2024-01-30 20:41:40

by Henrik Grimler

Subject: [PATCH 3/3] ARM: dts: samsung: exynos5420-galaxy-tab-common: decrease available memory

The last 6 MiB are used by trustzone firmware, and cannot be used by
Linux. Currently we are saved by that the proprietary bootloader
(sboot) passes available memory to kernel through ATAG_MEM. Change
memory range in any case so that we do not have to rely on ATAG_MEM.

Signed-off-by: Henrik Grimler <[email protected]>

---

Similar fix was applied for the exynos5422 odroids in commit
6591a02e17e6 ("ARM: dts: reduce total RAM by 22 MiB for
exynos5422-odroidxu3"):
https://lore.kernel.org/all/[email protected]/
---
arch/arm/boot/dts/samsung/exynos5420-galaxy-tab-common.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/samsung/exynos5420-galaxy-tab-common.dtsi b/arch/arm/boot/dts/samsung/exynos5420-galaxy-tab-common.dtsi
index d569fac29b18..ac929e282c84 100644
--- a/arch/arm/boot/dts/samsung/exynos5420-galaxy-tab-common.dtsi
+++ b/arch/arm/boot/dts/samsung/exynos5420-galaxy-tab-common.dtsi
@@ -40,7 +40,7 @@ chosen {

memory@20000000 {
device_type = "memory";
- reg = <0x20000000 0xc0000000>;
+ reg = <0x20000000 0xbfa00000>;
};

firmware@2073000 {

--
2.30.2

2024-02-06 10:22:13

by Krzysztof Kozlowski

Subject: Re: (subset) [PATCH 3/3] ARM: dts: samsung: exynos5420-galaxy-tab-common: decrease available memory

On Tue, 30 Jan 2024 21:40:41 +0100, Henrik Grimler wrote:
> The last 6 MiB are used by trustzone firmware, and cannot be used by
> Linux. Currently we are saved by that the proprietary bootloader
> (sboot) passes available memory to kernel through ATAG_MEM. Change
> memory range in any case so that we do not have to rely on ATAG_MEM.
>
>

Applied, thanks!

[3/3] ARM: dts: samsung: exynos5420-galaxy-tab-common: decrease available memory
https://git.kernel.org/krzk/linux/c/9a5dbb835fd396c78da34b26ee91db6d529d096d

Best regards,
--
Krzysztof Kozlowski <[email protected]>