arch: nios2: remove arch

Remove architecture and dependencies.
Remove altera HAL supporting nios2

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

.ruff-excludes.toml

@@ -1685,7 +1685,6 @@ exclude = [
     "./scripts/west_commands/runners/mdb.py",
     "./scripts/west_commands/runners/misc.py",
     "./scripts/west_commands/runners/native.py",
-    "./scripts/west_commands/runners/nios2.py",
     "./scripts/west_commands/runners/nrf_common.py",
     "./scripts/west_commands/runners/nrfjprog.py",
     "./scripts/west_commands/runners/nrfutil.py",

MAINTAINERS.yml

@@ -3157,16 +3157,6 @@ Networking:
   tests:
     - net.http
 
-NIOS-2 arch:
-  status: maintained
-  maintainers:
-    - nashif
-  files:
-    - arch/nios2/
-    - include/zephyr/arch/nios2/
-  labels:
-    - "area: NIOS2"
-
 nRF BSIM:
   status: maintained
   maintainers:
@@ -4944,15 +4934,6 @@ West:
   labels:
     - "platform: ADI"
 
-"West project: hal_altera":
-  status: odd fixes
-  collaborators:
-    - nashif
-  files:
-    - modules/Kconfig.altera
-  labels:
-    - "platform: Altera"
-
 "West project: hal_ambiq":
   status: odd fixes
   collaborators:

arch/Kconfig

@@ -104,15 +104,6 @@ config X86
 	help
 	  x86 architecture
 
-config NIOS2
-	bool
-	select ARCH_IS_SET
-	select ATOMIC_OPERATIONS_C
-	imply XIP
-	select ARCH_HAS_TIMING_FUNCTIONS
-	help
-	  Nios II Gen 2 architecture
-
 config RISCV
 	bool
 	select ARCH_IS_SET
@@ -237,7 +228,7 @@ config SRAM_BASE_ADDRESS
 	  /chosen/zephyr,sram in devicetree. The user should generally avoid
 	  changing it via menuconfig or in configuration files.
 
-if ARC || ARM || ARM64 || NIOS2 || X86 || RISCV || RX
+if ARC || ARM || ARM64 || X86 || RISCV || RX
 
 # Workaround for not being able to have commas in macro arguments
 DT_CHOSEN_Z_FLASH := zephyr,flash
@@ -260,7 +251,7 @@ config FLASH_BASE_ADDRESS
 	  normally set by the board's defconfig file and the user should generally
 	  avoid modifying it via the menu configuration.
 
-endif # ARM || ARM64 || ARC || NIOS2 || X86 || RISCV || RX
+endif # ARM || ARM64 || ARC || X86 || RISCV || RX
 
 if ARCH_HAS_TRUSTED_EXECUTION
 

arch/archs.yml

@@ -7,8 +7,6 @@ archs:
     path: arm64
   - name: mips
     path: mips
-  - name: nios2
-    path: nios2
   - name: posix
     path: posix
   - name: riscv