diff options
Diffstat (limited to 'target/linux/patches/6.6.88/armnommu-versatile.patch')
| -rw-r--r-- | target/linux/patches/6.6.88/armnommu-versatile.patch | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/target/linux/patches/6.6.88/armnommu-versatile.patch b/target/linux/patches/6.6.88/armnommu-versatile.patch new file mode 100644 index 000000000..f8f10f50b --- /dev/null +++ b/target/linux/patches/6.6.88/armnommu-versatile.patch @@ -0,0 +1,101 @@ +From 77c038d93769c92ef54cdbb50388564d1b37987b Mon Sep 17 00:00:00 2001 +From: Greg Ungerer <gerg@kernel.org> +Date: Fri, 23 Sep 2016 13:37:34 +1000 +Subject: [PATCH] ARM: versatile: support configuring versatile machine for no-MMU + +Allow the arm versatile machine to be configured for no-MMU operation. + +Older kernels had the ability to build the versatile machine with the MMU +disabled (!CONFIG_MMU). Recent changes to convert the versatile machine +to device tree lost this ability. (Although older kernels could be built +they did not run due to a bug in the IO_ADDRESS() mapping on this machine). + +The motivation for this is that the versatile machine is well supported +in qemu. And this provides an excellent platform for development and +testing no-MMU support on ARM in general. + +This patch adds a versatile platform selection in the upper level arm +system type menu - where it appeared in older kernel versions - when +configuring for the no-MMU case. There is no visible change to the way +versatile is selected for the MMU enabled case. + +Signed-off-by: Greg Ungerer <gerg@kernel.org> +--- + arch/arm/Kconfig | 13 ++++++++++++- + arch/arm/include/asm/mach/map.h | 1 + + arch/arm/mach-versatile/Kconfig | 2 +- + arch/arm/mach-versatile/versatile.c | 4 ++++ + 4 files changed, 18 insertions(+), 2 deletions(-) + +diff --git a/arch/arm/mach-versatile/versatile.c b/arch/arm/mach-versatile/versatile.c +index 02ba68abe533..835b51bc597b 100644 +--- a/arch/arm/mach-versatile/versatile.c ++++ b/arch/arm/mach-versatile/versatile.c +@@ -22,7 +22,11 @@ + #include <asm/mach/map.h> + + /* macro to get at MMIO space when running virtually */ ++#ifdef CONFIG_MMU + #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)) + + /* +diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h +index 2b8970d8e5a2..41844ab6aec5 100644 +--- a/arch/arm/include/asm/mach/map.h ++++ b/arch/arm/include/asm/mach/map.h +@@ -60,6 +60,7 @@ extern int ioremap_page(unsigned long virt, unsigned long phys, + #else + #define iotable_init(map,num) do { } while (0) + #define vm_reserve_area_early(a,s,c) do { } while (0) ++#define debug_ll_io_init() do { } while (0) + #endif + + #endif +diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig +index e24a9820e12f..342e1efa583a 100644 +--- a/arch/arm/Kconfig ++++ b/arch/arm/Kconfig +@@ -307,12 +307,23 @@ config MMU + Select if you want MMU-based virtualised addressing space + support by paged memory management. If unsure, say 'Y'. + ++choice ++ prompt "ARM system type" ++ depends on !MMU ++ default ARM_SINGLE_ARMV7M ++ + config ARM_SINGLE_ARMV7M +- def_bool !MMU ++ bool "ARMv7-M based platforms (Cortex-M0/M3/M4)" + select ARM_NVIC + select CPU_V7M + select NO_IOPORT_MAP + ++config ARM_SINGLE_ARM926 ++ bool "ARM926 based platforms" ++ select CPU_ARM926T ++ ++endchoice ++ + config ARCH_MMAP_RND_BITS_MIN + default 8 + +diff --git a/arch/arm/mach-versatile/Kconfig b/arch/arm/mach-versatile/Kconfig +index b1519b4dc03a..2f1bf95daeb0 100644 +--- a/arch/arm/mach-versatile/Kconfig ++++ b/arch/arm/mach-versatile/Kconfig +@@ -1,7 +1,7 @@ + # SPDX-License-Identifier: GPL-2.0 + config ARCH_VERSATILE + bool "ARM Ltd. Versatile family" +- depends on ARCH_MULTI_V5 ++ depends on ARCH_MULTI_V5 || ARM_SINGLE_ARM926 + depends on CPU_LITTLE_ENDIAN + select ARM_AMBA + select ARM_TIMER_SP804 +-- +2.25.1 |