nds32: Remove the architecture

The nds32 architecture, also known as AndeStar V3, is a custom 32-bit
RISC target designed by Andes Technologies. Support was added to the
kernel in 2016 as the replacement RISC-V based V5 processors were
already announced, and maintained by (current or former) Andes
employees.

As explained by Alan Kao, new customers are now all using RISC-V,
and all known nds32 users are already on longterm stable kernels
provided by Andes, with no development work going into mainline
support any more.

While the port is still in a reasonably good shape, it only gets
worse over time without active maintainers, so it seems best
to remove it before it becomes unusable. As always, if it turns
out that there are mainline users after all, and they volunteer
to maintain the port in the future, the removal can be reverted.

Link: https://lore.kernel.org/linux-mm/YhdWNLUhk+x9RAzU@yamatobi.andestech.com/
Link: https://lore.kernel.org/lkml/20220302065213.82702-1-alankao@andestech.com/
Link: https://www.andestech.com/en/products-solutions/andestar-architecture/
Signed-off-by: Alan Kao <alankao@andestech.com>
[arnd: rewrite changelog to provide more background]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 101 deletions

diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
deleted file mode 100644
index 013249430fa3..000000000000
--- a/arch/nds32/Kconfig
+++ /dev/null
@@ -1,101 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# For a description of the syntax of this configuration file,
-# see Documentation/kbuild/kconfig-language.rst.
-#
-
-config NDS32
-	def_bool y
-	select ARCH_32BIT_OFF_T
-	select ARCH_HAS_DMA_PREP_COHERENT
-	select ARCH_HAS_SYNC_DMA_FOR_CPU
-	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
-	select ARCH_WANT_FRAME_POINTERS if FTRACE
-	select CLKSRC_MMIO
-	select CLONE_BACKWARDS
-	select COMMON_CLK
-	select DMA_DIRECT_REMAP
-	select GENERIC_ATOMIC64
-	select GENERIC_CPU_DEVICES
-	select GENERIC_IRQ_CHIP
-	select GENERIC_IRQ_SHOW
-	select GENERIC_IOREMAP
-	select GENERIC_LIB_ASHLDI3
-	select GENERIC_LIB_ASHRDI3
-	select GENERIC_LIB_CMPDI2
-	select GENERIC_LIB_LSHRDI3
-	select GENERIC_LIB_MULDI3
-	select GENERIC_LIB_UCMPDI2
-	select GENERIC_TIME_VSYSCALL
-	select HAVE_ARCH_TRACEHOOK
-	select HAVE_DEBUG_KMEMLEAK
-	select HAVE_EXIT_THREAD
-	select HAVE_REGS_AND_STACK_ACCESS_API
-	select HAVE_PERF_EVENTS
-	select IRQ_DOMAIN
-	select LOCKDEP_SUPPORT
-	select MODULES_USE_ELF_RELA
-	select OF
-	select OF_EARLY_FLATTREE
-	select NO_IOPORT_MAP
-	select RTC_LIB
-	select THREAD_INFO_IN_TASK
-	select HAVE_FUNCTION_TRACER
-	select HAVE_FUNCTION_GRAPH_TRACER
-	select HAVE_FTRACE_MCOUNT_RECORD
-	select HAVE_DYNAMIC_FTRACE
-	select TRACE_IRQFLAGS_SUPPORT
-	help
-	  Andes(nds32) Linux support.
-
-config GENERIC_CALIBRATE_DELAY
-	def_bool y
-
-config GENERIC_CSUM
-	def_bool y
-
-config GENERIC_HWEIGHT
-	def_bool y
-
-config GENERIC_LOCKBREAK
-	def_bool y
-	depends on PREEMPTION
-
-config STACKTRACE_SUPPORT
-	def_bool y
-
-config FIX_EARLYCON_MEM
-	def_bool y
-
-config PGTABLE_LEVELS
-	default 2
-
-menu "System Type"
-source "arch/nds32/Kconfig.cpu"
-config NR_CPUS
-	int
-	default 1
-
-config MMU
-	def_bool y
-
-config NDS32_BUILTIN_DTB
-	string "Builtin DTB"
-	default ""
-	help
-	  User can use it to specify the dts of the SoC
-endmenu
-
-menu "Kernel Features"
-source "kernel/Kconfig.hz"
-endmenu
-
-menu "Power management options"
-config SYS_SUPPORTS_APM_EMULATION
-	bool
-
-config ARCH_SUSPEND_POSSIBLE
-	def_bool y
-
-source "kernel/power/Kconfig"
-endmenu