[PATCH master v2 0/7] firmware: optionally turn missing firmware errors into warnings

[Sascha Hauer]

On Tue, Jun 27, 2023 at 07:52:32AM +0200, Ahmad Fatoum wrote:
> v1 -> v2:
>    - mark firmware used for PBL as pbl-only (fixes unintended build
>      error)
>    - fix escape of newline character in firmware/Makefile
>    - fix build failing even with CONFIG_MISSING_FIRMWARE_ERROR unset

Applied, thanks

Sascha

> 
> Many of the ARMv8 defconfigs can require firmware external to barebox
> for proper operation: TF-A as BL31, DDR PHY firmware, SDRAM setup
> or OP-TEE. This led to defconfigs that fail to build by default
> unless the user installs the firmware files into the firmware directory.
> 
> While this worked for the SoC-specific defconfigs, it's really annoying
> for the multi_v8_defconfig:
> 
>   - The user will need to install firmware even for unrelated
>     platforms
> 
>   - Some platforms like e.g. qemu-virt64, which need no firmware to
>     be compiled into barebox, can't be built just by using the
>     defconfig
> 
> For v2023.06.0, this was resolved by disabling boards that lack firmware
> through hiding their Kconfig symbol. This has a few shortcomings:
> 
>   - Firmware is looked up relative to source tree and can't take
>     CONFIG_EXTRA_FIRMWARE_DIR into account that early
> 
>   - Firmware needs to exist at configure stage, which breaks
>     build system recipes that install firmware after configure
>     stage
> 
>   - menuconfig e.g. in Yocto's cml1.bbclass doesn't take make options
>     into account that are otherwise used for olddefconfig and build
> 
> This series resolves the underlying issue differently: We record
> whether firmware is missing and just continue the build till the end
> at which time the build would succeed (with warnings) if new option
> CONFIG_MISSING_FIRMWARE_ERROR was unset.
> 
> In any case, barebox images which contain firmware in their PBL
> that's not available will be marked specially to reduce the risk
> of accidentally putting them to use:
> 
>   * They're truncated to zero size
> 
>   * The final "images built:" section marks them as having firmware
>     missing, e.g.  ** firmware missing for barebox-rk3568-bpi-r2pro.img**
> 
>   * They are omitted from the listing in the barebox-flash-images file
> 
>   * Each barebox-broken.img is accompanied with a
>     barebox-broken.img.missing-firmware containing a newline delimited
>     list of missing firmware images
> 
> 
> Ahmad Fatoum (7):
>   firmware: reference pointer alignment defined in
>     <asm-generic/pointer.h>
>   firmware: mark firmware used in PBL as pbl-only
>   firmware: turn missing firmware into linker error
>   firmware: optionally turn missing firmware errors into warnings
>   ARM64: Rockchip: gracefully handle missing firmware
>   ARM64: unset CONFIG_MISSING_FIRMWARE_ERROR for Rockchip/i.MX
>   firmware: don't hardcode firmware paths in srctree for existence check
> 
>  arch/arm/configs/imx_v8_defconfig      |  1 +
>  arch/arm/configs/multi_v8_defconfig    |  1 +
>  arch/arm/configs/rockchip_v8_defconfig |  1 +
>  arch/arm/mach-imx/Kconfig              | 49 -------------------
>  arch/arm/mach-rockchip/Kconfig         |  6 ---
>  firmware/Kconfig                       | 49 +++++--------------
>  firmware/Makefile                      | 47 +++++++++++-------
>  images/Makefile                        | 23 ++++++---
>  images/Makefile.rockchip               | 68 +++++++++-----------------
>  scripts/Makefile.lib                   |  3 ++
>  10 files changed, 88 insertions(+), 160 deletions(-)
> 
> -- 
> 2.39.2
> 
> 
> 

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