[U-Boot] [PATCH v2 01/12] riscv: cpu: Add nx25 to support RISC-V
陳建志
rickchen36 at gmail.com
Tue Jan 9 05:47:23 UTC 2018
Hi Tom
How about the Andes NX25 cpu for RISC-V arch patchsets [PATCH v2 x/12]
reviewing status ?
Is everything ok ?
Rick
2017-12-26 13:55 GMT+08:00 Andes <uboot at andestech.com>:
> From: Rick Chen <rick at andestech.com>
>
> Add Andes nx25 cpu core (called AndesStar V5) to support RISC-V arch
>
> Verifications:
> 1. startup and relocation ok.
> 2. boot from rom or ram both ok.
> 2. timer driver ok.
> 3. uart driver ok
> 4. mmc driver ok
> 5. spi driver ok.
> 6. 32/64 bit both ok.
>
> Detail verification message please see doc/README.ae250.
>
> Signed-off-by: Rick Chen <rick at andestech.com>
> Signed-off-by: Rick Chen <rickchen36 at gmail.com>
> Signed-off-by: Greentime Hu <green.hu at gmail.com>
> Cc: Padmarao Begari <Padmarao.Begari at microsemi.com>
> ---
> arch/riscv/cpu/nx25/Makefile | 10 ++
> arch/riscv/cpu/nx25/cpu.c | 33 +++++
> arch/riscv/cpu/nx25/start.S | 291 +++++++++++++++++++++++++++++++++++++++++
> arch/riscv/cpu/nx25/u-boot.lds | 69 ++++++++++
> 4 files changed, 403 insertions(+)
> create mode 100644 arch/riscv/cpu/nx25/Makefile
> create mode 100644 arch/riscv/cpu/nx25/cpu.c
> create mode 100644 arch/riscv/cpu/nx25/start.S
> create mode 100644 arch/riscv/cpu/nx25/u-boot.lds
>
> diff --git a/arch/riscv/cpu/nx25/Makefile b/arch/riscv/cpu/nx25/Makefile
> new file mode 100644
> index 0000000..5fcf100
> --- /dev/null
> +++ b/arch/riscv/cpu/nx25/Makefile
> @@ -0,0 +1,10 @@
> +#
> +# Copyright (C) 2017 Andes Technology Corporation
> +# Rick Chen, Andes Technology Corporation <rick at andestech.com>
> +#
> +# SPDX-License-Identifier: GPL-2.0+
> +#
> +
> +extra-y = start.o
> +
> +obj-y := cpu.o
> diff --git a/arch/riscv/cpu/nx25/cpu.c b/arch/riscv/cpu/nx25/cpu.c
> new file mode 100644
> index 0000000..5478f4f
> --- /dev/null
> +++ b/arch/riscv/cpu/nx25/cpu.c
> @@ -0,0 +1,33 @@
> +/*
> + * Copyright (C) 2017 Andes Technology Corporation
> + * Rick Chen, Andes Technology Corporation <rick at andestech.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +/* CPU specific code */
> +#include <common.h>
> +#include <command.h>
> +#include <watchdog.h>
> +#include <asm/cache.h>
> +
> +/*
> + * cleanup_before_linux() is called just before we call linux
> + * it prepares the processor for linux
> + *
> + * we disable interrupt and caches.
> + */
> +int cleanup_before_linux(void)
> +{
> + disable_interrupts();
> +
> + /* turn off I/D-cache */
> +
> + return 0;
> +}
> +
> +int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> +{
> + disable_interrupts();
> + panic("nx25-ae250 wdt not support yet.\n");
> +}
> diff --git a/arch/riscv/cpu/nx25/start.S b/arch/riscv/cpu/nx25/start.S
> new file mode 100644
> index 0000000..6a07663
> --- /dev/null
> +++ b/arch/riscv/cpu/nx25/start.S
> @@ -0,0 +1,291 @@
> +/*
> + * Startup Code for RISC-V Core
> + *
> + * Copyright (c) 2017 Microsemi Corporation.
