Re: [PATCH v2] ARM: i.MX8MP: adapt atf bl31 base addr

[Lucas Stach <l.stach@pengutronix.de>]

Am Montag, dem 04.07.2022 um 16:27 +0200 schrieb Marco Felsch:
> The usptream TF-A was shifting around the base address from version to
> version. But finally with upstream TF-A v2.7 it is correctly set to
> 0x970000. This change was done since the first official silicon has an
> SRAM size of 576KB where as the tapeout version A1 (pre-silicion) had
> only 512KB.

Now this doesn't match the commit message in the TF-A, which claims
that tapeout A0 (pre-release silicon) had 512K SRAM, while it was
extended to 576KB in the A1 tapeout, which is the current mass produced
version.

> 
> The upstream TF-A has adapt it in verion v2.5 so the BL31 blob is at the
                        ^ adapted   ^version
> end of the SRAM. Unfortunately they had (accidental) reverted back to

Who is they? "Unfortunately it was reverted back..."
> 0x960000 in v2.6. They noticed that and changed (again) back to 0x970000.
> with v2.7.
> 
> This commit also adapts the documentation for the i.MX8MP-EVK to
> reference the upstream TF-A. The new warning should point out that we
> strongly recommended to use versions from v2.7 onwards, due to the
           ^ recommend
> version mess explained above.
> 
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> ---
> Changelog:
> 
> v2:
> - fix commit message ger/eng mixup and mention tapeout version A1
> 
>  Documentation/boards/imx/nxp-imx8mp-evk.rst | 11 +++++++----
>  arch/arm/mach-imx/include/mach/atf.h        |  2 +-
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/boards/imx/nxp-imx8mp-evk.rst b/Documentation/boards/imx/nxp-imx8mp-evk.rst
> index 366c1de500..1074992f2f 100644
> --- a/Documentation/boards/imx/nxp-imx8mp-evk.rst
> +++ b/Documentation/boards/imx/nxp-imx8mp-evk.rst
> @@ -40,15 +40,18 @@ As a last step of this process those files need to be placed in
>  	      firmware/${f}; \
>    done
>  
> -Get and Build the ARM Trusted firmware
> ---------------------------------------
> +Get and Build the Trusted Firmware A
> +------------------------------------
>  
> -Get ATF from https://source.codeaurora.org/external/imx/imx-atf, branch
> -imx_5.4.3_2.0.0::
> +Get TF-A from https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/ and
> +checkout version v2.7::
>  
>    make PLAT=imx8mp bl31
>    cp build/imx8mp/release/bl31.bin ${barebox_srctree}/imx8mp-bl31.bin
>  
> +.. warning:: It is important to use a version >= v2.7 else your system
> +   might not boot.

This doesn't tell anyone what's going on, I think we can bother the
reader with the details: "It is important to use a version >= v2.7, as
Barebox expects the BL31 SRAM load address used from this release
onwards."

> +
>  Build Barebox
>  -------------
>  
> diff --git a/arch/arm/mach-imx/include/mach/atf.h b/arch/arm/mach-imx/include/mach/atf.h
> index 09396f4646..bc400ddbad 100644
> --- a/arch/arm/mach-imx/include/mach/atf.h
> +++ b/arch/arm/mach-imx/include/mach/atf.h
> @@ -10,7 +10,7 @@
>  
>  #define MX8MM_ATF_BL31_BASE_ADDR	0x00920000
>  #define MX8MN_ATF_BL31_BASE_ADDR	0x00960000
> -#define MX8MP_ATF_BL31_BASE_ADDR	0x00960000
> +#define MX8MP_ATF_BL31_BASE_ADDR	0x00970000
>  #define MX8MQ_ATF_BL31_BASE_ADDR	0x00910000
>  #define MX8M_ATF_BL33_BASE_ADDR		0x40200000
>  #define MX8MM_ATF_BL33_BASE_ADDR	MX8M_ATF_BL33_BASE_ADDR