1 files changed, 45 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-5.10/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch b/target/linux/ramips/patches-5.10/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch
new file mode 100644
index 0000000000..63429f49b0
--- /dev/null
+++ b/target/linux/ramips/patches-5.10/0003-MIPS-Fix-memory-reservation-in-bootmem_init-for-cert.patch
@@ -0,0 +1,45 @@
+From: Tobias Wolf <dev-NTEO@vplace.de>
+Subject: [v2] MIPS: Fix memory reservation in bootmem_init for certain non-usermem setups
+
+Commit 67a3ba25aa95 ("MIPS: Fix incorrect mem=X@Y handling") introduced a new
+issue for rt288x where "PHYS_OFFSET" is 0x0 but the calculated "ramstart" is
+not. As the prerequisite of custom memory map has been removed, this results
+in the full memory range of 0x0 - 0x8000000 to be marked as reserved for this
+platform.
+
+v2: Correctly compare that usermem is not null.
+
+This patch adds the originally intended prerequisite again.
+
+Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
+---
+
+--- a/arch/mips/kernel/setup.c
++++ b/arch/mips/kernel/setup.c
+@@ -287,6 +287,8 @@ static unsigned long __init init_initrd(
+  * Initialize the bootmem allocator. It also setup initrd related data
+  * if needed.
+  */
++static int usermem __initdata;
++
+ #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
+ 
+ static void __init bootmem_init(void)
+@@ -325,7 +327,7 @@ static void __init bootmem_init(void)
+ 	/*
+ 	 * Reserve any memory between the start of RAM and PHYS_OFFSET
+ 	 */
+-	if (ramstart > PHYS_OFFSET)
++	if (usermem && ramstart > PHYS_OFFSET)
+ 		memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
+ 
+ 	if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
+@@ -386,8 +388,6 @@ static void __init bootmem_init(void)
+ 
+ #endif	/* CONFIG_SGI_IP27 */
+ 
+-static int usermem __initdata;
+-
+ static int __init early_parse_mem(char *p)
+ {
+ 	phys_addr_t start, size;