> + * Copyright (c) 2017 Padmarao Begari <Padmarao.Begari at microsemi.com>
> + *
> + * Copyright (C) 2017 Andes Technology Corporation
> + * Rick Chen, Andes Technology Corporation <rick at andestech.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <asm-offsets.h>
> +#include <config.h>
> +#include <common.h>
> +#include <elf.h>
> +#include <asm/encoding.h>
> +
> +#ifdef CONFIG_32BIT
> +#define LREG lw
> +#define SREG sw
> +#define REGBYTES 4
> +#define RELOC_TYPE R_RISCV_32
> +#define SYM_INDEX 0x8
> +#define SYM_SIZE 0x10
> +#else
> +#define LREG ld
> +#define SREG sd
> +#define REGBYTES 8
> +#define RELOC_TYPE R_RISCV_64
> +#define SYM_INDEX 0x20
> +#define SYM_SIZE 0x18
> +#endif
> +
> +.section .text
> +.globl _start
> +_start:
> + j handle_reset
> +
> +nmi_vector:
> + j nmi_vector
> +
> +trap_vector:
> + j trap_entry
> +
> +.global trap_entry
> +handle_reset:
> + la t0, trap_entry
> + csrw mtvec, t0
> + csrwi mstatus, 0
> + csrwi mie, 0
> +
> +/*
> + * Do CPU critical regs init only at reboot,
> + * not when booting from ram
> + */
> +#ifdef CONFIG_INIT_CRITICAL
> + jal cpu_init_crit /* Do CPU critical regs init */
> +#endif
> +
> +/*
> + * Set stackpointer in internal/ex RAM to call board_init_f
> + */
> +call_board_init_f:
> + li t0, -16
> + li t1, CONFIG_SYS_INIT_SP_ADDR
> + and sp, t1, t0 /* force 16 byte alignment */
> +
> +#ifdef CONFIG_DEBUG_UART
> + jal debug_uart_init
> +#endif
> +
> +call_board_init_f_0:
> + mv a0, sp
> + jal board_init_f_alloc_reserve
> + mv sp, a0
> + jal board_init_f_init_reserve
> +
> + mv a0, zero /* a0 <-- boot_flags = 0 */
> + la t5, board_init_f
> + jr t5 /* jump to board_init_f() */
> +
> +/*
> + * void relocate_code (addr_sp, gd, addr_moni)
> + *
> + * This "function" does not return, instead it continues in RAM
> + * after relocating the monitor code.
> + *
> + */
> +.globl relocate_code
> +relocate_code:
> + mv s2, a0 /* save addr_sp */
> + mv s3, a1 /* save addr of gd */
> + mv s4, a2 /* save addr of destination */
> +
> +/*
> + *Set up the stack
> + */
> +stack_setup:
> + mv sp, s2
> + la t0, _start
> + sub t6, s4, t0 /* t6 <- relocation offset */
> + beq t0, s4, clear_bss /* skip relocation */
> +
> + mv t1, s4 /* t1 <- scratch for copy_loop */
> + la t3, __bss_start
> + sub t3, t3, t0 /* t3 <- __bss_start_ofs */
> + add t2, t0, t3 /* t2 <- source end address */
> +
> +copy_loop:
> + LREG t5, 0(t0)
> + addi t0, t0, REGBYTES
> + SREG t5, 0(t1)
> + addi t1, t1, REGBYTES
> + blt t0, t2, copy_loop
> +
> +/*
> + * Update dynamic relocations after board_init_f
> + */
> +fix_rela_dyn:
> + la t1, __rel_dyn_start
> + la t2, __rel_dyn_end
> + beq t1, t2, clear_bss
> + add t1, t1, t6 /* t1 <- rela_dyn_start in RAM */
> + add t2, t2, t6 /* t2 <- rela_dyn_end in RAM */
> +
> +/*
> + * skip first reserved entry: address, type, addend
