Abstract: This paper elaborates the initial flow of Loongson Basic Input-Output System(BIOS) based on PMON and Video Graphics Array(VGA) BIOS emulator to emulate the initial x86 binaries in ROM of ATI VGA Card. The critical issues such as the initial process of PCI devices, VGA BIOS emulator, and the distribution of North Bridge’s address ranges are discussed. After debugging and extensive tests, expanded Loongson 2E BIOS has run reliably in mainbords for Loongson 2E, and can steadily load Debian kernel ported for Loongson 2E.

Key words: Loongson, Basic Input-Output System(BIOS), Video Graphics Array(VGA)

摘要： 阐述基于PMON扩展后的龙芯基本输入输出系统(BIOS)的初始化流程以及ATI显卡BIOS的模拟器原理，针对自检过程中PCI设备的初始化、视频图形阵列(VGA) BIOS模拟器以及北桥的地址空间分配等关键性问题，给出相应的解决办法。经过调试和测试，扩展后的龙芯BIOS已在基于龙芯2E处理器的主板上可靠运行，能稳定加载为龙芯2E移植的Linux Debian操作系统内核。

关键词: 龙芯, 基本输入输出系统, 视频图形阵列

CLC Number: 

• TP303