tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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