> + */
> + bne t1, t2, 7f
> +
> +6:
> + LREG t5, -(REGBYTES*2)(t1) /* t5 <-- relocation info:type */
> + li t3, R_RISCV_RELATIVE /* reloc type R_RISCV_RELATIVE */
> + bne t5, t3, 8f /* skip non-RISCV_RELOC entries */
> + LREG t3, -(REGBYTES*3)(t1)
> + LREG t5, -(REGBYTES)(t1) /* t5 <-- addend */
> + add t5, t5, t6 /* t5 <-- location to fix up in RAM */
> + add t3, t3, t6 /* t3 <-- location to fix up in RAM */
> + SREG t5, 0(t3)
> +7:
> + addi t1, t1, (REGBYTES*3)
> + ble t1, t2, 6b
> +
> +8:
> + la t4, __dyn_sym_start
> + add t4, t4, t6
> +
> +9:
> + LREG t5, -(REGBYTES*2)(t1) /* t5 <-- relocation info:type */
> + srli t0, t5, SYM_INDEX /* t0 <--- sym table index */
> + andi t5, t5, 0xFF /* t5 <--- relocation type */
> + li t3, RELOC_TYPE
> + bne t5, t3, 10f /* skip non-addned entries */
> +
> + LREG t3, -(REGBYTES*3)(t1)
> + li t5, SYM_SIZE
> + mul t0, t0, t5
> + add s1, t4, t0
> + LREG t5, REGBYTES(s1)
> + add t5, t5, t6 /* t5 <-- location to fix up in RAM */
> + add t3, t3, t6 /* t3 <-- location to fix up in RAM */
> + SREG t5, 0(t3)
> +10:
> + addi t1, t1, (REGBYTES*3)
> + ble t1, t2, 9b
> +
> +/*
> + * trap update
> +*/
> + la t0, trap_entry
> + add t0, t0, t6
> + csrw mtvec, t0
> +
> +clear_bss:
> + la t0, __bss_start /* t0 <- rel __bss_start in FLASH */
> + add t0, t0, t6 /* t0 <- rel __bss_start in RAM */
> + la t1, __bss_end /* t1 <- rel __bss_end in FLASH */
> + add t1, t1, t6 /* t1 <- rel __bss_end in RAM */
> + li t2, 0x00000000 /* clear */
> + beq t0, t1, call_board_init_r
> +
> +clbss_l:
> + SREG t2, 0(t0) /* clear loop... */
> + addi t0, t0, REGBYTES
> + bne t0, t1, clbss_l
> +
> +/*
> + * We are done. Do not return, instead branch to second part of board
> + * initialization, now running from RAM.
> + */
> +call_board_init_r:
> + la t0, board_init_r
> + mv t4, t0 /* offset of board_init_r() */
> + add t4, t4, t6 /* real address of board_init_r() */
> +/*
> + * setup parameters for board_init_r
> + */
> + mv a0, s3 /* gd_t */
> + mv a1, s4 /* dest_addr */
> +
> +/*
> + * jump to it ...
> + */
> + jr t4 /* jump to board_init_r() */
> +
> +/*
> + * trap entry
> + */
> +trap_entry:
> + addi sp, sp, -32*REGBYTES
> + SREG x1, 1*REGBYTES(sp)
> + SREG x2, 2*REGBYTES(sp)
> + SREG x3, 3*REGBYTES(sp)
> + SREG x4, 4*REGBYTES(sp)
> + SREG x5, 5*REGBYTES(sp)
> + SREG x6, 6*REGBYTES(sp)
> + SREG x7, 7*REGBYTES(sp)
> + SREG x8, 8*REGBYTES(sp)
> + SREG x9, 9*REGBYTES(sp)
> + SREG x10, 10*REGBYTES(sp)
> + SREG x11, 11*REGBYTES(sp)
> + SREG x12, 12*REGBYTES(sp)
> + SREG x13, 13*REGBYTES(sp)
> + SREG x14, 14*REGBYTES(sp)
> + SREG x15, 15*REGBYTES(sp)
> + SREG x16, 16*REGBYTES(sp)
> + SREG x17, 17*REGBYTES(sp)
> + SREG x18, 18*REGBYTES(sp)
> + SREG x19, 19*REGBYTES(sp)
> + SREG x20, 20*REGBYTES(sp)
> + SREG x21, 21*REGBYTES(sp)
> + SREG x22, 22*REGBYTES(sp)
> + SREG x23, 23*REGBYTES(sp)
