[PATCH v2 05/19] ARM: turn CONFIG_ATAGS off by default
Aaro Koskinen
aaro.koskinen at iki.fi
Thu Jul 2 10:00:48 PDT 2026
Hi,
On Wed, Jul 01, 2026 at 11:23:39PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd at arndb.de>
>
> Only a very small number of machines remain that rely on
> traditional board files with the ATAGS boot data instead
> of devicetree, and we have not accepted new ones for
> a decade.
>
> Most of the remaining ones are on their way out of the
> kernel, but the Kconfig option that controls ATAGS
> is still enabled by default.
>
> To reflect the actual status of ATAGS support and alert
> the remaining users of upstream and out-of-tree platforms
> with this, chanyge it to being default-disabled and
> add a dependency on CONFIG_EXPERT.
>
> The board specific defconfig files that rely on ATAGS
> are changed to turn on both EXPERT and ATAGS if they
> were not doing thath already, and the ones that explicitly
> turned it off before no longer need to.
>
> Acked-by: Linus Walleij <linus.walleij at linaro.org>
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Acked-by: Aaro Koskinen <aaro.koskinen at iki.fi> # OMAP
A.
> ---
> arch/arm/Kconfig | 13 ++++++++-----
> arch/arm/configs/am200epdkit_defconfig | 1 +
> arch/arm/configs/aspeed_g4_defconfig | 1 -
> arch/arm/configs/aspeed_g5_defconfig | 1 -
> arch/arm/configs/assabet_defconfig | 2 ++
> arch/arm/configs/at91_dt_defconfig | 1 -
> arch/arm/configs/collie_defconfig | 1 +
> arch/arm/configs/dove_defconfig | 1 +
> arch/arm/configs/footbridge_defconfig | 1 +
> arch/arm/configs/h3600_defconfig | 2 ++
> arch/arm/configs/integrator_defconfig | 1 -
> arch/arm/configs/jornada720_defconfig | 2 ++
> arch/arm/configs/moxart_defconfig | 1 -
> arch/arm/configs/mps2_defconfig | 1 -
> arch/arm/configs/multi_v4t_defconfig | 1 -
> arch/arm/configs/mv78xx0_defconfig | 1 +
> arch/arm/configs/neponset_defconfig | 2 ++
> arch/arm/configs/netwinder_defconfig | 2 ++
> arch/arm/configs/omap1_defconfig | 1 +
> arch/arm/configs/rpc_defconfig | 2 ++
> arch/arm/configs/s3c6400_defconfig | 2 ++
> arch/arm/configs/sama5_defconfig | 1 -
> arch/arm/configs/sama7_defconfig | 1 -
> arch/arm/configs/spitz_defconfig | 1 +
> arch/arm/configs/stm32_defconfig | 3 ++-
> arch/arm/configs/wpcm450_defconfig | 1 -
> 26 files changed, 31 insertions(+), 16 deletions(-)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 3b2316dc9d13..0033d861e378 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1390,12 +1390,15 @@ config ARCH_WANT_FLAT_DTB_INSTALL
>
> config ATAGS
> bool "Support for the traditional ATAGS boot data passing"
> - default y
> + depends on EXPERT
> help
> - This is the traditional way of passing data to the kernel at boot
> - time. If you are solely relying on the flattened device tree (or
> - the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
> - to remove ATAGS support from your kernel binary.
> + This is the traditional way of passing data to the kernel at
> + boot but is now only used by a few of the oldest ARMv4 and
> + ARMv5 machines. Users that still rely on ATAGS should plan
> + on migrating to devicetree based booting.
> +
> + Support for ATAGS will be removed when the last machine using
> + it is either converted to DT or removed.
