community/linux-postmarketos-exynos4: Add patch needed for booting samsung-lt01

This one has stalled a bit due to some upstream shenanigans,
but is now confirmed to be fine; since it hasn't been merged
yet, add it here manually.

device/community/linux-postmarketos-exynos4/APKBUILD

@@ -4,7 +4,7 @@
 
 pkgname=linux-postmarketos-exynos4
 pkgver=6.7.6
-pkgrel=1
+pkgrel=2
 pkgdesc="Mainline kernel fork for Samsung Exynos4 devices"
 arch="armv7"
 _carch="arm"
@@ -42,6 +42,7 @@ source="
 	$_config
 	initramfs.list
 	init
+	tab3-limit-memory.patch
 "
 builddir="$srcdir/linux-$_tag"
 
@@ -83,4 +84,5 @@ sha512sums="
 ee4cec8100ebe1d85bd18ba0ba5bdf9746f1fb7a7cb6dff0d8f6782d03f51e5d87f0d05a388ff641c276db7857e729ceb900bf33061d079e97cf6e7b43dd5027  config-postmarketos-exynos4.armv7
 aaff0332b90e1f9f62de1128cace934717336e54ab09de46477369fa808302482d97334e43a85ee8597c1bcab64d3484750103559fea2ce8cd51776156bf7591  initramfs.list
 09f1f214a24300696809727a7b04378887c06ca6f40803ca51a12bf2176a360b2eb8632139d6a0722094e05cb2038bdb04018a1e3d33fc2697674552ade03bee  init
+aea665e80dee318ec3be23d3f28b88e87eb551d2756e14d896781a0861a4387920f6969990eb171e8c7d6f86c36cef63a89337d63bfee7e44b9de7a8efb36c73  tab3-limit-memory.patch
 "

device/community/linux-postmarketos-exynos4/tab3-limit-memory.patch

+From 57ae04aa40be1e83e2da2fdf92de749f694ea5f8 Mon Sep 17 00:00:00 2001
+From: Artur Weber <aweber.kernel@gmail.com>
+Date: Sat, 17 Feb 2024 12:34:46 +0100
+Link: https://gitlab.com/exynos4-mainline/linux/-/merge_requests/13
+Subject: [PATCH] ARM: dts: exynos4212-tab3: Limit usable memory range
+
+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 87a1317f9220..996cd5cb0c07 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>;
++
++		/*
++		 * S-BOOT provides incorrect memory size in bootloader;
++		 * override it here
++		 */
++		linux,usable-memory-range = <0x40000000 0x3fc00000>;
+ 	};
+ 
+ 	firmware@204f000 {
+-- 
+2.44.0
+