[openwrt/openwrt] mpc85xx: copy missing patch from 5.15 to 6.1

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/7dbe27e3f7f6732a72ca823857317b1789881c59

commit 7dbe27e3f7f6732a72ca823857317b1789881c59
Author: Pawel Dembicki <paweldembicki at gmail.com>
AuthorDate: Wed Mar 13 13:13:51 2024 +0100

    mpc85xx: copy missing patch from 5.15 to 6.1
    
    patch 150-arch-powerpc-simpleboot-prevent-overwrite-of-CPU1-sp.patch
    was missed durring copy from 5.15 to 6.1.
    
    This patch restore it.
    
    Signed-off-by: Pawel Dembicki <paweldembicki at gmail.com>
---
 ...c-simpleboot-prevent-overwrite-of-CPU1-sp.patch | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/target/linux/mpc85xx/patches-6.1/150-arch-powerpc-simpleboot-prevent-overwrite-of-CPU1-sp.patch b/target/linux/mpc85xx/patches-6.1/150-arch-powerpc-simpleboot-prevent-overwrite-of-CPU1-sp.patch
new file mode 100644
index 0000000000..1ff80a5016
--- /dev/null
+++ b/target/linux/mpc85xx/patches-6.1/150-arch-powerpc-simpleboot-prevent-overwrite-of-CPU1-sp.patch
@@ -0,0 +1,41 @@
+From 5f856ccc34df25060d36a5a81b7b45b574d86e35 Mon Sep 17 00:00:00 2001
+From: David Bauer <mail at david-bauer.net>
+Date: Sun, 3 Dec 2023 20:09:24 +0100
+Subject: [PATCH] arch: powerpc: simpleboot: prevent overwrite of CPU1
+ spin-table
+
+Don't overwrite the spin-table of additional CPU cores with loader-heap.
+
+U-Boot places the spin-table for CPU1 on P1020 SoCs in the top 1MB of
+system-memory. Instead of parsing reserved-memory (which would be
+considerable more work), reduce the available system-memory for the
+loader by 1MB.
+
+This prevents the loader from overwriting the spin-table of
+additional CPU cores on these platforms.
+
+Linux itself needs to be made aware by this using reserved-memory
+definitions.
+
+This patch is required for using CPU1 on the Extreme Networks
+WS-AP3825i.
+
+Signed-off-by: David Bauer <mail at david-bauer.net>
+---
+ arch/powerpc/boot/simpleboot.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/arch/powerpc/boot/simpleboot.c
++++ b/arch/powerpc/boot/simpleboot.c
+@@ -65,6 +65,11 @@ void platform_init(unsigned long r3, uns
+ 	if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL)
+ 		memsize64 = 0xffffffff;
+ 
++	/* Reserve upper 1 MB of memory for CPU1 spin-table */
++	if (memsize64 > 0x100000) {
++		memsize64 = memsize64 - 0x100000;
++	}
++
+ 	/* finally, setup the timebase */
+ 	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
+ 					     "cpu", sizeof("cpu"));