board/qemu/arm-versatile/patches/linux/versatile-nommu.patch

   1 From b7c1666813424d329868335c8faf8886b0f85b6c Mon Sep 17 00:00:00 2001
   2 From: Greg Ungerer <gerg@linux-m68k.org>
   3 Date: Thu, 11 Aug 2016 21:33:11 +1000
   4 Subject: [PATCH] arm: fix versatile platform to work in no-MMU mode
   5
   6 If CONFIG_MMU is disabled then do not carry out the virtual memory address
   7 translation for IO devices.
   8
   9 With this fix in place we can run the ARM Versatile board (including its
  10 qemu emulation) as a no-MMU Linux system.
  11
  12 Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
  13 Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
  14
  15 diff -Nur linux-4.4.17.orig/arch/arm/mach-versatile/include/mach/hardware.h linux-4.4.17/arch/arm/mach-versatile/include/mach/hardware.h
  16 --- linux-4.4.17.orig/arch/arm/mach-versatile/include/mach/hardware.h   2016-08-10 11:49:43.000000000 +0200
  17 +++ linux-4.4.17/arch/arm/mach-versatile/include/mach/hardware.h        2016-08-25 23:19:03.691716292 +0200
  18 @@ -30,8 +30,12 @@
  19  #define VERSATILE_PCI_VIRT_BASE                (void __iomem *)0xe8000000ul
  20  #define VERSATILE_PCI_CFG_VIRT_BASE    (void __iomem *)0xe9000000ul
  21
  22 +#ifdef CONFIG_MMU
  23  /* macro to get at MMIO space when running virtually */
  24  #define IO_ADDRESS(x)          (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000)
  25 +#else
  26 +#define IO_ADDRESS(x)          (x)
  27 +#endif
  28
  29  #define __io_address(n)                ((void __iomem __force *)IO_ADDRESS(n))
  30