[PATCH 1/1 RFC] treewide: Deprecate OF_PRIOR_STAGE

Ilias Apalodimas ilias.apalodimas at linaro.org
Fri Sep 24 15:12:51 CEST 2021


Forgot to include Mark, which showed some interest for MBPs

On Fri, 24 Sept 2021 at 16:10, Ilias Apalodimas
<ilias.apalodimas at linaro.org> wrote:
>
> At some point back in 2018 prior_stage_fdt_address and OF_PRIOR_STAGE got
> introduced,  in order to support a DTB handed over by an earlier stage boot
> loader.  However we have another option in the Kconfig (OF_BOARD) which has
> identical semantics.
>
> A good example of this is RISC-V boards which during their startup,
> pick up the DTB from a1 and copy it in their private gd_t.  Apart from that
> they also copy it to prior_stage_fdt_address,  if the Kconfig option is
> selected,  which seems unnecessary(??).
>
> This is mostly an RFC,  trying to figure out if I am missing some subtle
> functionality,  which would justify having 2 Kconfig options doing similar
> things present.
>
> - Should we do this?
> - Doesn't OF_BOARD and OF_PRIOR_STAGE practically mean "Someone else is
>   going to pass me my DTB".  Why should we care if that someone is a prior
>   bootloader or runtime memory generated on the fly by U-Boot?  It all
>   boils down to having a *board* specific callback for that.
> - RISC-V binman should get rid of the option as well if we decide to go
>   though with this (but I have no idea what RISC-V expects there).
> - Can we apply similar logic to OF_HOSTFILE?  It seems like we could just
>   have a board_fdt_blob_setup() for the sandbox that reads the file we
>   want and get rid of another Kconfig option.
>
> Note that the original board which introduced CONFIG_OF_PRIOR_STAGE is still
> there.  If someone cares enough I guess he could fix that as well, but I don't
> have the board around, so I prefer keeping it as is and mark the option as
> deprecated. For that board we could  also keep the prior_stage_fdt_address
> without the Kconfig option and simply copy the location there, but the
> board must define it's own board_fdt_blob_setup().  That would get rid of
> the Kconfig option entirely instead of limiting it to that board only.
>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> ---
>  arch/riscv/cpu/cpu.c                    |  3 ---
>  arch/riscv/cpu/start.S                  |  5 -----
>  board/emulation/qemu-riscv/qemu-riscv.c |  8 ++++++++
>  board/sifive/unleashed/unleashed.c      | 10 ++++------
>  board/sifive/unmatched/unmatched.c      | 10 ++++------
>  configs/ae350_rv32_defconfig            |  2 +-
>  configs/ae350_rv32_spl_defconfig        |  2 +-
>  configs/ae350_rv64_defconfig            |  2 +-
>  configs/ae350_rv64_spl_defconfig        |  2 +-
>  configs/bcm7260_defconfig               |  2 +-
>  configs/qemu-riscv32_defconfig          |  2 +-
>  configs/qemu-riscv32_smode_defconfig    |  2 +-
>  configs/qemu-riscv32_spl_defconfig      |  2 +-
>  configs/qemu-riscv64_defconfig          |  2 +-
>  configs/qemu-riscv64_smode_defconfig    |  2 +-
>  configs/qemu-riscv64_spl_defconfig      |  2 +-
>  dts/Kconfig                             |  3 ++-
>  lib/fdtdec.c                            |  4 ++++
>  18 files changed, 33 insertions(+), 32 deletions(-)
>
> diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c
> index c894ac10b536..e16f1df30254 100644
> --- a/arch/riscv/cpu/cpu.c
> +++ b/arch/riscv/cpu/cpu.c
> @@ -16,9 +16,6 @@
>   * The variables here must be stored in the data section since they are used
>   * before the bss section is available.
