[PATCH] xilinx: board: Add support to pick bootscr address from DT

[Simon Glass]

Hi Michal,

On Tue, 13 Jun 2023 at 15:13, Michal Simek <michal.simek at amd.com> wrote:
>
> From: Algapally Santosh Sagar <santoshsagar.algapally at amd.com>
>
> The bootscript is expected at a default address specific to each
> platform.

Who puts it there?

> When high speed memory like Programmable Logic Double Data Rate RAM
> (PL DDR RAM) or Higher Bandwidth Memory RAM (HBM) is used the boot.scr
> may be loaded at a different offset. The offset needs to be set through
> setenv. Due to the default values in some cases the boot.scr is falling
> in between the kernel partition.
>
> The bootscript address or the bootscript offset is fetched directly from
> the DT and updated in the environment making it easier for automated
> flows.
>
> Signed-off-by: Algapally Santosh Sagar <santoshsagar.algapally at amd.com>
> Signed-off-by: Michal Simek <michal.simek at amd.com>
> ---
>
>  board/xilinx/common/board.c | 43 ++++++++++++++++++++++++++++++++++---
>  1 file changed, 40 insertions(+), 3 deletions(-)
>
> diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c
> index d071ebfb9cc2..bdd4113b0916 100644
> --- a/board/xilinx/common/board.c
> +++ b/board/xilinx/common/board.c
> @@ -405,6 +405,31 @@ static int env_set_by_index(const char *name, int index, char *data)
>         return env_set(var, data);
>  }
>
> +static int get_bootscript_address(u64 *bootscr_address, u64 *bootscr_offset)
> +{
> +       int ret;
> +       ofnode uboot;
> +
> +       *bootscr_address = 0;
> +       *bootscr_offset = 0;
> +
> +       uboot = ofnode_path("/options/u-boot");
> +       if (!ofnode_valid(uboot)) {
> +               printf("%s: Missing /u-boot node\n", __func__);
> +               return -EINVAL;
> +       }
> +
> +       ret = ofnode_read_u64(uboot, "bootscr-address", bootscr_address);

Normally we would have the size under the control of a #address-cells
property. Do you think we should do that here?

> +       if (ret) {
> +               ret = ofnode_read_u64(uboot, "bootscr-offset-from-ram-start",
> +                                     bootscr_offset);
> +               if (ret)
> +                       return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
>  int board_late_init_xilinx(void)
>  {
>         u32 ret = 0;
> @@ -414,9 +439,21 @@ int board_late_init_xilinx(void)
>
>         if (!IS_ENABLED(CONFIG_MICROBLAZE)) {
>                 ulong scriptaddr;
> -
> -               scriptaddr = env_get_hex("scriptaddr", 0);
> -               ret |= env_set_hex("scriptaddr", gd->ram_base + scriptaddr);
> +               u64 bootscr_address;
> +               u64 bootscr_offset;
> +
> +               /* Fetch bootscr_address/bootscr_offset from DT and update */
> +               if (!get_bootscript_address(&bootscr_address, &bootscr_offset)) {
> +                       if (bootscr_offset)
> +                               ret |= env_set_hex("scriptaddr",
> +                                                  gd->ram_base + bootscr_offset);
> +                       else
> +                               ret |= env_set_hex("scriptaddr", bootscr_address);
> +               } else {
> +                       /* Update scriptaddr(bootscr offset) from env */
> +                       scriptaddr = env_get_hex("scriptaddr", 0);
> +                       ret |= env_set_hex("scriptaddr", gd->ram_base + scriptaddr);
> +               }
>         }
>
>         if (IS_ENABLED(CONFIG_ARCH_ZYNQ) || IS_ENABLED(CONFIG_MICROBLAZE))
> --
> 2.36.1
>

Regards,
Simon