| Message ID | 20240217-tab3-limit-usable-memory-range-v1-1-49cc9c86a5cc@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | ARM: dts: exynos4212-tab3: limit usable memory range | expand |
Hi Artur, On Sat, Feb 17, 2024 at 08:02:47PM +0100, 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@gmail.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>; Maybe it would make sense to set the memory reg to <0x40000000 0x60000000> (1.5 GiB) and move the comment about last 512(/516) MiB being weird/broken here instead. It looks a bit weird that the memory range and usable-memory-range are identical, and device tree should describe hardware, which technically has 1.5 GiB RAM.
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@gmail.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 Does not look you tested the bindings. Please observe that we have dedicated subsystem profile since a release: https://www.kernel.org/doc/html/latest/process/maintainers.html#arm-samsung-s3c-s5p-and-exynos-arm-architectures Best regards, Krzysztof
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@gmail.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. 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. Best regards Artur [1] https://github.com/devicetree-org/dt-schema/pull/128 > > Does not look you tested the bindings. > > Please observe that we have dedicated subsystem profile since a release: > https://www.kernel.org/doc/html/latest/process/maintainers.html#arm-samsung-s3c-s5p-and-exynos-arm-architectures > > Best regards, > Krzysztof >
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@gmail.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
On 21/02/2024 09:26, Krzysztof Kozlowski wrote: > 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@gmail.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. With updated dtschema I still see the same warning. Is something else missing? Best regards, Krzysztof
On 22.02.2024 16:55, Krzysztof Kozlowski wrote: > On 21/02/2024 09:26, Krzysztof Kozlowski wrote: >> 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@gmail.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. > > With updated dtschema I still see the same warning. Is something else > missing? My bad, turns out I didn't test my dt-schemas patch correctly... looks like this has been *properly* fixed now in latest dt-schema[1][2], and I no longer get warnings about the linux,usable-memory-range property. (There are some new warnings though, for some nodes in exynos4.dtsi that have 2 reg values, but that's out of scope for this patch.) Sorry for the general confusion, I'll make sure to double-check my patches next time... Best regards Artur [1] https://github.com/devicetree-org/dt-schema/commit/08eff8e6167e9e0bc1694af6c298b4584105a057 [2] https://github.com/devicetree-org/dt-schema/commit/c95c9ad63c51f8d9cfb258e6f17a8001efab6d64
On Sat, 17 Feb 2024 20:02:47 +0100, 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. > > Applied, thanks! [1/1] ARM: dts: exynos4212-tab3: limit usable memory range https://git.kernel.org/krzk/linux/c/7bff1d35c1294c011b0269b8eaeb8f930df386fe Best regards,
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>; }; firmware@204f000 {
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@gmail.com> --- arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi | 6 ++++++ 1 file changed, 6 insertions(+) --- base-commit: 0f1dd5e91e2ba3990143645faff2bcce2d99778e change-id: 20240217-tab3-limit-usable-memory-range-1d1ffa8dc44d Best regards,