基于Xilinx FPGA上运行的Microblaze可编程软件处理器,首先介绍了SREC格式,以及利用Xilinx SDK集成的SREC SPI Bootloader引导应用程序启动流程,并指出流程中存在的不足。然后介绍了ELF文件结构,并根据ELF文件特点重写Bootloader程序,改进后的Bootloader流程中,不再进行SREC与ELF之间的格式转换,大大减少了启动过程中内存拷贝次数,有效缩短了启动时间。最后,通过不同系统主频下两种Bootloader的引导应用程序启动时间测试,证明了改进的Bootloader程序的高效性。
Abstract
The article is based on the Microblaze programmable software processor running on Xilinx FPGA.The SREC format and the process of booting an application using the SREC SPI Bootloader integrated in Xilinx SDK are introduced,and points out the shortcomings of the process.Then,the ELF file structure is introduced and based on its features,rewrites the Bootloader program.In the improved Bootloader process,there is no longer a need for conversion between the SREC and ELF formats,greatly reducing the number of memory copies during the startup process resulting in a significant reduction in startup time.Finally,by testing the startup time of the two Bootloaders under different system clock frequencies,the efficiency of the improved Bootloader program is demonstrated.
关键词
Microblaze /
SREC /
Bootloader /
启动优化
Key words
Microblaze /
SREC /
Bootloader /
startup optimization
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