--- /dev/null
+From: Felix Fietkau <nbd@nbd.name>
+Date: Mon Jul 24 13:29:13 CEST 2023
+Subject: [PATCH] mips: ralink: increase highmem start
+
+Increase highmem start address in order to support devices with 512 MB memory
+and MT7621 SoC
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+--- a/arch/mips/include/asm/mach-ralink/spaces.h
++++ b/arch/mips/include/asm/mach-ralink/spaces.h
+@@ -5,6 +5,7 @@
+ #define PCI_IOBASE _AC(0xa0000000, UL)
+ #define PCI_IOSIZE SZ_16M
+ #define IO_SPACE_LIMIT (PCI_IOSIZE - 1)
++#define HIGHMEM_START _AC(0x24000000, UL)
+
+ #include <asm/mach-generic/spaces.h>
+ #endif