>   */
> -#ifdef CONFIG_OF_PRIOR_STAGE
> -phys_addr_t prior_stage_fdt_address __section(".data");
> -#endif
>  #ifndef CONFIG_XIP
>  u32 hart_lottery __section(".data") = 0;
>
> diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S
> index 308b0a97a58f..76850ec9be2c 100644
> --- a/arch/riscv/cpu/start.S
> +++ b/arch/riscv/cpu/start.S
> @@ -142,11 +142,6 @@ call_harts_early_init:
>         bnez    tp, secondary_hart_loop
>  #endif
>
> -#ifdef CONFIG_OF_PRIOR_STAGE
> -       la      t0, prior_stage_fdt_address
> -       SREG    s1, 0(t0)
> -#endif
> -
>         jal     board_init_f_init_reserve
>
>         SREG    s1, GD_FIRMWARE_FDT_ADDR(gp)
> diff --git a/board/emulation/qemu-riscv/qemu-riscv.c b/board/emulation/qemu-riscv/qemu-riscv.c
> index dcfd3f20bee6..7dfe471dee15 100644
> --- a/board/emulation/qemu-riscv/qemu-riscv.c
> +++ b/board/emulation/qemu-riscv/qemu-riscv.c
> @@ -14,6 +14,8 @@
>  #include <virtio_types.h>
>  #include <virtio.h>
>
> +DECLARE_GLOBAL_DATA_PTR;
> +
>  int board_init(void)
>  {
>         /*
> @@ -69,3 +71,9 @@ int board_fit_config_name_match(const char *name)
>         return 0;
>  }
>  #endif
> +void *board_fdt_blob_setup(void)
> +{
> +       /* Stored the DTB address there during our init */
> +       return (void *)gd->arch.firmware_fdt_addr;
> +}
> +
> diff --git a/board/sifive/unleashed/unleashed.c b/board/sifive/unleashed/unleashed.c
> index 8cd514df3005..9aa2b3e6f43a 100644
> --- a/board/sifive/unleashed/unleashed.c
> +++ b/board/sifive/unleashed/unleashed.c
> @@ -116,12 +116,10 @@ int misc_init_r(void)
>
>  void *board_fdt_blob_setup(void)
>  {
> -       if (IS_ENABLED(CONFIG_OF_SEPARATE)) {
> -               if (gd->arch.firmware_fdt_addr)
> -                       return (ulong *)gd->arch.firmware_fdt_addr;
> -               else
> -                       return (ulong *)&_end;
> -       }
> +       if (gd->arch.firmware_fdt_addr)
> +               return (ulong *)gd->arch.firmware_fdt_addr;
> +       else
> +               return (ulong *)&_end;
>  }
>
>  int board_init(void)
> diff --git a/board/sifive/unmatched/unmatched.c b/board/sifive/unmatched/unmatched.c
> index d90b252baef7..b703f9c3efc3 100644
> --- a/board/sifive/unmatched/unmatched.c
> +++ b/board/sifive/unmatched/unmatched.c
> @@ -13,12 +13,10 @@
>
>  void *board_fdt_blob_setup(void)
>  {
> -       if (IS_ENABLED(CONFIG_OF_SEPARATE)) {
> -               if (gd->arch.firmware_fdt_addr)
> -                       return (ulong *)gd->arch.firmware_fdt_addr;
> -               else
> -                       return (ulong *)&_end;
> -       }
> +       if (gd->arch.firmware_fdt_addr)
> +               return (ulong *)gd->arch.firmware_fdt_addr;
> +       else
> +               return (ulong *)&_end;
>  }
>
>  int board_init(void)
> diff --git a/configs/ae350_rv32_defconfig b/configs/ae350_rv32_defconfig
> index 4e7a1686a64d..8b6c0b8a4a0a 100644
> --- a/configs/ae350_rv32_defconfig
> +++ b/configs/ae350_rv32_defconfig
> @@ -15,7 +15,7 @@ CONFIG_CMD_SF_TEST=y
