Migration Schedule

U-Boot has been migrating to a new driver model since its introduction in 2014. This file describes the schedule for deprecation of pre-driver-model features.

CONFIG_DM

  • Status: In progress

  • Deadline: 2020.01

Starting with the 2020.01 release CONFIG_DM will be enabled for all boards. This does not concern CONFIG_DM_SPL and CONFIG_DM_TPL. The conversion date for these configuration items still needs to be defined.

CONFIG_DM_MMC

  • Status: In progress

  • Deadline: 2019.04

The subsystem itself has been converted and maintainers should submit patches switching over to using CONFIG_DM_MMC and other base driver model options in time for inclusion in the 2019.04 rerelease.

CONFIG_DM_USB

  • Status: In progress

  • Deadline: 2019.07

The subsystem itself has been converted along with many of the host controller and maintainers should submit patches switching over to using CONFIG_DM_USB and other base driver model options in time for inclusion in the 2019.07 rerelease.

CONFIG_SATA

  • Status: In progress

  • Deadline: 2019.07

The subsystem itself has been converted along with many of the host controller and maintainers should submit patches switching over to using CONFIG_AHCI and other base driver model options in time for inclusion in the 2019.07 rerelease.

CONFIG_BLK

  • Status: In progress

  • Deadline: 2019.07

In concert with maintainers migrating their block device usage to the appropriate DM driver, CONFIG_BLK needs to be set as well. The final deadline here coincides with the final deadline for migration of the various block subsystems. At this point we will be able to audit and correct the logic in Kconfig around using CONFIG_PARTITIONS and CONFIG_SPL_LEGACY_BLOCK and make use of CONFIG_BLK / CONFIG_SPL_BLK as needed.

CONFIG_DM_SPI / CONFIG_DM_SPI_FLASH

Board Maintainers should submit the patches for enabling DM_SPI and DM_SPI_FLASH to move the migration with in the deadline.

Partially converted:

drivers/spi/fsl_espi.c
drivers/spi/mxc_spi.c
drivers/spi/sh_qspi.c

  • Status: In progress

  • Deadline: 2019.07

CONFIG_DM_VIDEO

Deadline: 2019.07

The video subsystem has supported driver model since early 2016. Maintainers should submit patches switching over to using CONFIG_VIDEO and other base driver model options in time for inclusion in the 2019.07 release.

CONFIG_DM_ETH

Deadline: 2020.07

The network subsystem has supported the driver model since early 2015. Maintainers should submit patches switching over to using CONFIG_DM_ETH and other base driver model options in time for inclusion in the 2020.07 release.

CONFIG_DM_I2C

Deadline: 2021.10

The I2C subsystem has supported the driver model since early 2015. Maintainers should submit patches switching over to using CONFIG_DM_I2C and other base driver model options in time for inclusion in the 2021.10 release.

CFG_SYS_TIMER_RATE and CFG_SYS_TIMER_COUNTER

Deadline: 2023.01

These are legacy options which have been replaced by driver model. Maintainers should submit patches switching over to using CONFIG_TIMER and other base driver model options in time for inclusion in the 2022.10 release.

There is only one method to implement, unless you want to support bootstage, in which case you need an early timer also. For example drivers, see sandbox_timer.c and rockchip_timer.c

CONFIG_DM_SERIAL

Deadline: 2023.04

The serial subsystem has supported the driver model since late 2014. Maintainers should submit patches switching over to using CONFIG_DM_SERIAL and other base driver model options in time for inclusion in the 2022.10 release.