[PATCH v3 1/6] imx9: Add support for saving DDR training data to NVM

[Simon Glass]

Hi,

On Thu, 2 Apr 2026 at 03:29, Simona Toaca (OSS)
<simona.toaca at oss.nxp.com> wrote:
>
> From: Simona Toaca <simona.toaca at nxp.com>
>
> DDR training data can be saved to NVM and be available
> to OEI at boot time, which will trigger QuickBoot flow.
>
> U-Boot only checks for data integrity (CRC32), while
> OEI is in charge of authentication when it tries to
> load the data from NVM.
>
> On iMX95 A0/A1, 'authentication' is done via another
> CRC32. On the other boards, authentication is done by
> using ELE to check the MAC stored in the ddrphy_qb_state
> structure.
>
> Supported platforms: iMX94, iMX95, iMX952 (using OEI)
> Supported storage types: eMMC, SD, SPI flash.
>
> Signed-off-by: Viorel Suman <viorel.suman at nxp.com>
> Signed-off-by: Ye Li <ye.li at nxp.com>
> Signed-off-by: Simona Toaca <simona.toaca at nxp.com>
> ---
>  arch/arm/include/asm/arch-imx9/ddr.h |  48 +++-
>  arch/arm/include/asm/mach-imx/qb.h   |  15 ++
>  arch/arm/mach-imx/imx9/Makefile      |   6 +-
>  arch/arm/mach-imx/imx9/qb.c          | 379 +++++++++++++++++++++++++++
>  arch/arm/mach-imx/imx9/scmi/soc.c    |   7 +
>  drivers/ddr/imx/imx9/Kconfig         |   7 +
>  6 files changed, 459 insertions(+), 3 deletions(-)
>  create mode 100644 arch/arm/include/asm/mach-imx/qb.h
>  create mode 100644 arch/arm/mach-imx/imx9/qb.c

Note that this feature is present on x86 boards already.

I wonder if we could make this more generic? E.g. it could be a
function of UCLASS_RAM ? I could do the x86 part to try it out if you
like.

Regards,
Simon