>
> config DEPRECATED_PARAM_STRUCT
> bool "Provide old way to pass kernel parameters"
> diff --git a/arch/arm/configs/am200epdkit_defconfig b/arch/arm/configs/am200epdkit_defconfig
> index d4745b0f3dcb..61beac88e863 100644
> --- a/arch/arm/configs/am200epdkit_defconfig
> +++ b/arch/arm/configs/am200epdkit_defconfig
> @@ -7,6 +7,7 @@ CONFIG_EXPERT=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_PXA=y
> CONFIG_ARCH_GUMSTIX=y
> +CONFIG_ATAGS=y
> CONFIG_CMDLINE="console=ttyS0,115200n8 root=1f01 rootfstype=jffs2"
> CONFIG_MODULES=y
> CONFIG_MODULE_UNLOAD=y
> diff --git a/arch/arm/configs/aspeed_g4_defconfig b/arch/arm/configs/aspeed_g4_defconfig
> index 3dcb80157f77..f86dd4ce7d0d 100644
> --- a/arch/arm/configs/aspeed_g4_defconfig
> +++ b/arch/arm/configs/aspeed_g4_defconfig
> @@ -23,7 +23,6 @@ CONFIG_ARCH_ASPEED=y
> CONFIG_MACH_ASPEED_G4=y
> CONFIG_VMSPLIT_2G=y
> CONFIG_UACCESS_WITH_MEMCPY=y
> -# CONFIG_ATAGS is not set
> CONFIG_JUMP_LABEL=y
> CONFIG_STRICT_KERNEL_RWX=y
> # CONFIG_BLK_DEBUG_FS is not set
> diff --git a/arch/arm/configs/aspeed_g5_defconfig b/arch/arm/configs/aspeed_g5_defconfig
> index ec558e57d081..45b937419dbd 100644
> --- a/arch/arm/configs/aspeed_g5_defconfig
> +++ b/arch/arm/configs/aspeed_g5_defconfig
> @@ -29,7 +29,6 @@ CONFIG_VMSPLIT_2G=y
> CONFIG_NR_CPUS=2
> CONFIG_HIGHMEM=y
> CONFIG_UACCESS_WITH_MEMCPY=y
> -# CONFIG_ATAGS is not set
> CONFIG_VFP=y
> CONFIG_NEON=y
> CONFIG_KERNEL_MODE_NEON=y
> diff --git a/arch/arm/configs/assabet_defconfig b/arch/arm/configs/assabet_defconfig
> index df63889b0c4c..e4264fdac2e5 100644
> --- a/arch/arm/configs/assabet_defconfig
> +++ b/arch/arm/configs/assabet_defconfig
> @@ -1,11 +1,13 @@
> CONFIG_SYSVIPC=y
> CONFIG_LOG_BUF_SHIFT=14
> CONFIG_BLK_DEV_INITRD=y
> +CONFIG_EXPERT=y
> CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_SA1100=y
> CONFIG_SA1100_ASSABET=y
> # CONFIG_AEABI is not set
> +CONFIG_ATAGS=y
> CONFIG_CMDLINE="mem=32M console=ttySA0,38400n8 initrd=0xc0800000,3M root=/dev/ram"
> CONFIG_FPE_NWFPE=y
> CONFIG_PM=y
> diff --git a/arch/arm/configs/at91_dt_defconfig b/arch/arm/configs/at91_dt_defconfig
> index 320eb27a6a2e..830c6c0dbdaf 100644
> --- a/arch/arm/configs/at91_dt_defconfig
> +++ b/arch/arm/configs/at91_dt_defconfig
> @@ -19,7 +19,6 @@ CONFIG_SOC_SAM9X60=y
> CONFIG_SOC_SAM9X7=y
> # CONFIG_ATMEL_CLOCKSOURCE_PIT is not set
> CONFIG_UACCESS_WITH_MEMCPY=y
> -# CONFIG_ATAGS is not set
> CONFIG_ARM_APPENDED_DTB=y
> CONFIG_ARM_ATAG_DTB_COMPAT=y
