[Buildroot] [RFC/next v2 1/2] package/rpi-firmware: rework boot/config file handling

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

Peter, All,

Second part of the review... ;-)

On 2021-02-16 21:11 +0100, Peter Seiderer spake thusly:
> Try to be less smart (focused on the one target/one use-case),
> instead reduce the rpi-firmware package to a selectable list
> of (verbatim) installed firmware files.
> 
> - change rpi-firmware config handling from rpi-variant/rpi-flavour
>   choices to bootcode.bin, pi-default/-extended/-cut-down and
>   pi4-/default/-extended/-cut-down selection
> 
> - add BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE option to select installable
>   config.txt file
> 
> - remove config.txt modify code/handling from raspberry post-image.sh
>   script
> 
> - add different customized config.txt files to the raspberry board
>   section
> 
> - change raspberry defconfigs to select appropiate rpi-firmware
>   and config.txt files
> 
> - change genimage-raspberrypi4.cfg/genimage-raspberrypi4-64.cfg to
>   use start4.elf and fixup4.dat
> 
> With this changes a better support for custom use-cases should
> be possible, specially multi-target SD cards as suggested by
> Stefan Agner ([1]).
> 
> [1] http://lists.busybox.net/pipermail/buildroot/2021-February/303318.html
> 
> Signed-off-by: Peter Seiderer <ps.report@gmx.net>
[--SNIP--]
> diff --git a/package/rpi-firmware/rpi-firmware.mk b/package/rpi-firmware/rpi-firmware.mk
> index f3d28ef825..a7ab8f0f14 100644
> --- a/package/rpi-firmware/rpi-firmware.mk
> +++ b/package/rpi-firmware/rpi-firmware.mk
> @@ -10,6 +10,46 @@ RPI_FIRMWARE_LICENSE = BSD-3-Clause
>  RPI_FIRMWARE_LICENSE_FILES = boot/LICENCE.broadcom
>  RPI_FIRMWARE_INSTALL_IMAGES = YES
>  
> +ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_BOOTCODE_BIN),y)
> +RPI_FIRMWARE_FILES += bootcode.bin
> +endif
> +
> +ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI),y)
> +RPI_FIRMWARE_FILES += start.elf fixup.dat
> +endif
> +
> +ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI_X),y)
> +RPI_FIRMWARE_FILES += startx.elf fixupx.dat
> +endif
> +
> +ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI_CD),y)
> +RPI_FIRMWARE_FILES += start_cd.elf fixup_cd.dat
> +endif
> +
> +ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4),y)
> +RPI_FIRMWARE_FILES += start4.elf fixup4.dat
> +endif
> +
> +ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4_X),y)
> +RPI_FIRMWARE_FILES += start4x.elf fixup4x.dat
> +endif
> +
> +ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4_CD),y)
> +RPI_FIRMWARE_FILES += start4cd.elf fixup4cd.dat
> +endif

What about:

    RPI_FIRMWARE_FILES = \
        $(if $(BR2_PACKAGE_RPI_FIRMWARE_BOOTCODE_BIN),bootcode.bin) \
        $(if $(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI),start.elf fixup.dat) \
        $(if $(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI_X),startx.elf fixupx.dat) \
        $(if $(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI_CD),start_cd.elf fixup_cd.dat) \
        $(if $(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4),start4.elf fixup4.dat) \
        $(if $(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4_X),start4x.elf fixup4x.dat) \
        $(if $(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4_CD),start4cd.elf fixup4cd.dat)

Or alternatively:

    RPI_FIRMWARE_FILES_$(BR2_PACKAGE_RPI_FIRMWARE_BOOTCODE_BIN) += bootcode.bin
    RPI_FIRMWARE_FILES_$(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI) += start.elf fixup.dat
    RPI_FIRMWARE_FILES_$(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI_X) += startx.elf fixupx.dat
    RPI_FIRMWARE_FILES_$(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI_CD) += start_cd.elf fixup_cd.dat
    RPI_FIRMWARE_FILES_$(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4) += start4.elf fixup4.dat
    RPI_FIRMWARE_FILES_$(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4_X) += start4x.elf fixup4x.dat
    RPI_FIRMWARE_FILES_$(BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4_CD) += start4cd.elf fixup4cd.dat

    define RPI_FIRMWARE_INSTALL_BIN
        $(foreach f,$(RPI_FIRMWARE_FILES_y),
            $(INSTALL) -D -m 0644 $(@D)/$(f) $(BINARIES_DIR)/rpi-firmware/$(f)
        )
    endef

> +define RPI_FIRMWARE_INSTALL_BIN
> +	for firmwbin in  $(RPI_FIRMWARE_FILES); do \
> +		$(INSTALL) -D -m 0644 $(@D)/boot/$${firmwbin} $(BINARIES_DIR)/rpi-firmware/$${firmwbin} || exit 1; \
> +	done

Use a make-level $(foreach) loop rather than a shell loop (see example
above).

Regards,
Yann E. MORIN.

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