riscv - 随笔分类(第2页) - tycoon3

RISC-V MCU堆栈机制

摘要：1、什么是堆栈？在嵌入式的世界里，堆栈通常指的是栈，严格来说，堆栈分为堆(Heap)和栈(Stack)。栈(Stack): 一种顺序数据结构，满足后进先出（Last-In / First-Out）的原则，由编译器自动分配和释放。使用一级缓存，调用完立即释放。堆(Heap)：类似于链表结构，可对阅读全文

posted @ 2021-12-11 15:04 tycoon3 阅读(987) 评论(0) 推荐(0)

RISC-V from scratch 4: Creating a function prologue for our UART driver (2 / 3)

摘要：Setup If you have worked through all the previous posts in this series, you can cd to your riscv-from-scratch directory and skip this section. If you’ 阅读全文

posted @ 2021-12-11 10:13 tycoon3 阅读(128) 评论(0) 推荐(0)

交叉编译riscv64-linux-gnu-gcc

摘要：root@ubuntu:~# riscv64-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=riscv64-linux-gnu-gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/riscv64-linux-g 阅读全文

posted @ 2021-12-10 16:04 tycoon3 阅读(2376) 评论(0) 推荐(0)

linux 驱动寄存器读写

摘要：linux driver write writel_relaxed readb()和writeb()系列函数 1 #define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; }) 2 #define readw_relaxed(c) ({ u1 阅读全文

posted @ 2021-11-16 17:58 tycoon3 阅读(1048) 评论(0) 推荐(0)

Failed to initialize ' timer@0'

摘要：[ 0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [2] [ 0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max 阅读全文

posted @ 2021-11-16 16:56 tycoon3 阅读(215) 评论(0) 推荐(0)

QEMU OpenSBI 裸机开发之定时器中断

摘要：[root@centos7 lesson14]# make riscv64-unknown-elf-gcc -c -o entry.o entry.S riscv64-unknown-elf-gcc -Wall -Werror -O -fno-omit-frame-pointer -ggdb -mc 阅读全文

posted @ 2021-11-08 18:07 tycoon3 阅读(236) 评论(0) 推荐(0)

opensbi smp同步

摘要：特权模式(privilege mode) /* * Only the HART supporting privilege mode specified in the * scratch->next_mode should be allowed to become the coldboot * HAR 阅读全文

posted @ 2021-11-04 16:50 tycoon3 阅读(189) 评论(0) 推荐(0)

Linux内核打实时补丁preempt_rt

摘要：补丁下载内核代码 root@Ubuntu-riscv64:/usr/src/linux-5.14# head Makefile # SPDX-License-Identifier: GPL-2.0 VERSION = 5 PATCHLEVEL = 14 SUBLEVEL = 0 EXTRAVERS 阅读全文

posted @ 2021-10-14 10:40 tycoon3 阅读(3004) 评论(0) 推荐(0)

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