diff options
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 60 |
1 files changed, 56 insertions, 4 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 61514e0d268e..6ddf5a2eb84d 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -28,8 +28,8 @@ config RISCV select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_SET_DIRECT_MAP select ARCH_HAS_SET_MEMORY - select ARCH_HAS_STRICT_KERNEL_RWX if MMU - select ARCH_HAS_STRICT_MODULE_RWX if MMU + select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL + select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT @@ -468,7 +468,7 @@ config EFI_STUB config EFI bool "UEFI runtime support" - depends on OF + depends on OF && !XIP_KERNEL select LIBFDT select UCS2_STRING select EFI_PARAMS_FROM_FDT @@ -492,11 +492,63 @@ config STACKPROTECTOR_PER_TASK def_bool y depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS +config PHYS_RAM_BASE_FIXED + bool "Explicitly specified physical RAM address" + default n + +config PHYS_RAM_BASE + hex "Platform Physical RAM address" + depends on PHYS_RAM_BASE_FIXED + default "0x80000000" + help + This is the physical address of RAM in the system. It has to be + explicitly specified to run early relocations of read-write data + from flash to RAM. + +config XIP_KERNEL + bool "Kernel Execute-In-Place from ROM" + depends on MMU && SPARSEMEM + # This prevents XIP from being enabled by all{yes,mod}config, which + # fail to build since XIP doesn't support large kernels. + depends on !COMPILE_TEST + select PHYS_RAM_BASE_FIXED + help + Execute-In-Place allows the kernel to run from non-volatile storage + directly addressable by the CPU, such as NOR flash. This saves RAM + space since the text section of the kernel is not loaded from flash + to RAM. Read-write sections, such as the data section and stack, + are still copied to RAM. The XIP kernel is not compressed since + it has to run directly from flash, so it will take more space to + store it. The flash address used to link the kernel object files, + and for storing it, is configuration dependent. Therefore, if you + say Y here, you must know the proper physical address where to + store the kernel image depending on your own flash memory usage. + + Also note that the make target becomes "make xipImage" rather than + "make zImage" or "make Image". The final kernel binary to put in + ROM memory will be arch/riscv/boot/xipImage. + + SPARSEMEM is required because the kernel text and rodata that are + flash resident are not backed by memmap, then any attempt to get + a struct page on those regions will trigger a fault. + + If unsure, say N. + +config XIP_PHYS_ADDR + hex "XIP Kernel Physical Location" + depends on XIP_KERNEL + default "0x21000000" + help + This is the physical address in your flash memory the kernel will + be linked for and stored to. This address is dependent on your + own flash usage. + endmenu config BUILTIN_DTB - def_bool n + bool depends on OF + default y if XIP_KERNEL menu "Power management options" |