uboot/uboot.mk  | 4 ++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/boot/uboot/Config.in b/boot/uboot/Config.in
> index d43c85cce7..5b91d23a81 100644
> --- a/boot/uboot/Config.in
> +++ b/boot/uboot/Config.in
> @@ -239,6 +239,14 @@ config BR2_TARGET_UBOOT_NEEDS_OPENSBI
>  	  and that the OpenSBI variable pointing to OpenSBI binary,
>  	  is passed during the Buildroot build.
>  
> +config BR2_TARGET_UBOOT_NEEDS_XXD
> +	bool "U-Boot needs xxd"
> +	help
> +	  Select this option if your U-Boot board configuration
> +	  requires xxd to be available on the host. This is typically
> +	  the case when the board configuration has USE_DEFAULT_ENV_FILE
> +	  enabled.
> +
>  menu "U-Boot binary format"
>  
>  config BR2_TARGET_UBOOT_FORMAT_AIS
> diff --git a/boot/uboot/uboot.mk b/boot/uboot/uboot.mk
> index 2478a2a1e9..3afed94dbe 100644
> --- a/boot/uboot/uboot.mk
> +++ b/boot/uboot/uboot.mk
> @@ -198,6 +198,10 @@ ifeq ($(BR2_TARGET_UBOOT_NEEDS_LZOP),y)
>  UBOOT_DEPENDENCIES += host-lzop
>  endif
>  
> +ifeq ($(BR2_TARGET_UBOOT_NEEDS_XXD),y)
> +UBOOT_DEPENDENCIES += host-vim
> +endif
> +
>  # prior to u-boot 2013.10 the license info was in COPYING. Copy it so
>  # legal-info finds it
>  define UBOOT_COPY_OLD_LICENSE_FILE
> -- 
> 2.25.3
> 
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