port_freertos_to_qemu_a57_virt

• Porting FreeRTOS to QEMU (-M virt -cpu cortex-a57). I am studying now.
  • The booting procedure bases from u-boot
  • The FreeRTOS project bases from FreeRTOSv10.0.1/FreeRTOS/Demo/CORTEX_A53_64-bit_UltraScale_MPSoC
  • Currently, the default exception level in booting is EL1.
• Status
  • Basic Uart works.
    • uart_putc(), uart_puts(), uart_puthex()
  • Basic FreeRTOS works.
    • configASSERT(), xTaskCreate(), vTaskStartScheduler()
  • printf() works.
  • Basic examples work.
    • Queue, Mutex, Binary Semaphore and software timer.
• Branch: nvdla_test
  • Porting vp/tests/nvdla_bdma_mmio Successfully.
  • Porting kernel driver. (Halt)
    • We need drm.ko and opendla.ko. But drm.ko is prebuilt, there is no source code.

Issues

• GDB can't step into main() if missing lable: magic_label in start.S (commit 0ddf0c433d759b763c84106ee4810e5f809a78c3)

Reference:

• Project:
  • aarch64-bare-metal-qemu.
    • Directly using UARTDR(UART Data Register) to send out the characters.
  • ARM926 interrupts in QEMU
    • The basic uart interrupt example
  • FreeRTOS-GCC-ARM926ejs
    • ARM9EJ-S Technical Reference Manual - DDI0222
    • Building Bare-Metal ARM Systems with GNU: Part 2
  • raspberrypi
  • sample-tsk-sw
  • armv8-bare-metal
    • My study, including the basic booting, gic and timer
  • FreeRTOSv10.0.1/FreeRTOS/Demo/CORTEX_A53_64-bit_UltraScale_MPSoC
• QEMU
  • QEMU version 2.12.50 User Documentation
  • virt.c
• Makefile
  • Makefile範例教學
  • GNU 的連結工具 (ld, nm, objdump, ar)
  • GCC Command-Line Options
  • LD Index
• FreeRTOS
  • Start
    • Creating a New FreeRTOS Project
    • FreeRTOS Quick Start Guide
    • Getting Started with Simple FreeRTOS Projects
    • Hardware independent FreeRTOS example
    • FreeRTOS Tutorial
    • Coding Standard and Style Guide
  • Memory
    • Memory Management
    • Static Vs Dynamic Memory Allocation
    • Statically Allocated FreeRTOS Reference Project
  • GIC
    • That incorporate a Generic Interrupt Controller (GIC)
    • 淺談優先權，從ARM Cortex-M到FreeRTOS設定
  • FreeRTOS Tutorial
  • xTimerCreate
• U-Boot
  • U-Boot on QEMU's 'virt' machine on ARM & AArch64
  • What is the difference between ELF files and bin files?
  • U-BOOT-2016.07移植 (第一篇) 初步分析
• GDB
  • GNU GDB Debugger Command Cheat Sheet
  • Debugging with GDB （入門篇）
  • GDB Debugging ARM U-Boot on QEMU
  • Use Qemu GDB to forcely debug Linux early boot process
  • how can one see content of stack with gdb
  • 10.6 Examining Memory
• ARM
  • iOS开发同学的arm64汇编入门
  • Arm® Compiler armasm User Guide
  • Application Note Bare-metal Boot Code for ARMv8-A Processors Version 1.0
  • ARM® Architecture Reference Manual ARMv8, for ARMv8-A architecture profile Beta
  • ARM® Cortex®-A57 MPCore™ Processor Revision: r1p0 Technical Reference Manual
  • ARM® Cortex®-A Series Version: 1.0 Programmer’s Guide for ARMv8-A
  • ARM® Generic Interrupt Controller Architecture Specification GIC architecture version 3.0 and version 4.0
• Compile
  • GNU 的連結工具 (ld, nm, objdump, ar)
  • Makefile
    • Makefile的賦值運算符(=, :=, +=, ?=)
  • GCC
    • GCC Command-Line Options
    • Weak symbol
      • 弱符號 - 維基百科
      • Weak references and definitions
  • Assembler
    • Writing ARM Assembly Language
    • ARM組語備忘錄
    • Using as
• printf()
  • Write your own printf() function in c
  • Wiki: stdarg.h
  • printf-stdarg.c