Re: [Buildroot] [PATCH v9 03/11] boot/uboot: add support for building the TI K3 DM into U-Boot

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

Andreas, All,

On 2023-06-22 11:02 -0500, Andreas Dannenberg via buildroot spake thusly:
> Certain TI K3 devices such as AM62x and AM62Ax require a Device Manager
> (DM) firmnware to be made available to the U-Boot build, which will get
> packaged into the "tispl.bin" image tree blob during A53 SPL build.
> Without that DM firmware U-Boot will not be functional. To support this,
> add a config option called BR2_TARGET_UBOOT_NEEDS_TI_K3_DM to enable
> this feature, and another option BR2_TARGET_UBOOT_TI_K3_DM_SOC to allow
> setting the name of the SOC which needs to match the corresponding
> folder name in the ti-linux-firmware Git repository.
> 
> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
> ---
>  boot/uboot/Config.in | 17 +++++++++++++++++
>  boot/uboot/uboot.mk  | 16 ++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/boot/uboot/Config.in b/boot/uboot/Config.in
> index 085397d03d..7e1dd44196 100644
> --- a/boot/uboot/Config.in
> +++ b/boot/uboot/Config.in
> @@ -240,6 +240,23 @@ config BR2_TARGET_UBOOT_NEEDS_OPTEE_TEE
>  	  U-Boot, and that the TEE variable pointing to OPTEE's
>  	  tee.elf, is passed during the Buildroot build.
>  
> +config BR2_TARGET_UBOOT_NEEDS_TI_K3_DM
> +	bool "U-Boot needs TI K3 Device Manager (DM)"
> +	help
> +	  Some TI K3 devices need the Device Manager (DM) firmware
> +	  to be available for the U-Boot build. Currently supports FW
> +	  from Git tag 08.06.00.006 by default.
> +
> +	  https://git.ti.com/cgit/processor-firmware/ti-linux-firmware/tree/ti-dm?h=ti-linux-firmware
> +
> +config BR2_TARGET_UBOOT_TI_K3_DM_SOC
> +	string "TI K3 Device Manager (DM) SOC Type"
> +	depends on BR2_TARGET_UBOOT_NEEDS_TI_K3_DM
> +	help
> +	  Name of the TI K3 Device Manager (DM) SOC. This needs to
> +	  match one of the SOC-specific folders in within the ti-dm
> +	  folder of the ti-linux-firmware Git repository.
> +
>  config BR2_TARGET_UBOOT_NEEDS_OPENSBI
>  	bool "U-Boot needs OpenSBI"
>  	depends on BR2_TARGET_OPENSBI
> diff --git a/boot/uboot/uboot.mk b/boot/uboot/uboot.mk
> index 4eae8e95c3..48af69bd26 100644
> --- a/boot/uboot/uboot.mk
> +++ b/boot/uboot/uboot.mk
> @@ -184,6 +184,22 @@ UBOOT_DEPENDENCIES += optee-os
>  UBOOT_MAKE_OPTS += TEE=$(BINARIES_DIR)/tee.elf
>  endif
>  
> +ifeq ($(BR2_TARGET_UBOOT_NEEDS_TI_K3_DM),y)
> +# Currently supports the FW from Git tag 08.06.00.006 by default
> +TI_K3_DM_VERSION = 340194800a581baf976360386dfc7b5acab8d948
> +TI_K3_DM_SITE = https://git.ti.com/processor-firmware/ti-linux-firmware/blobs/raw/$(TI_K3_DM_VERSION)/ti-dm/$(BR2_TARGET_UBOOT_TI_K3_DM_SOC)
> +TI_K3_DM_SOURCE = ipc_echo_testb_mcu1_0_release_strip.xer5f
> +# This is not really nice but disable the hash check for the DM FW file. Main
> +# reason is all those DM FW files for different SoCs have the same(!) name in
> +# the Git repository they reside in, so it would be more difficult to distinguish
> +# between them for hash checking purposes. To work around this let's just
> +# rely and trust the official Git repo at ti.com is known-good which is also
> +# accessed through a secure transport.
> +BR_NO_CHECK_HASH_FOR += $(TI_K3_DM_SOURCE)
> +UBOOT_EXTRA_DOWNLOADS = $(TI_K3_DM_SITE)/$(TI_K3_DM_SOURCE)
> +UBOOT_MAKE_OPTS += DM=$(UBOOT_DL_DIR)/$(TI_K3_DM_SOURCE)
> +endif

I again am not very fond of this injecting extra downloads n uboot. I'd
rather we have a separate package, ti-linux-firmware. That way, it can
be used by both uboot and ti-k3-image-gen.

The ti-linux-firmware repository is not small (git clone reports 750MiB
today) but the repository exposes snapshots, so that is a bit more easy
on the networks connection (althoiugh we should take the .gz, not the
.xz, as the on-the-fly compression is much slower for xz than gz).

Then it is again just a matter of ti-linux-firmware copying the
appropriate blobs into $(BINARIES_DIR) and then uboot grabbing what's
necessary.

Regards,
Yann E. MORIN.

>  ifeq ($(BR2_TARGET_UBOOT_NEEDS_OPENSBI),y)
>  UBOOT_DEPENDENCIES += opensbi
>  UBOOT_MAKE_OPTS += OPENSBI=$(BINARIES_DIR)/fw_dynamic.bin
> -- 
> 2.34.1
> 
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