1 # SPDX-License-Identifier: GPL-2.0-only
2 menu "Platform options"
4 comment "Memory settings"
7 hex "Memory base address"
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
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.
19 config NIOS2_DTB_AT_PHYS_ADDR
20 bool "DTB at physical address"
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
31 config NIOS2_DTB_PHYS_ADDR
33 depends on NIOS2_DTB_AT_PHYS_ADDR
36 Physical address of a dtb blob.
38 config NIOS2_DTB_SOURCE_BOOL
39 bool "Compile and link device tree into kernel image"
41 This allows you to specify a dts (device tree source) file
42 which will be compiled and linked into the kernel image.
44 config NIOS2_DTB_SOURCE
45 string "Device tree source file"
46 depends on NIOS2_DTB_SOURCE_BOOL
49 Absolute path to the device tree source (dts) file describing your
52 comment "Nios II instructions"
54 config NIOS2_ARCH_REVISION
55 int "Select Nios II architecture revision"
59 Select between Nios II R1 and Nios II R2 . The architectures
60 are binary incompatible. Default is R1 .
62 config NIOS2_HW_MUL_SUPPORT
63 bool "Enable MUL instruction"
65 Set to true if you configured the Nios II to include the MUL
66 instruction. This will enable the -mhw-mul compiler flag.
68 config NIOS2_HW_MULX_SUPPORT
69 bool "Enable MULX instruction"
71 Set to true if you configured the Nios II to include the MULX
72 instruction. Enables the -mhw-mulx compiler flag.
74 config NIOS2_HW_DIV_SUPPORT
75 bool "Enable DIV instruction"
77 Set to true if you configured the Nios II to include the DIV
78 instruction. Enables the -mhw-div compiler flag.
80 config NIOS2_BMX_SUPPORT
81 bool "Enable BMX instructions"
82 depends on NIOS2_ARCH_REVISION = 2
84 Set to true if you configured the Nios II R2 to include
85 the BMX Bit Manipulation Extension instructions. Enables
86 the -mbmx compiler flag.
88 config NIOS2_CDX_SUPPORT
89 bool "Enable CDX instructions"
90 depends on NIOS2_ARCH_REVISION = 2
92 Set to true if you configured the Nios II R2 to include
93 the CDX Bit Manipulation Extension instructions. Enables
94 the -mcdx compiler flag.
96 config NIOS2_FPU_SUPPORT
97 bool "Custom floating point instr support"
99 Enables the -mcustom-fpu-cfg=60-1 compiler flag.
101 config NIOS2_CI_SWAB_SUPPORT
102 bool "Byteswap custom instruction"
104 Use the byteswap (endian converter) Nios II custom instruction provided
105 by Altera and which can be enabled in QSYS builder. This accelerates
106 endian conversions in the kernel (e.g. ntohs).
108 config NIOS2_CI_SWAB_NO
109 int "Byteswap custom instruction number" if NIOS2_CI_SWAB_SUPPORT
112 Number of the instruction as configured in QSYS Builder.
114 comment "Cache settings"
116 config CUSTOM_CACHE_SETTINGS
117 bool "Custom cache settings"
119 This option allows you to tweak the cache settings used during early
120 boot (where the information from device tree is not yet available).
121 There should be no reason to change these values. Linux will work
122 perfectly fine, even if the Nios II is configured with smaller caches.
124 Say N here unless you know what you are doing.
126 config NIOS2_DCACHE_SIZE
127 hex "D-Cache size" if CUSTOM_CACHE_SETTINGS
131 Maximum possible data cache size.
133 config NIOS2_DCACHE_LINE_SIZE
134 hex "D-Cache line size" if CUSTOM_CACHE_SETTINGS
138 Minimum possible data cache line size.
140 config NIOS2_ICACHE_SIZE
141 hex "I-Cache size" if CUSTOM_CACHE_SETTINGS
145 Maximum possible instruction cache size.