Add CONFIG_QCOM_SNAGBOOT_MODE to enable snagboot mode on Qualcomm platforms. This config automatically selects the required dependencies.
Add QCOM_BOOT0_SNAGBOOT_MODE as boot0.h config for automatic selection by QCOM_SNAGBOOT_MODE. Document the platform-specific requirements and configs that must be disabled in snagboot mode. Signed-off-by: Balaji Selvanathan <[email protected]> --- Changes in v4: - Renamed QCOM_SNAGBOOT_SUPPORT to QCOM_SNAGBOOT_MODE - Added QCOM_BOOT0_SNAGBOOT_MODE for boot0.h which gets selected by QCOM_SNAGBOOT_MODE - Document the platform-specific requirements and configs that must be disabled in snagboot mode. Changes in v3: - Newly introduced in v3 --- arch/arm/mach-snapdragon/Kconfig | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig index 931d25c1023..5c7dbe0dcc4 100644 --- a/arch/arm/mach-snapdragon/Kconfig +++ b/arch/arm/mach-snapdragon/Kconfig @@ -65,4 +65,32 @@ config QCOM_EL2_GUNYAH_EXIT_SUPPORT run properly at EL2. endchoice +config QCOM_BOOT0_SNAGBOOT_MODE + bool "boot0.h initialization for Snagboot mode" + help + Enable boot0.h early initialization required when U-Boot + is loaded in Snagboot mode by XBL. + +config QCOM_SNAGBOOT_MODE + bool "Build U-Boot for Snagboot mode loading" + select QCOM_BOOT0_SNAGBOOT_MODE + select ENABLE_ARM_SOC_BOOT0_HOOK + select SKIP_RELOCATE + help + Build U-Boot to be loaded in Snagboot mode on Qualcomm platforms + for device/factory provisioning using fastboot. + + Snagboot mode requires disabling several configs in your defconfig: + - PSCI_RESET: Not available in Snagboot mode + - IOMMU: Not initialized by XBL in Snagboot mode + - SAVE_PREV_BL_INITRAMFS_START_ADDR: Previous bootloader context + is not preserved in snagboot mode + - REBOOT_MODE_ENV_UPDATE: Not applicable in device/factory provisioning mode + + Additionally, use CONFIG_ENV_IS_NOWHERE to ensure recovery works + even with corrupted environment storage. + + Platform-specific requirements: + - Set CONFIG_COUNTER_FREQUENCY to match your platform's timer + - Configure CONFIG_TEXT_BASE for U-Boot load address endif -- 2.34.1
