Kconfig.platform

  1# SPDX-License-Identifier: GPL-2.0-only
  2menu "Platform options"
  3
  4comment "Memory settings"
  5
  6config NIOS2_MEM_BASE
  7	hex "Memory base address"
  8	default "0x00000000"
  9	help
 10	  This is the physical address of the memory that the kernel will run
 11	  from. This address is used to link the kernel and setup initial memory
 12	  management. You should take the raw memory address without any MMU
 13	  or cache bits set.
 14	  Please not that this address is used directly so you have to manually
 15	  do address translation if it's connected to a bridge.
 16
 17comment "Device tree"
 18
 19config NIOS2_DTB_AT_PHYS_ADDR
 20	bool "DTB at physical address"
 21	help
 22	  When enabled you can select a physical address to load the dtb from.
 23	  Normally this address is passed by a bootloader such as u-boot but
 24	  using this you can use a devicetree without a bootloader.
 25	  This way you can store a devicetree in NOR flash or an onchip rom.
 26	  Please note that this address is used directly so you have to manually
 27	  do address translation if it's connected to a bridge. Also take into
 28	  account that when using an MMU you'd have to ad 0xC0000000 to your
 29	  address
 30
 31config NIOS2_DTB_PHYS_ADDR
 32	hex "DTB Address"
 33	depends on NIOS2_DTB_AT_PHYS_ADDR
 34	default "0xC0000000"
 35	help
 36	  Physical address of a dtb blob.
 37
 38config BUILTIN_DTB
 39	bool "Compile and link device tree into kernel image"
 40	depends on !COMPILE_TEST
 41	select GENERIC_BUILTIN_DTB
 42	help
 43	  This allows you to specify a dts (device tree source) file
 44	  which will be compiled and linked into the kernel image.
 45
 46config BUILTIN_DTB_NAME
 47	string "Built-in device tree name"
 48	depends on BUILTIN_DTB
 49	default ""
 50	help
 51	  Relative path to the device tree without suffix describing your
 52	  system.
 53
 54comment "Nios II instructions"
 55
 56config NIOS2_ARCH_REVISION
 57	int "Select Nios II architecture revision"
 58	range 1 2
 59	default 1
 60	help
 61	  Select between Nios II R1 and Nios II R2 . The architectures
 62	  are binary incompatible. Default is R1 .
 63
 64config NIOS2_HW_MUL_SUPPORT
 65	bool "Enable MUL instruction"
 66	help
 67	  Set to true if you configured the Nios II to include the MUL
 68	  instruction.  This will enable the -mhw-mul compiler flag.
 69
 70config NIOS2_HW_MULX_SUPPORT
 71	bool "Enable MULX instruction"
 72	help
 73	  Set to true if you configured the Nios II to include the MULX
 74	  instruction.  Enables the -mhw-mulx compiler flag.
 75
 76config NIOS2_HW_DIV_SUPPORT
 77	bool "Enable DIV instruction"
 78	help
 79	  Set to true if you configured the Nios II to include the DIV
 80	  instruction.  Enables the -mhw-div compiler flag.
 81
 82config NIOS2_BMX_SUPPORT
 83	bool "Enable BMX instructions"
 84	depends on NIOS2_ARCH_REVISION = 2
 85	help
 86	  Set to true if you configured the Nios II R2 to include
 87	  the BMX Bit Manipulation Extension instructions. Enables
 88	  the -mbmx compiler flag.
 89
 90config NIOS2_CDX_SUPPORT
 91	bool "Enable CDX instructions"
 92	depends on NIOS2_ARCH_REVISION = 2
 93	help
 94	  Set to true if you configured the Nios II R2 to include
 95	  the CDX Bit Manipulation Extension instructions. Enables
 96	  the -mcdx compiler flag.
 97
 98config NIOS2_FPU_SUPPORT
 99	bool "Custom floating point instr support"
100	help
101	  Enables the -mcustom-fpu-cfg=60-1 compiler flag.
102
103config NIOS2_CI_SWAB_SUPPORT
104	bool "Byteswap custom instruction"
105	help
106	  Use the byteswap (endian converter) Nios II custom instruction provided
107	  by Altera and which can be enabled in QSYS builder. This accelerates
108	  endian conversions in the kernel (e.g. ntohs).
109
110config NIOS2_CI_SWAB_NO
111	int "Byteswap custom instruction number" if NIOS2_CI_SWAB_SUPPORT
112	default 0
113	help
114	  Number of the instruction as configured in QSYS Builder.
115
116comment "Cache settings"
117
118config CUSTOM_CACHE_SETTINGS
119	bool "Custom cache settings"
120	help
121	  This option allows you to tweak the cache settings used during early
122	  boot (where the information from device tree is not yet available).
123	  There should be no reason to change these values. Linux will work
124	  perfectly fine, even if the Nios II is configured with smaller caches.
125
126	  Say N here unless you know what you are doing.
127
128config NIOS2_DCACHE_SIZE
129	hex "D-Cache size" if CUSTOM_CACHE_SETTINGS
130	range 0x200 0x10000
131	default "0x800"
132	help
133	  Maximum possible data cache size.
134
135config NIOS2_DCACHE_LINE_SIZE
136	hex "D-Cache line size" if CUSTOM_CACHE_SETTINGS
137	range 0x10 0x20
138	default "0x20"
139	help
140	  Minimum possible data cache line size.
141
142config NIOS2_ICACHE_SIZE
143	hex "I-Cache size" if CUSTOM_CACHE_SETTINGS
144	range 0x200 0x10000
145	default "0x1000"
146	help
147	  Maximum possible instruction cache size.
148
149endmenu