Re: [PATCH] arm64: dts: renesas: ironhide: Align inline ECC carveout sizes with bootloader settings

[Geert Uytterhoeven]

On Thu, 17 Sept 2026 at 00:08, Marek Vasut
<marek.vasut+renesas@xxxxxxxxxxx> wrote:
> The DBSC5 DRAM controller protects DRAM content using inline ECC. The
> current set of carveouts follows SoC documentation, which describes the
> three trailing carveouts as larger than the rest.
>
> Both the downstream IPL and mainline U-Boot on RSIP configure the ECC
> carveouts to the same size for all eight carveouts. Align the carveout
> sizes with the controller configuration set by the bootloader.
>
> This makes 1638 MiB of DRAM available for each of the three carveouts,
> which adds up to a total of 4915 MiB of newly accessible DRAM on this
> platform with this fix.
>
> Making this memory available does not pose a danger, since the current
> set of carveouts were carefully set to a larger size to prevent any
> possible issues until a confirmation from the hardware team become
> available, that it is safe to apply these less restrictive settings.
>
> Fixes: 6fa6ee724d8d ("arm64: dts: renesas: ironhide: Describe inline ECC carveouts")
> Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxxxx>

>From the review thread on the original:
Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
i.e. will queue in renesas-devel for v7.4.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds