config DM bool "Enable Driver Model" help This config option enables Driver Model. This brings in the core support, including scanning of platform data on start-up. If CONFIG_OF_CONTROL is enabled, the device tree will be scanned also when available. config SPL_DM bool "Enable Driver Model for SPL" depends on DM && SPL help Enable driver model in SPL. You will need to provide a suitable malloc() implementation. If you are not using the full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START, consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you must provide CONFIG_SYS_MALLOC_F_LEN to set the size. In most cases driver model will only allocate a few uclasses and devices in SPL, so 1KB should be enable. See CONFIG_SYS_MALLOC_F_LEN for more details on how to enable it. config DM_WARN bool "Enable warnings in driver model" depends on DM default y help The dm_warn() function can use up quite a bit of space for its strings. By default this is disabled for SPL builds to save space. This will cause dm_warn() to be compiled out - it will do nothing when called. config DM_DEVICE_REMOVE bool "Support device removal" depends on DM default y help We can save some code space by dropping support for removing a device. This is not normally required in SPL, so by default this option is disabled for SPL. config DM_STDIO bool "Support stdio registration" depends on DM default y help Normally serial drivers register with stdio so that they can be used as normal output devices. In SPL we don't normally use stdio, so we can omit this feature.