[PATCH v2 0/6] arm: snapdragon: Add snagboot support for Lemans-EVK

[Balaji Selvanathan]

This series adds support for running U-Boot in snagboot mode on
Qualcomm Snapdragon platforms, targeting the Lemans-EVK board.

In snagboot mode, XBL loads U-Boot directly without initializing
PSCI firmware or populating the Command DB. U-Boot then enters
fastboot immediately, enabling partition flashing for manufacturing
and recovery use cases.

Patch 1 changes SYSRESET_PSCI from 'select' to 'imply' so it can
be disabled on platforms where PSCI firmware is unavailable.

Patch 2 guards show_psci_version() and qcom_psci_fixup() with
CONFIG_ARM_SMCCC to prevent build failures when SMCCC is disabled.

Patch 3 disables the MMU and invalidates TLBs at the earliest entry
point to clear stale page tables left by previous bootloader
before U-Boot sets up its own MMU.

Patch 4 adds QCOM_COMMAND_DB_OPTIONAL to allow the CMD DB driver to
bind successfully when CMD DB data is not populated by XBL, logging
a warning instead of failing.

Patch 5 adds qcom_lemans_snagboot_defconfig for Lemans-EVK, based
on qcom_defconfig with snagboot-specific settings: SCSI-backed
environment, optional CMD DB, PSCI reset disabled, and a bootcmd
that auto-enters fastboot over USB with zero boot delay.

Patch 6 adds the new defconfig to the ARM SNAPDRAGON section in
MAINTAINERS.

Signed-off-by: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
---
Changes in v2:
- Changed SYSRESET_PSCI from 'select' to 'imply'
- Guard show_psci_version() and qcom_psci_fixup() with CONFIG_ARM_SMCCC
- Disables the MMU and invalidates TLBs at the earliest entry point
- Add qcom_lemans_snagboot_defconfig for Lemans-EVK
- Link to v1: https://lore.kernel.org/u-boot/20260409-cmddb-v1-1-b10549b34133@oss.qualcomm.com/

---
Balaji Selvanathan (6):
      arm: snapdragon: Make SYSRESET_PSCI optional
      arm: snapdragon: Guard PSCI functions with CONFIG_ARM_SMCCC
      arm: snapdragon: Disable MMU early before U-Boot reset vector
      soc: qcom: cmd-db: Allow boot without CMD DB data
      configs: add qcom_lemans_snagboot_defconfig for Lemans-EVK
      MAINTAINERS: add qcom_lemans_snagboot_defconfig to ARM SNAPDRAGON

 MAINTAINERS                                   |  1 +
 arch/arm/Kconfig                              |  2 +-
 arch/arm/mach-snapdragon/board.c              | 14 ++++++++
 arch/arm/mach-snapdragon/include/mach/boot0.h | 46 +++++++++++++++++++++++++
 configs/qcom_lemans_snagboot_defconfig        | 49 +++++++++++++++++++++++++++
 drivers/soc/qcom/Kconfig                      | 16 +++++++++
 drivers/soc/qcom/cmd-db.c                     | 10 ++++++
 7 files changed, 137 insertions(+), 1 deletion(-)
---
base-commit: 26fe27b4eaddcf73e4472368a71703a68e2f67d9
change-id: 20260608-snagboot-df4b6a79a086

Best regards,
-- 
Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>