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147 lines
4.3 KiB
147 lines
4.3 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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menu "Platform options" |
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comment "Memory settings" |
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config NIOS2_MEM_BASE |
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hex "Memory base address" |
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default "0x00000000" |
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help |
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This is the physical address of the memory that the kernel will run |
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from. This address is used to link the kernel and setup initial memory |
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management. You should take the raw memory address without any MMU |
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or cache bits set. |
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Please not that this address is used directly so you have to manually |
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do address translation if it's connected to a bridge. |
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comment "Device tree" |
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config NIOS2_DTB_AT_PHYS_ADDR |
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bool "DTB at physical address" |
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help |
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When enabled you can select a physical address to load the dtb from. |
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Normally this address is passed by a bootloader such as u-boot but |
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using this you can use a devicetree without a bootloader. |
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This way you can store a devicetree in NOR flash or an onchip rom. |
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Please note that this address is used directly so you have to manually |
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do address translation if it's connected to a bridge. Also take into |
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account that when using an MMU you'd have to ad 0xC0000000 to your |
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address |
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config NIOS2_DTB_PHYS_ADDR |
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hex "DTB Address" |
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depends on NIOS2_DTB_AT_PHYS_ADDR |
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default "0xC0000000" |
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help |
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Physical address of a dtb blob. |
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config NIOS2_DTB_SOURCE_BOOL |
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bool "Compile and link device tree into kernel image" |
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help |
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This allows you to specify a dts (device tree source) file |
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which will be compiled and linked into the kernel image. |
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config NIOS2_DTB_SOURCE |
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string "Device tree source file" |
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depends on NIOS2_DTB_SOURCE_BOOL |
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default "" |
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help |
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Absolute path to the device tree source (dts) file describing your |
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system. |
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comment "Nios II instructions" |
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config NIOS2_ARCH_REVISION |
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int "Select Nios II architecture revision" |
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range 1 2 |
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default 1 |
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help |
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Select between Nios II R1 and Nios II R2 . The architectures |
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are binary incompatible. Default is R1 . |
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config NIOS2_HW_MUL_SUPPORT |
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bool "Enable MUL instruction" |
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help |
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Set to true if you configured the Nios II to include the MUL |
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instruction. This will enable the -mhw-mul compiler flag. |
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config NIOS2_HW_MULX_SUPPORT |
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bool "Enable MULX instruction" |
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help |
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Set to true if you configured the Nios II to include the MULX |
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instruction. Enables the -mhw-mulx compiler flag. |
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config NIOS2_HW_DIV_SUPPORT |
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bool "Enable DIV instruction" |
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help |
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Set to true if you configured the Nios II to include the DIV |
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instruction. Enables the -mhw-div compiler flag. |
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config NIOS2_BMX_SUPPORT |
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bool "Enable BMX instructions" |
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depends on NIOS2_ARCH_REVISION = 2 |
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help |
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Set to true if you configured the Nios II R2 to include |
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the BMX Bit Manipulation Extension instructions. Enables |
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the -mbmx compiler flag. |
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config NIOS2_CDX_SUPPORT |
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bool "Enable CDX instructions" |
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depends on NIOS2_ARCH_REVISION = 2 |
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help |
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Set to true if you configured the Nios II R2 to include |
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the CDX Bit Manipulation Extension instructions. Enables |
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the -mcdx compiler flag. |
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config NIOS2_FPU_SUPPORT |
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bool "Custom floating point instr support" |
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help |
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Enables the -mcustom-fpu-cfg=60-1 compiler flag. |
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config NIOS2_CI_SWAB_SUPPORT |
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bool "Byteswap custom instruction" |
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help |
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Use the byteswap (endian converter) Nios II custom instruction provided |
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by Altera and which can be enabled in QSYS builder. This accelerates |
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endian conversions in the kernel (e.g. ntohs). |
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config NIOS2_CI_SWAB_NO |
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int "Byteswap custom instruction number" if NIOS2_CI_SWAB_SUPPORT |
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default 0 |
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help |
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Number of the instruction as configured in QSYS Builder. |
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comment "Cache settings" |
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config CUSTOM_CACHE_SETTINGS |
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bool "Custom cache settings" |
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help |
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This option allows you to tweak the cache settings used during early |
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boot (where the information from device tree is not yet available). |
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There should be no reason to change these values. Linux will work |
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perfectly fine, even if the Nios II is configured with smaller caches. |
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Say N here unless you know what you are doing. |
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config NIOS2_DCACHE_SIZE |
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hex "D-Cache size" if CUSTOM_CACHE_SETTINGS |
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range 0x200 0x10000 |
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default "0x800" |
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help |
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Maximum possible data cache size. |
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config NIOS2_DCACHE_LINE_SIZE |
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hex "D-Cache line size" if CUSTOM_CACHE_SETTINGS |
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range 0x10 0x20 |
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default "0x20" |
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help |
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Minimum possible data cache line size. |
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config NIOS2_ICACHE_SIZE |
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hex "I-Cache size" if CUSTOM_CACHE_SETTINGS |
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range 0x200 0x10000 |
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default "0x1000" |
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help |
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Maximum possible instruction cache size. |
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endmenu
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