[PATCH] lmb: Rename LMB_LIMIT_DMA_BELOW_4G to LMB_LIMIT_DMA_BELOW_RAM_TOP

[Ilias Apalodimas]

Thanks for following up Marek

On Thu, 4 Jun 2026 at 20:33, Marek Vasut
<marek.vasut+renesas at mailbox.org> wrote:
>
> Rename LMB_LIMIT_DMA_BELOW_4G to LMB_LIMIT_DMA_BELOW_RAM_TOP
> to make the Kconfig option more descriptive. No functional
> change.
>
> Suggested-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
> ---

Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>

> Cc: Andrew Goodbody <andrew.goodbody at linaro.org>
> Cc: David Lechner <dlechner at baylibre.com>
> Cc: Heiko Schocher <hs at nabladev.com>
> Cc: Heinrich Schuchardt <xypron.glpk at gmx.de>
> Cc: Holger Brunck <holger.brunck at hitachienergy.com>
> Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> Cc: Peter Robinson <pbrobinson at gmail.com>
> Cc: Quentin Schulz <quentin.schulz at cherry.de>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Sughosh Ganu <sughosh.ganu at arm.com>
> Cc: Tom Rini <trini at konsulko.com>
> Cc: u-boot at lists.denx.de
> ---
>  lib/Kconfig | 7 ++++---
>  lib/lmb.c   | 2 +-
>  2 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 29911068a69..cf13ac1bdad 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -1295,13 +1295,14 @@ config SPL_LMB_ARCH_MEM_MAP
>           memory map. Enable this config in such scenarios which allow
>           architectures and boards to define their own memory map.
>
> -config LMB_LIMIT_DMA_BELOW_4G
> +config LMB_LIMIT_DMA_BELOW_RAM_TOP
>         bool
>         depends on LMB
>         default y if ARCH_BCM283X
>         help
> -         Some architectures can not DMA above 4 GiB boundary,
> -         limit available memory to memory below 4 GiB boundary.
> +         Some architectures can not DMA above ram_top boundary,
> +         which is after 4 GiB or 32-bit boundary too. Limit the
> +         available memory to memory below ram_top boundary.
>
>  config PHANDLE_CHECK_SEQ
>         bool "Enable phandle check while getting sequence number"
> diff --git a/lib/lmb.c b/lib/lmb.c
> index a2aeb526e29..275d105c5aa 100644
> --- a/lib/lmb.c
> +++ b/lib/lmb.c
> @@ -628,7 +628,7 @@ static void lmb_add_memory(void)
>
>                 if (size) {
>                         lmb_add(bd->bi_dram[i].start, size);
> -                       if (!IS_ENABLED(CONFIG_LMB_LIMIT_DMA_BELOW_4G))
> +                       if (!IS_ENABLED(CONFIG_LMB_LIMIT_DMA_BELOW_RAM_TOP))
>                                 continue;
>
>                         bank_end = bd->bi_dram[i].start + size;
> --
> 2.53.0
>