>  # CONFIG_CMD_SETEXPR is not set
>  CONFIG_BOOTP_PREFER_SERVERIP=y
>  CONFIG_CMD_CACHE=y
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_ENV_OVERWRITE=y
>  CONFIG_ENV_IS_IN_SPI_FLASH=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
> diff --git a/configs/ae350_rv32_spl_defconfig b/configs/ae350_rv32_spl_defconfig
> index 34c6af6e7e17..a0fe9b9a71df 100644
> --- a/configs/ae350_rv32_spl_defconfig
> +++ b/configs/ae350_rv32_spl_defconfig
> @@ -19,7 +19,7 @@ CONFIG_CMD_SF_TEST=y
>  # CONFIG_CMD_SETEXPR is not set
>  CONFIG_BOOTP_PREFER_SERVERIP=y
>  CONFIG_CMD_CACHE=y
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_ENV_OVERWRITE=y
>  CONFIG_ENV_IS_IN_SPI_FLASH=y
>  CONFIG_BOOTP_SEND_HOSTNAME=y
> diff --git a/configs/ae350_rv64_defconfig b/configs/ae350_rv64_defconfig
> index 05eee371ac2f..b12a8810a221 100644
> --- a/configs/ae350_rv64_defconfig
> +++ b/configs/ae350_rv64_defconfig
> @@ -16,7 +16,7 @@ CONFIG_CMD_SF_TEST=y
>  # CONFIG_CMD_SETEXPR is not set
>  CONFIG_BOOTP_PREFER_SERVERIP=y
>  CONFIG_CMD_CACHE=y
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_board=y
>  CONFIG_ENV_OVERWRITE=y
>  CONFIG_ENV_IS_IN_SPI_FLASH=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
> diff --git a/configs/ae350_rv64_spl_defconfig b/configs/ae350_rv64_spl_defconfig
> index 9cd7848c92eb..9ad312505db3 100644
> --- a/configs/ae350_rv64_spl_defconfig
> +++ b/configs/ae350_rv64_spl_defconfig
> @@ -20,7 +20,7 @@ CONFIG_CMD_SF_TEST=y
>  # CONFIG_CMD_SETEXPR is not set
>  CONFIG_BOOTP_PREFER_SERVERIP=y
>  CONFIG_CMD_CACHE=y
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_ENV_OVERWRITE=y
>  CONFIG_ENV_IS_IN_SPI_FLASH=y
>  CONFIG_BOOTP_SEND_HOSTNAME=y
> diff --git a/configs/bcm7260_defconfig b/configs/bcm7260_defconfig
> index a42a6acb06d5..be0c945dc811 100644
> --- a/configs/bcm7260_defconfig
> +++ b/configs/bcm7260_defconfig
> @@ -22,7 +22,7 @@ CONFIG_CMD_CACHE=y
>  CONFIG_CMD_EXT2=y
>  CONFIG_CMD_EXT4=y
>  CONFIG_CMD_FS_GENERIC=y
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_ENV_OVERWRITE=y
>  CONFIG_ENV_IS_IN_MMC=y
>  CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
> diff --git a/configs/qemu-riscv32_defconfig b/configs/qemu-riscv32_defconfig
> index 8ac16cf4186e..6fe133c268d7 100644
> --- a/configs/qemu-riscv32_defconfig
> +++ b/configs/qemu-riscv32_defconfig
> @@ -9,6 +9,6 @@ CONFIG_DISPLAY_BOARDINFO=y
>  CONFIG_CMD_BOOTEFI_SELFTEST=y
>  CONFIG_CMD_NVEDIT_EFI=y
>  # CONFIG_CMD_MII is not set
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
>  CONFIG_DM_MTD=y
> diff --git a/configs/qemu-riscv32_smode_defconfig b/configs/qemu-riscv32_smode_defconfig
> index 05eda439618f..c67e8206d1ab 100644
> --- a/configs/qemu-riscv32_smode_defconfig
> +++ b/configs/qemu-riscv32_smode_defconfig
> @@ -10,6 +10,6 @@ CONFIG_DISPLAY_BOARDINFO=y
>  CONFIG_CMD_BOOTEFI_SELFTEST=y
>  CONFIG_CMD_NVEDIT_EFI=y
>  # CONFIG_CMD_MII is not set
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
>  CONFIG_DM_MTD=y
> diff --git a/configs/qemu-riscv32_spl_defconfig b/configs/qemu-riscv32_spl_defconfig
