diff options
| author | Lukas Auer <lukas.auer@aisec.fraunhofer.de> | 2019-08-21 22:14:45 +0300 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2019-08-26 11:07:42 +0300 |
| commit | 8c59f2023cc8d4ab32b3988193ff2eb116df5995 (patch) | |
| tree | f00b5a0faf61438352a4a8caab2d62a8f9539f2c /arch/riscv/cpu/start.S | |
| parent | 5e30e45c83264841018dc8135034426fd0c0f857 (diff) | |
| download | u-boot-8c59f2023cc8d4ab32b3988193ff2eb116df5995.tar.xz | |
riscv: add SPL support
U-Boot SPL on the generic RISC-V CPU supports two boot flows, directly
jumping to the image and via OpenSBI firmware. In the first case, both
U-Boot SPL and proper must be compiled to run in the same privilege
mode. Using OpenSBI firmware, U-Boot SPL must be compiled for machine
mode and U-Boot proper for supervisor mode.
To be able to use SPL, boards have to provide a supported SPL boot
device.
Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Diffstat (limited to 'arch/riscv/cpu/start.S')
| -rw-r--r-- | arch/riscv/cpu/start.S | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index e82ee9e365..66c603906d 100644 --- a/arch/riscv/cpu/start.S +++ b/arch/riscv/cpu/start.S @@ -75,7 +75,11 @@ _start: */ call_board_init_f: li t0, -16 +#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK) + li t1, CONFIG_SPL_STACK +#else li t1, CONFIG_SYS_INIT_SP_ADDR +#endif and sp, t1, t0 /* force 16 byte alignment */ call_board_init_f_0: @@ -159,7 +163,24 @@ wait_for_gd_init: mv a0, zero /* a0 <-- boot_flags = 0 */ la t5, board_init_f - jr t5 /* jump to board_init_f() */ + jalr t5 /* jump to board_init_f() */ + +#ifdef CONFIG_SPL_BUILD +spl_clear_bss: + la t0, __bss_start + la t1, __bss_end + beq t0, t1, spl_call_board_init_r + +spl_clear_bss_loop: + SREG zero, 0(t0) + addi t0, t0, REGBYTES + bne t0, t1, spl_clear_bss_loop + +spl_call_board_init_r: + mv a0, zero + mv a1, zero + jal board_init_r +#endif /* * void relocate_code (addr_sp, gd, addr_moni) |