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 ---
arch/Kconfig | 6 +++ arch/riscv/Kconfig | 3 ++ arch/riscv/cpu/generic/Kconfig | 3 ++ arch/riscv/cpu/start.S | 23 +++++++++- arch/riscv/cpu/u-boot-spl.lds | 82 ++++++++++++++++++++++++++++++++++ arch/riscv/include/asm/spl.h | 31 +++++++++++++ arch/riscv/lib/Makefile | 1 + arch/riscv/lib/spl.c | 48 ++++++++++++++++++++ 8 files changed, 196 insertions(+), 1 deletion(-) create mode 100644 arch/riscv/cpu/u-boot-spl.lds create mode 100644 arch/riscv/include/asm/spl.h create mode 100644 arch/riscv/lib/spl.c
diff --git a/arch/Kconfig b/arch/Kconfig index a946af816f..5462c9b933 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -76,6 +76,12 @@ config RISCV imply MTD imply TIMER imply CMD_DM + imply SPL_DM + imply SPL_OF_CONTROL + imply SPL_LIBCOMMON_SUPPORT + imply SPL_LIBGENERIC_SUPPORT + imply SPL_SERIAL_SUPPORT + imply SPL_TIMER
config SANDBOX bool "Sandbox" diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index b8d01ba8e1..01975d7c60 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -226,4 +226,7 @@ config STACK_SIZE_SHIFT int default 13
+config SPL_LDSCRIPT + default "arch/riscv/cpu/u-boot-spl.lds" + endmenu diff --git a/arch/riscv/cpu/generic/Kconfig b/arch/riscv/cpu/generic/Kconfig index b7552f539f..b2cb155d6d 100644 --- a/arch/riscv/cpu/generic/Kconfig +++ b/arch/riscv/cpu/generic/Kconfig @@ -10,3 +10,6 @@ config GENERIC_RISCV imply RISCV_TIMER imply SIFIVE_CLINT if (RISCV_MMODE || SPL_RISCV_MMODE) imply CMD_CPU + imply SPL_CPU_SUPPORT + imply SPL_OPENSBI + imply SPL_LOAD_FIT diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index 08b9812c4d..e053197645 100644 --- a/arch/riscv/cpu/start.S +++ b/arch/riscv/cpu/start.S @@ -76,7 +76,11 @@ _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: @@ -160,7 +164,24 @@ 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) diff --git a/arch/riscv/cpu/u-boot-spl.lds b/arch/riscv/cpu/u-boot-spl.lds new file mode 100644 index 0000000000..32255d58de --- /dev/null +++ b/arch/riscv/cpu/u-boot-spl.lds @@ -0,0 +1,82 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Based on arch/riscv/cpu/u-boot.lds, which is + * Copyright (C) 2017 Andes Technology Corporation + * Rick Chen, Andes Technology Corporation rick@andestech.com + * + * and arch/mips/cpu/u-boot-spl.lds. + */ +MEMORY { .spl_mem : ORIGIN = IMAGE_TEXT_BASE, LENGTH = IMAGE_MAX_SIZE } +MEMORY { .bss_mem : ORIGIN = CONFIG_SPL_BSS_START_ADDR, \ + LENGTH = CONFIG_SPL_BSS_MAX_SIZE } + +OUTPUT_ARCH("riscv") +ENTRY(_start) + +SECTIONS +{ + . = ALIGN(4); + .text : { + arch/riscv/cpu/start.o (.text) + *(.text*) + } > .spl_mem + + . = ALIGN(4); + .rodata : { + *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) + } > .spl_mem + + . = ALIGN(4); + .data : { + *(.data*) + } > .spl_mem + . = ALIGN(4); + + .got : { + __got_start = .; + *(.got.plt) *(.got) + __got_end = .; + } > .spl_mem + + . = ALIGN(4); + + .u_boot_list : { + KEEP(*(SORT(.u_boot_list*))); + } > .spl_mem + + . = ALIGN(4); + + .binman_sym_table : { + __binman_sym_start = .; + KEEP(*(SORT(.binman_sym*))); + __binman_sym_end = .; + } > .spl_mem + + . = ALIGN(4); + + /DISCARD/ : { *(.rela.plt*) } + .rela.dyn : { + __rel_dyn_start = .; + *(.rela*) + __rel_dyn_end = .; + } > .spl_mem + + . = ALIGN(4); + + .dynsym : { + __dyn_sym_start = .; + *(.dynsym) + __dyn_sym_end = .; + } > .spl_mem + + . = ALIGN(4); + + _end = .; + + .bss : { + __bss_start = .; + *(.bss*) + . = ALIGN(4); + __bss_end = .; + } > .bss_mem +} diff --git a/arch/riscv/include/asm/spl.h b/arch/riscv/include/asm/spl.h new file mode 100644 index 0000000000..45c03fb9b6 --- /dev/null +++ b/arch/riscv/include/asm/spl.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Based on arch/mips/include/asm/spl.h. + * + * (C) Copyright 2012 + * Texas Instruments, <www.ti.com> + */ +#ifndef _ASM_RISCV_SPL_H_ +#define _ASM_RISCV_SPL_H_ + +enum { + BOOT_DEVICE_RAM, + BOOT_DEVICE_MMC1, + BOOT_DEVICE_MMC2, + BOOT_DEVICE_MMC2_2, + BOOT_DEVICE_NAND, + BOOT_DEVICE_ONENAND, + BOOT_DEVICE_NOR, + BOOT_DEVICE_UART, + BOOT_DEVICE_SPI, + BOOT_DEVICE_USB, + BOOT_DEVICE_SATA, + BOOT_DEVICE_I2C, + BOOT_DEVICE_BOARD, + BOOT_DEVICE_DFU, + BOOT_DEVICE_XIP, + BOOT_DEVICE_BOOTROM, + BOOT_DEVICE_NONE +}; + +#endif diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile index e4bc5df297..c9179a5ff8 100644 --- a/arch/riscv/lib/Makefile +++ b/arch/riscv/lib/Makefile @@ -22,6 +22,7 @@ obj-y += interrupts.o obj-y += reset.o obj-y += setjmp.o obj-$(CONFIG_SMP) += smp.o +obj-$(CONFIG_SPL_BUILD) += spl.o
# For building EFI apps CFLAGS_$(EFI_CRT0) := $(CFLAGS_EFI) diff --git a/arch/riscv/lib/spl.c b/arch/riscv/lib/spl.c new file mode 100644 index 0000000000..bea8695987 --- /dev/null +++ b/arch/riscv/lib/spl.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Fraunhofer AISEC, + * Lukas Auer lukas.auer@aisec.fraunhofer.de + */ +#include <common.h> +#include <spl.h> +#include <asm/smp.h> + +DECLARE_GLOBAL_DATA_PTR; + +__weak void board_init_f(ulong dummy) +{ + int ret; + + ret = spl_early_init(); + if (ret) + panic("spl_early_init() failed: %d\n", ret); + + arch_cpu_init_dm(); + + preloader_console_init(); +} + +void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image) +{ + typedef void __noreturn (*image_entry_riscv_t)(ulong hart, void *dtb); + void *fdt_blob; + int ret; + +#if CONFIG_IS_ENABLED(LOAD_FIT) || CONFIG_IS_ENABLED(LOAD_FIT_FULL) + fdt_blob = spl_image->fdt_addr; +#else + fdt_blob = (void *)gd->fdt_blob; +#endif + + image_entry_riscv_t image_entry = + (image_entry_riscv_t)spl_image->entry_point; + invalidate_icache_all(); + + debug("image entry point: 0x%lX\n", spl_image->entry_point); +#ifdef CONFIG_SMP + ret = smp_call_function(spl_image->entry_point, (ulong)fdt_blob, 0); + if (ret) + hang(); +#endif + image_entry(gd->arch.boot_hart, fdt_blob); +}