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