mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-12 22:26:16 +09:00
d2db2a8fa4
This patch adds kconfig option RISCV_SMODE to run U-Boot in S-mode. When this opition is enabled we use s<xyz> CSRs instead of m<xyz> CSRs. It is important to note that there is no equivalent S-mode CSR for misa and mhartid CSRs so we expect M-mode runtime firmware (BBL or equivalent) to emulate misa and mhartid CSR read. In-future, we will have more patches to avoid accessing misa and mhartid CSRs from S-mode. Signed-off-by: Anup Patel <anup@brainfault.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
70 lines
1.2 KiB
Plaintext
70 lines
1.2 KiB
Plaintext
menu "RISC-V architecture"
|
|
depends on RISCV
|
|
|
|
config SYS_ARCH
|
|
default "riscv"
|
|
|
|
choice
|
|
prompt "Target select"
|
|
optional
|
|
|
|
config TARGET_AX25_AE350
|
|
bool "Support ax25-ae350"
|
|
|
|
config TARGET_QEMU_VIRT
|
|
bool "Support QEMU Virt Board"
|
|
|
|
endchoice
|
|
|
|
# board-specific options below
|
|
source "board/AndesTech/ax25-ae350/Kconfig"
|
|
source "board/emulation/qemu-riscv/Kconfig"
|
|
|
|
# platform-specific options below
|
|
source "arch/riscv/cpu/ax25/Kconfig"
|
|
|
|
# architecture-specific options below
|
|
|
|
choice
|
|
prompt "Base ISA"
|
|
default ARCH_RV32I
|
|
|
|
config ARCH_RV32I
|
|
bool "RV32I"
|
|
select 32BIT
|
|
help
|
|
Choose this option to target the RV32I base integer instruction set.
|
|
|
|
config ARCH_RV64I
|
|
bool "RV64I"
|
|
select 64BIT
|
|
select PHYS_64BIT
|
|
help
|
|
Choose this option to target the RV64I base integer instruction set.
|
|
|
|
endchoice
|
|
|
|
config RISCV_ISA_C
|
|
bool "Emit compressed instructions"
|
|
default y
|
|
help
|
|
Adds "C" to the ISA subsets that the toolchain is allowed to emit
|
|
when building U-Boot, which results in compressed instructions in the
|
|
U-Boot binary.
|
|
|
|
config RISCV_ISA_A
|
|
def_bool y
|
|
|
|
config RISCV_SMODE
|
|
bool "Run in S-Mode"
|
|
help
|
|
Enable this option to build U-Boot for RISC-V S-Mode
|
|
|
|
config 32BIT
|
|
bool
|
|
|
|
config 64BIT
|
|
bool
|
|
|
|
endmenu
|