arm: qemu versatile emulation without MMU, update kernel

1 files changed, 101 insertions, 0 deletions

diff --git a/target/linux/patches/6.1.44/armnommu-versatile.patch b/target/linux/patches/6.1.44/armnommu-versatile.patch
new file mode 100644
index 000000000..f8f10f50b
--- /dev/null
+++ b/target/linux/patches/6.1.44/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