> CONFIG_CMDLINE="console=ttyS0,115200 initrd=0x21100000,25165824 root=/dev/ram0 rw"
> diff --git a/arch/arm/configs/collie_defconfig b/arch/arm/configs/collie_defconfig
> index 165202960438..570a5f8bc57b 100644
> --- a/arch/arm/configs/collie_defconfig
> +++ b/arch/arm/configs/collie_defconfig
> @@ -9,6 +9,7 @@ CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_SA1100=y
> CONFIG_SA1100_COLLIE=y
> +CONFIG_ATAGS=y
> CONFIG_CMDLINE="noinitrd root=/dev/mtdblock2 rootfstype=jffs2 fbcon=rotate:1"
> CONFIG_PM=y
> # CONFIG_SWAP is not set
> diff --git a/arch/arm/configs/dove_defconfig b/arch/arm/configs/dove_defconfig
> index 08271e6719d7..917a864fec74 100644
> --- a/arch/arm/configs/dove_defconfig
> +++ b/arch/arm/configs/dove_defconfig
> @@ -8,6 +8,7 @@ CONFIG_ARCH_MULTI_V7=y
> CONFIG_ARCH_DOVE=y
> CONFIG_MACH_CM_A510=y
> CONFIG_HIGHMEM=y
> +CONFIG_ATAGS=y
> CONFIG_ARM_APPENDED_DTB=y
> CONFIG_ARM_ATAG_DTB_COMPAT=y
> CONFIG_VFP=y
> diff --git a/arch/arm/configs/footbridge_defconfig b/arch/arm/configs/footbridge_defconfig
> index e8bf9847d35d..0872dba5de79 100644
> --- a/arch/arm/configs/footbridge_defconfig
> +++ b/arch/arm/configs/footbridge_defconfig
> @@ -10,6 +10,7 @@ CONFIG_ARCH_FOOTBRIDGE=y
> CONFIG_ARCH_EBSA285_HOST=y
> CONFIG_ARCH_NETWINDER=y
> # CONFIG_AEABI is not set
> +CONFIG_ATAGS=y
> CONFIG_FPE_NWFPE=y
> CONFIG_FPE_NWFPE_XP=y
> CONFIG_MODULES=y
> diff --git a/arch/arm/configs/h3600_defconfig b/arch/arm/configs/h3600_defconfig
> index 0923d331190a..3e8da62d959d 100644
> --- a/arch/arm/configs/h3600_defconfig
> +++ b/arch/arm/configs/h3600_defconfig
> @@ -4,11 +4,13 @@ CONFIG_HIGH_RES_TIMERS=y
> CONFIG_PREEMPT=y
> CONFIG_LOG_BUF_SHIFT=14
> CONFIG_BLK_DEV_INITRD=y
> +CONFIG_EXPERT=y
> CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_SA1100=y
> CONFIG_SA1100_H3600=y
> # CONFIG_CPU_FREQ_STAT is not set
> +CONFIG_ATAGS=y
> CONFIG_MODULES=y
> CONFIG_NET=y
> CONFIG_UNIX=y
> diff --git a/arch/arm/configs/integrator_defconfig b/arch/arm/configs/integrator_defconfig
> index ba38ec810a61..82180381bf3c 100644
> --- a/arch/arm/configs/integrator_defconfig
> +++ b/arch/arm/configs/integrator_defconfig
> @@ -13,7 +13,6 @@ CONFIG_ARCH_INTEGRATOR=y
> CONFIG_ARCH_INTEGRATOR_AP=y
> CONFIG_INTEGRATOR_IMPD1=y
> CONFIG_ARCH_INTEGRATOR_CP=y
> -# CONFIG_ATAGS is not set
> CONFIG_CMDLINE="console=ttyAM0,38400n8 root=/dev/nfs ip=bootp"
> CONFIG_CPU_FREQ=y
> CONFIG_CPU_FREQ_GOV_POWERSAVE=y
> diff --git a/arch/arm/configs/jornada720_defconfig b/arch/arm/configs/jornada720_defconfig
