linux-kernel - Re: [PATCH] arm64: dts: mt7986: use size of reserved partition for bl2

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Date:   Sun, 28 May 2023 12:41:02 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Frank Wunderlich <linux@...web.de>
Cc:     linux-mediatek@...ts.infradead.org,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: mt7986: use size of reserved partition for
 bl2

On Sun, May 28, 2023 at 01:33:42PM +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> To store uncompressed bl2 more space is required than partition is
> actually defined.
> 
> There is currently no known usage of this reserved partition.
> Openwrt uses same partition layout.
> 
> We added same change to u-boot with commit d7bb1099 [1].
> 
> [1] https://source.denx.de/u-boot/u-boot/-/commit/d7bb109900c1ca754a0198b9afb50e3161ffc21e
> 
> Cc: stable@...r.kernel.org
> Fixes: 8e01fb15b815 ("arm64: dts: mt7986: add Bananapi R3")
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>

Reviewed-by: Daniel Golle <daniel@...rotopia.org>

> ---
> If the bl2 does not fit into the bl2-partition (cut off), board does
> not boot, thats why i want to increase it now. My current bl2 is 197K
> for nor and i ran into this problem.
> 
> Openwrt uses also the first reserved partition to give bl2 more
> space:
> 
> https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/mediatek/dts/mt7986a-bananapi-bpi-r3-nor.dts;h=f597b869abc80d1a73f44ebb85ad4da17376bb52;hb=HEAD#l22
> 
> so imho it should be same in mainline to not require complex bl2
> compression.
> 
> have now sent the board-specific dts to uboot too:
> https://source.denx.de/u-boot/u-boot/-/commit/d7bb109900c1ca754a0198b9afb50e3161ffc21e
> ---
>  .../boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dtso     | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dtso b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dtso
> index 84aa229e80f3..e48881be4ed6 100644
> --- a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dtso
> +++ b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dtso
> @@ -27,15 +27,10 @@ partitions {
>  
>  					partition@0 {
>  						label = "bl2";
> -						reg = <0x0 0x20000>;
> +						reg = <0x0 0x40000>;
>  						read-only;
>  					};
>  
> -					partition@...00 {
> -						label = "reserved";
> -						reg = <0x20000 0x20000>;
> -					};
> -
>  					partition@...00 {
>  						label = "u-boot-env";
>  						reg = <0x40000 0x40000>;
> -- 
> 2.34.1
>