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Wed, 21 Feb 2024 00:26:35 -0800 (PST) Received: from [192.168.1.20] ([178.197.222.116]) by smtp.gmail.com with ESMTPSA id fe12-20020a056402390c00b00564fa936b2bsm337395edb.94.2024.02.21.00.26.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Feb 2024 00:26:34 -0800 (PST) Message-ID: <5d67441e-df61-4894-ba52-2bed8a1143d6@linaro.org> Date: Wed, 21 Feb 2024 09:26:33 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] ARM: dts: exynos4212-tab3: limit usable memory range Content-Language: en-US To: Artur Weber , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alim Akhtar Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht References: <20240217-tab3-limit-usable-memory-range-v1-1-49cc9c86a5cc@gmail.com> <15ab6aa6-fb30-4970-9c50-546afb933e03@linaro.org> From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 19/02/2024 20:49, Artur Weber wrote: > On 19.02.2024 08:44, Krzysztof Kozlowski wrote: >> On 17/02/2024 20:02, Artur Weber wrote: >>> The stock bootloader on the Samsung Galaxy Tab 3 8.0 provides an >>> incorrect available memory range over ATAG_MEM. Limit the usable >>> memory in the DTS to prevent it from doing so, without having to >>> disable ATAG support. >>> >>> Signed-off-by: Artur Weber >>> --- >>> arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi | 6 ++++++ >>> 1 file changed, 6 insertions(+) >>> >>> diff --git a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi >>> index e5254e32aa8f..9bc05961577d 100644 >>> --- a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi >>> +++ b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi >>> @@ -45,6 +45,12 @@ chosen { >>> /* Default S-BOOT bootloader loads initramfs here */ >>> linux,initrd-start = <0x42000000>; >>> linux,initrd-end = <0x42800000>; >>> + >>> + /* >>> + * Stock bootloader provides incorrect memory size in ATAG_MEM; >>> + * override it here >>> + */ >>> + linux,usable-memory-range = <0x40000000 0x3fc00000>; >> >> Applied and dropped: >> chosen: linux,usable-memory-range:0: [4611686019496935424] is too short > > This seems to be a binding issue; the DT schema expects a 64-bit memory > address and size, and doesn't allow a 32-bit range. I've tested the DTS > on my device and this property seems to be handled fine, so I think this > should allow 32-bit values as well. Regardless where is the issue: please test before sending. > > I've opened a PR[1] against devicetree-org/dt-schema (where the schema > for the chosen node is stored) to try and fix this. If my approach is > incorrect, feel free to comment there as well. According to Rob's comments, the DTS is the issue. Best regards, Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel