VxWorks 学习笔记－Reconfiguring VxWorks

§ Reconfiguring VxWorks

Application的启动

在函数usrAppInit( )中，启动用户的应用程序。

调用关系：usrRoot( ) --> usrAppInit( )

ROOT_STACK_SIZE定义任务tUsrRoot的堆栈大小

VxWorks Build Targets

vxworks: RAM based VxWorks image, linked to RAM_LOW_ADRS. It is loaded into RAM via some external program such as a bootROM. This is the default development image.

ROMable images contain bootstrap code which copies VxWorks from ROM to RAM, decompressing if necessary. The bootstrap code is target/config/comps/src/romStart.c, which is shared by all ROMable and ROMresident projects.

VxWorks_rom

vxWorks_romCompress

vxWorks_romResident

几种类型的应用

ROMable Images (包含引导代码和vxWorks image)

Compressed ROMable Startup

vxWorks_romResident

vxWorks_romResident image contains start-up code which copies only the VxWorks data segment into RAM at RAM_LOW_ADRS.

“Downloadable” Image + bootrom Program (引导代码和vxWorks image分离)

加载过程的配置参数

RAM中有两个位置用于加载：RAM_LOW_ADRS， RAM_HIGH_ADRS 。通过使用这两个位置，完成引导过程。最终的执行部分要放在： RAM_LOW_ADRS 。

ROM配置参数：ROM_TEXT_ADRS和ROM_SIZE