> index 0ebddd083b36..a96cfb81aba5 100644
> --- a/arch/arm/configs/jornada720_defconfig
> +++ b/arch/arm/configs/jornada720_defconfig
> @@ -1,11 +1,13 @@
> CONFIG_SYSVIPC=y
> CONFIG_LOG_BUF_SHIFT=14
> +CONFIG_EXPERT=y
> CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_SA1100=y
> CONFIG_SA1100_JORNADA720=y
> CONFIG_SA1100_JORNADA720_SSP=y
> CONFIG_PM=y
> +CONFIG_ATAGS=y
> CONFIG_MODULES=y
> CONFIG_NET=y
> CONFIG_PACKET=y
> diff --git a/arch/arm/configs/moxart_defconfig b/arch/arm/configs/moxart_defconfig
> index d97d9ea5c34d..699d7ad98dd2 100644
> --- a/arch/arm/configs/moxart_defconfig
> +++ b/arch/arm/configs/moxart_defconfig
> @@ -16,7 +16,6 @@ CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_MOXART=y
> CONFIG_MACH_UC7112LX=y
> -# CONFIG_ATAGS is not set
> CONFIG_ARM_APPENDED_DTB=y
> # CONFIG_SWAP is not set
> # CONFIG_COMPAT_BRK is not set
> diff --git a/arch/arm/configs/mps2_defconfig b/arch/arm/configs/mps2_defconfig
> index e995e50537ef..cacf3876f6e4 100644
> --- a/arch/arm/configs/mps2_defconfig
> +++ b/arch/arm/configs/mps2_defconfig
> @@ -16,7 +16,6 @@ CONFIG_ARCH_MPS2=y
> CONFIG_SET_MEM_PARAM=y
> CONFIG_DRAM_BASE=0x21000000
> CONFIG_DRAM_SIZE=0x1000000
> -# CONFIG_ATAGS is not set
> # CONFIG_SUSPEND is not set
> # CONFIG_BLOCK is not set
> CONFIG_BINFMT_FLAT=y
> diff --git a/arch/arm/configs/multi_v4t_defconfig b/arch/arm/configs/multi_v4t_defconfig
> index 14c93bb59ad6..7b592345db21 100644
> --- a/arch/arm/configs/multi_v4t_defconfig
> +++ b/arch/arm/configs/multi_v4t_defconfig
> @@ -17,7 +17,6 @@ CONFIG_INTEGRATOR_IMPD1=y
> CONFIG_INTEGRATOR_CM720T=y
> CONFIG_INTEGRATOR_CM920T=y
> CONFIG_INTEGRATOR_CM922T_XA10=y
> -# CONFIG_ATAGS is not set
> CONFIG_CPU_IDLE=y
> CONFIG_ARM_CPUIDLE=y
> CONFIG_ARM_CLPS711X_CPUIDLE=y
> diff --git a/arch/arm/configs/mv78xx0_defconfig b/arch/arm/configs/mv78xx0_defconfig
> index 823f7963b8b3..e3cc8de7c1c2 100644
> --- a/arch/arm/configs/mv78xx0_defconfig
> +++ b/arch/arm/configs/mv78xx0_defconfig
> @@ -12,6 +12,7 @@ CONFIG_ARCH_MULTI_V5=y
> CONFIG_ARCH_MV78XX0=y
> CONFIG_MACH_TERASTATION_WXL=y
> CONFIG_HIGHMEM=y
> +CONFIG_ATAGS=y
> CONFIG_VFP=y
> CONFIG_KPROBES=y
> CONFIG_MODULES=y
> diff --git a/arch/arm/configs/neponset_defconfig b/arch/arm/configs/neponset_defconfig
> index 16f0afd770c1..d5d6d57f8fea 100644
> --- a/arch/arm/configs/neponset_defconfig
> +++ b/arch/arm/configs/neponset_defconfig
> @@ -1,12 +1,14 @@
> CONFIG_SYSVIPC=y