> + SREG x24, 24*REGBYTES(sp)
> + SREG x25, 25*REGBYTES(sp)
> + SREG x26, 26*REGBYTES(sp)
> + SREG x27, 27*REGBYTES(sp)
> + SREG x28, 28*REGBYTES(sp)
> + SREG x29, 29*REGBYTES(sp)
> + SREG x30, 30*REGBYTES(sp)
> + SREG x31, 31*REGBYTES(sp)
> + csrr a0, mcause
> + csrr a1, mepc
> + mv a2, sp
> + jal handle_trap
> + csrw mepc, a0
> +
> +/*
> + * Remain in M-mode after mret
> + */
> + li t0, MSTATUS_MPP
> + csrs mstatus, t0
> + LREG x1, 1*REGBYTES(sp)
> + LREG x2, 2*REGBYTES(sp)
> + LREG x3, 3*REGBYTES(sp)
> + LREG x4, 4*REGBYTES(sp)
> + LREG x5, 5*REGBYTES(sp)
> + LREG x6, 6*REGBYTES(sp)
> + LREG x7, 7*REGBYTES(sp)
> + LREG x8, 8*REGBYTES(sp)
> + LREG x9, 9*REGBYTES(sp)
> + LREG x10, 10*REGBYTES(sp)
> + LREG x11, 11*REGBYTES(sp)
> + LREG x12, 12*REGBYTES(sp)
> + LREG x13, 13*REGBYTES(sp)
> + LREG x14, 14*REGBYTES(sp)
> + LREG x15, 15*REGBYTES(sp)
> + LREG x16, 16*REGBYTES(sp)
> + LREG x17, 17*REGBYTES(sp)
> + LREG x18, 18*REGBYTES(sp)
> + LREG x19, 19*REGBYTES(sp)
> + LREG x20, 20*REGBYTES(sp)
> + LREG x21, 21*REGBYTES(sp)
> + LREG x22, 22*REGBYTES(sp)
> + LREG x23, 23*REGBYTES(sp)
> + LREG x24, 24*REGBYTES(sp)
> + LREG x25, 25*REGBYTES(sp)
> + LREG x26, 26*REGBYTES(sp)
> + LREG x27, 27*REGBYTES(sp)
> + LREG x28, 28*REGBYTES(sp)
> + LREG x29, 29*REGBYTES(sp)
> + LREG x30, 30*REGBYTES(sp)
> + LREG x31, 31*REGBYTES(sp)
> + addi sp, sp, 32*REGBYTES
> + mret
> +
> +#ifdef CONFIG_INIT_CRITICAL
> +cpu_init_crit:
> + ret
> +#endif
> diff --git a/arch/riscv/cpu/nx25/u-boot.lds b/arch/riscv/cpu/nx25/u-boot.lds
> new file mode 100644
> index 0000000..936fd77
> --- /dev/null
> +++ b/arch/riscv/cpu/nx25/u-boot.lds
> @@ -0,0 +1,69 @@
> +/*
> + * Copyright (C) 2017 Andes Technology Corporation
> + * Rick Chen, Andes Technology Corporation <rick at andestech.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +OUTPUT_ARCH("riscv")
> +ENTRY(_start)
> +
> +SECTIONS
> +{
> + . = ALIGN(4);
> + .text :
> + {
> + arch/riscv/cpu/nx25/start.o (.text)
> + *(.text)
> + }
> +
> + . = ALIGN(4);
> + .rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
> +
> + . = ALIGN(4);
> + .data : {
> + __global_pointer$ = . + 0x800;
> + *(.data*)
> + }
> + . = ALIGN(4);
> +
> + .got : {
> + __got_start = .;
> + *(.got.plt) *(.got)
> + __got_end = .;
> + }
> +
> + . = ALIGN(4);
> +
> + .u_boot_list : {
> + KEEP(*(SORT(.u_boot_list*)));
> + }
> +
> + . = ALIGN(4);
> +
> + /DISCARD/ : { *(.rela.plt*) }
> + .rela.dyn : {
> + __rel_dyn_start = .;
> + *(.rela*)
> + __rel_dyn_end = .;
> + }
> +
> + . = ALIGN(4);
> +
> + .dynsym : {
> + __dyn_sym_start = .;
> + *(.dynsym)
> + __dyn_sym_end = .;
> + }
> +
> + . = ALIGN(4);
> +
> + _end = .;
> +
> + .bss : {
> + __bss_start = .;
> + *(.bss)
> + . = ALIGN(4);
> + __bss_end = .;
> + }
> +
> +}
> --
> 2.7.4
>
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