linux-kernel - Re: [PATCH] ARM: dts: exynos4212-tab3: limit usable memory range

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Date: Wed, 21 Feb 2024 09:26:33 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Artur Weber <aweber.kernel@...il.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
 ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH] ARM: dts: exynos4212-tab3: limit usable memory range

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 <aweber.kernel@...il.com>
>>> ---
>>>   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