> index ee81e552724d..77e81fac3af7 100644
> --- a/configs/qemu-riscv32_spl_defconfig
> +++ b/configs/qemu-riscv32_spl_defconfig
> @@ -12,6 +12,6 @@ CONFIG_DISPLAY_CPUINFO=y
>  CONFIG_DISPLAY_BOARDINFO=y
>  CONFIG_CMD_SBI=y
>  # CONFIG_CMD_MII is not set
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
>  CONFIG_DM_MTD=y
> diff --git a/configs/qemu-riscv64_defconfig b/configs/qemu-riscv64_defconfig
> index daf5d655d01f..90e87672aab0 100644
> --- a/configs/qemu-riscv64_defconfig
> +++ b/configs/qemu-riscv64_defconfig
> @@ -10,6 +10,6 @@ CONFIG_DISPLAY_BOARDINFO=y
>  CONFIG_CMD_BOOTEFI_SELFTEST=y
>  CONFIG_CMD_NVEDIT_EFI=y
>  # CONFIG_CMD_MII is not set
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
>  CONFIG_DM_MTD=y
> diff --git a/configs/qemu-riscv64_smode_defconfig b/configs/qemu-riscv64_smode_defconfig
> index 4a6416e2540b..0a8393903368 100644
> --- a/configs/qemu-riscv64_smode_defconfig
> +++ b/configs/qemu-riscv64_smode_defconfig
> @@ -13,6 +13,6 @@ CONFIG_DISPLAY_BOARDINFO=y
>  CONFIG_CMD_BOOTEFI_SELFTEST=y
>  CONFIG_CMD_NVEDIT_EFI=y
>  # CONFIG_CMD_MII is not set
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
>  CONFIG_DM_MTD=y
> diff --git a/configs/qemu-riscv64_spl_defconfig b/configs/qemu-riscv64_spl_defconfig
> index 429d4d814e65..a15e82dd3ee1 100644
> --- a/configs/qemu-riscv64_spl_defconfig
> +++ b/configs/qemu-riscv64_spl_defconfig
> @@ -13,6 +13,6 @@ CONFIG_DISPLAY_CPUINFO=y
>  CONFIG_DISPLAY_BOARDINFO=y
>  CONFIG_CMD_SBI=y
>  # CONFIG_CMD_MII is not set
> -CONFIG_OF_PRIOR_STAGE=y
> +CONFIG_OF_BOARD=y
>  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
>  CONFIG_DM_MTD=y
> diff --git a/dts/Kconfig b/dts/Kconfig
> index dabe0080c1ef..2c5b2ec2d1f8 100644
> --- a/dts/Kconfig
> +++ b/dts/Kconfig
> @@ -107,7 +107,7 @@ config OF_EMBED
>           Boards in the mainline U-Boot tree should not use it.
>
>  config OF_BOARD
> -       bool "Provided by the board at runtime"
> +       bool "Provided by the board (e.g a previous loader) at runtime"
>         depends on !SANDBOX
>         help
>           If this option is enabled, the device tree will be provided by
> @@ -124,6 +124,7 @@ config OF_HOSTFILE
>
>  config OF_PRIOR_STAGE
>         bool "Prior stage bootloader DTB for DT control"
> +       depends on ARCH_BCMSTB
>         help
>           If this option is enabled, the device tree used for DT
>           control will be read from a device tree binary, at a memory
> diff --git a/lib/fdtdec.c b/lib/fdtdec.c
> index 7358cb6dd168..8d0db5ac6173 100644
> --- a/lib/fdtdec.c
> +++ b/lib/fdtdec.c
> @@ -1581,6 +1581,10 @@ int fdtdec_setup(void)
>                 return -1;
>         }
>  # elif defined(CONFIG_OF_PRIOR_STAGE)
> +       /*
> +        * obsolete don't use this on newer boards.  Prefer CONFIG_OF_BOARD
> +        * instead
> +        */
>         gd->fdt_blob = (void *)(uintptr_t)prior_stage_fdt_address;
>  # endif
>  # ifndef CONFIG_SPL_BUILD
> --
> 2.33.0
>


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