diff options
Diffstat (limited to 'board/qemu/arm-versatile/patches/linux')
| -rw-r--r-- | board/qemu/arm-versatile/patches/linux/versatile-nommu.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/board/qemu/arm-versatile/patches/linux/versatile-nommu.patch b/board/qemu/arm-versatile/patches/linux/versatile-nommu.patch new file mode 100644 index 0000000000..961b6c3dd1 --- /dev/null +++ b/board/qemu/arm-versatile/patches/linux/versatile-nommu.patch @@ -0,0 +1,30 @@ +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)) + |
