--- zzzz-none-000/linux-3.10.107/arch/c6x/include/asm/pgtable.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/c6x/include/asm/pgtable.h	2021-02-04 17:41:59.000000000 +0000
@@ -50,11 +50,6 @@
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-static inline int pte_file(pte_t pte)
-{
-	return 0;
-}
-
 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 
@@ -71,7 +66,11 @@
  * No page table caches to initialise
  */
 #define pgtable_cache_init()   do { } while (0)
-#define io_remap_pfn_range      remap_pfn_range
+
+/*
+ * c6x is !MMU, so define the simpliest implementation
+ */
+#define pgprot_writecombine pgprot_noncached
 
 #include <asm-generic/pgtable.h>