> CONFIG_LOG_BUF_SHIFT=14
> CONFIG_BLK_DEV_INITRD=y
> +CONFIG_EXPERT=y
> CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_SA1100=y
> CONFIG_SA1100_ASSABET=y
> CONFIG_ASSABET_NEPONSET=y
> # CONFIG_AEABI is not set
> +CONFIG_ATAGS=y
> CONFIG_ZBOOT_ROM_TEXT=0x80000
> CONFIG_ZBOOT_ROM_BSS=0xc1000000
> CONFIG_ZBOOT_ROM=y
> diff --git a/arch/arm/configs/netwinder_defconfig b/arch/arm/configs/netwinder_defconfig
> index 7ff70439458d..77d4a2b5916b 100644
> --- a/arch/arm/configs/netwinder_defconfig
> +++ b/arch/arm/configs/netwinder_defconfig
> @@ -1,10 +1,12 @@
> CONFIG_SYSVIPC=y
> CONFIG_LOG_BUF_SHIFT=14
> +CONFIG_EXPERT=y
> CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_FOOTBRIDGE=y
> CONFIG_ARCH_NETWINDER=y
> # CONFIG_AEABI is not set
> +CONFIG_ATAGS=y
> CONFIG_DEPRECATED_PARAM_STRUCT=y
> CONFIG_CMDLINE="root=0x801"
> CONFIG_FPE_NWFPE=y
> diff --git a/arch/arm/configs/omap1_defconfig b/arch/arm/configs/omap1_defconfig
> index 8d11ba724204..fcbaaf37bc9b 100644
> --- a/arch/arm/configs/omap1_defconfig
> +++ b/arch/arm/configs/omap1_defconfig
> @@ -28,6 +28,7 @@ CONFIG_MACH_OMAP_PALMTE=y
> CONFIG_MACH_SX1=y
> CONFIG_MACH_NOKIA770=y
> CONFIG_MACH_AMS_DELTA=y
> +CONFIG_ATAGS=y
> CONFIG_CMDLINE="root=1f03 rootfstype=jffs2"
> # CONFIG_SUSPEND is not set
> CONFIG_PM=y
> diff --git a/arch/arm/configs/rpc_defconfig b/arch/arm/configs/rpc_defconfig
> index 8d73ec43cb41..edb52d56f679 100644
> --- a/arch/arm/configs/rpc_defconfig
> +++ b/arch/arm/configs/rpc_defconfig
> @@ -2,12 +2,14 @@
> CONFIG_SYSVIPC=y
> CONFIG_LOG_BUF_SHIFT=14
> CONFIG_BLK_DEV_INITRD=y
> +CONFIG_EXPERT=y
> CONFIG_ARCH_MULTI_V4=y
> # CONFIG_ARCH_MULTI_V7 is not set
> CONFIG_ARCH_RPC=y
> CONFIG_CPU_SA110=y
> CONFIG_FPE_NWFPE=y
> # CONFIG_AEABI is not set
> +CONFIG_ATAGS=y
> CONFIG_MODULES=y
> CONFIG_MODULE_UNLOAD=y
> CONFIG_PARTITION_ADVANCED=y
> diff --git a/arch/arm/configs/s3c6400_defconfig b/arch/arm/configs/s3c6400_defconfig
> index 7bf28a83946a..a0707707d960 100644
> --- a/arch/arm/configs/s3c6400_defconfig
> +++ b/arch/arm/configs/s3c6400_defconfig
> @@ -2,8 +2,10 @@ CONFIG_BLK_DEV_INITRD=y
> CONFIG_KALLSYMS_ALL=y
> CONFIG_ARCH_MULTI_V6=y
> # CONFIG_ARCH_MULTI_V7 is not set
> +CONFIG_EXPERT=y
> CONFIG_ARCH_S3C64XX=y
> CONFIG_MACH_WLF_CRAGG_6410=y
> +CONFIG_ATAGS=y
> CONFIG_CMDLINE="console=ttySAC0,115200 root=/dev/ram init=/linuxrc initrd=0x51000000,6M ramdisk_size=6144"
> CONFIG_VFP=y
> CONFIG_MODULES=y
