Index: linux-2.6.23/arch/mips/mm/init.c =================================================================== --- linux-2.6.23.orig/arch/mips/mm/init.c 2007-10-09 22:31:38.000000000 +0200 +++ linux-2.6.23/arch/mips/mm/init.c 2007-10-13 02:57:18.483434538 +0200 @@ -211,7 +211,7 @@ void *vfrom, *vto; vto = kmap_atomic(to, KM_USER1); - if (cpu_has_dc_aliases && !Page_dcache_dirty(from)) { + if (cpu_has_dc_aliases && cpu_use_kmap_coherent && !Page_dcache_dirty(from)) { vfrom = kmap_coherent(from, vaddr); copy_page(vto, vfrom); kunmap_coherent(); @@ -234,7 +234,7 @@ struct page *page, unsigned long vaddr, void *dst, const void *src, unsigned long len) { - if (cpu_has_dc_aliases) { + if (cpu_has_dc_aliases && cpu_use_kmap_coherent) { void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); memcpy(vto, src, len); kunmap_coherent(); @@ -250,7 +250,7 @@ struct page *page, unsigned long vaddr, void *dst, const void *src, unsigned long len) { - if (cpu_has_dc_aliases) { + if (cpu_has_dc_aliases && cpu_use_kmap_coherent) { void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); memcpy(dst, vfrom, len); Index: linux-2.6.23/include/asm-mips/mach-bcm947xx/cpu-feature-overrides.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/include/asm-mips/mach-bcm947xx/cpu-feature-overrides.h 2007-10-13 02:56:22.020216880 +0200 @@ -0,0 +1,13 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org) + */ +#ifndef __ASM_MACH_BCM947XX_CPU_FEATURE_OVERRIDES_H +#define __ASM_MACH_BCM947XX_CPU_FEATURE_OVERRIDES_H + +#define cpu_use_kmap_coherent 0 + +#endif /* __ASM_MACH_BCM947XX_CPU_FEATURE_OVERRIDES_H */ Index: linux-2.6.23/include/asm-mips/cpu-features.h =================================================================== --- linux-2.6.23.orig/include/asm-mips/cpu-features.h 2007-10-09 22:31:38.000000000 +0200 +++ linux-2.6.23/include/asm-mips/cpu-features.h 2007-10-13 02:56:22.028217337 +0200 @@ -101,6 +101,9 @@ #ifndef cpu_has_pindexed_dcache #define cpu_has_pindexed_dcache (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX) #endif +#ifndef cpu_use_kmap_coherent +#define cpu_use_kmap_coherent 1 +#endif /* * I-Cache snoops remote store. This only matters on SMP. Some multiprocessors