--- zzzz-none-000/linux-4.9.276/arch/mips/mm/ioremap.c	2021-07-20 14:21:16.000000000 +0000
+++ falcon-5530-750/linux-4.9.276/arch/mips/mm/ioremap.c	2023-04-05 08:19:00.000000000 +0000
@@ -142,6 +142,7 @@
 	if (!size || last_addr < phys_addr)
 		return NULL;
 
+#ifndef CONFIG_SOC_GRX500
 	/*
 	 * Map uncached objects in the low 512mb of address space using KSEG1,
 	 * otherwise map using page tables.
@@ -149,6 +150,7 @@
 	if (IS_LOW512(phys_addr) && IS_LOW512(last_addr) &&
 	    flags == _CACHE_UNCACHED)
 		return (void __iomem *) CKSEG1ADDR(phys_addr);
+#endif
 
 	/*
 	 * Don't allow anybody to remap RAM that may be allocated by the page
@@ -191,8 +193,10 @@
 {
 	struct vm_struct *p;
 
+#ifndef CONFIG_SOC_GRX500
 	if (IS_KSEG1(addr))
 		return;
+#endif
 
 	p = remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr));
 	if (!p)