> diff --git a/arch/arm/configs/sama5_defconfig b/arch/arm/configs/sama5_defconfig
> index bd7f0b5f7d66..1eafad9139f1 100644
> --- a/arch/arm/configs/sama5_defconfig
> +++ b/arch/arm/configs/sama5_defconfig
> @@ -13,7 +13,6 @@ CONFIG_SOC_SAMA5D3=y
> CONFIG_SOC_SAMA5D4=y
> # CONFIG_ATMEL_CLOCKSOURCE_PIT is not set
> CONFIG_UACCESS_WITH_MEMCPY=y
> -# CONFIG_ATAGS is not set
> CONFIG_CMDLINE="console=ttyS0,115200 initrd=0x21100000,25165824 root=/dev/ram0 rw"
> CONFIG_VFP=y
> CONFIG_NEON=y
> diff --git a/arch/arm/configs/sama7_defconfig b/arch/arm/configs/sama7_defconfig
> index cc7f6daf9fc7..4af87c57483d 100644
> --- a/arch/arm/configs/sama7_defconfig
> +++ b/arch/arm/configs/sama7_defconfig
> @@ -20,7 +20,6 @@ CONFIG_ATMEL_CLOCKSOURCE_TCB=y
> # CONFIG_CPU_SW_DOMAIN_PAN is not set
> CONFIG_ARCH_FORCE_MAX_ORDER=14
> CONFIG_UACCESS_WITH_MEMCPY=y
> -# CONFIG_ATAGS is not set
> CONFIG_CMDLINE="console=ttyS0,115200 earlyprintk ignore_loglevel"
> CONFIG_CPU_FREQ=y
> CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE=y
> diff --git a/arch/arm/configs/spitz_defconfig b/arch/arm/configs/spitz_defconfig
> index d68a8f9cdad4..c7cf089001bf 100644
> --- a/arch/arm/configs/spitz_defconfig
> +++ b/arch/arm/configs/spitz_defconfig
> @@ -10,6 +10,7 @@ CONFIG_ARCH_PXA=y
> CONFIG_PXA_SHARPSL=y
> CONFIG_MACH_AKITA=y
> CONFIG_MACH_BORZOI=y
> +CONFIG_ATAGS=y
> CONFIG_CMDLINE="console=ttyS0,115200n8 console=tty1 noinitrd root=/dev/mtdblock2 rootfstype=jffs2 debug"
> CONFIG_MODULES=y
> CONFIG_MODULE_UNLOAD=y
> diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
> index 82190b155b14..bdf3bb9e03a8 100644
> --- a/arch/arm/configs/stm32_defconfig
> +++ b/arch/arm/configs/stm32_defconfig
> @@ -20,7 +20,8 @@ CONFIG_ARCH_STM32=y
> CONFIG_CPU_V7M_NUM_IRQ=240
> CONFIG_SET_MEM_PARAM=y
> CONFIG_DRAM_BASE=0x90000000
> -# CONFIG_ATAGS is not set
> +CONFIG_FLASH_MEM_BASE=0x08000000
> +CONFIG_FLASH_SIZE=0x00200000
> CONFIG_XIP_KERNEL=y
> CONFIG_XIP_PHYS_ADDR=0x08008000
> # CONFIG_SUSPEND is not set
> diff --git a/arch/arm/configs/wpcm450_defconfig b/arch/arm/configs/wpcm450_defconfig
> index 9cb379077d70..7512ec4292a0 100644
> --- a/arch/arm/configs/wpcm450_defconfig
> +++ b/arch/arm/configs/wpcm450_defconfig
> @@ -14,7 +14,6 @@ CONFIG_ARCH_NPCM=y
> CONFIG_ARCH_WPCM450=y
> CONFIG_CPU_DCACHE_WRITETHROUGH=y
> CONFIG_UACCESS_WITH_MEMCPY=y
> -# CONFIG_ATAGS is not set
> CONFIG_ARM_APPENDED_DTB=y
> CONFIG_CPU_IDLE=y
> CONFIG_KPROBES=y
> --
> 2.39.5
>
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