METHOD FOR IMPLEMENTING BASIC INPUT AND OUTPUT SYSTEM (BIOS) OF LOONGSON CPU MAINBOARD AND INTERRUPT METHOD THEREOF

摘要

A method for implementing Basic Input and Output System (BIOS) of Loongson CPU mainboard and the interrupt method thereof are provided. The methods include: mapping and translating the address of the Loongson CPU and a north bridge chip, mapping and translating the address of a Direct Memory Access (DMA) device, configuring the address space of a Peripheral Command Indicator (PCI), debugging after combining the coreboot with the pmon as a new BIOS, and debugging the kernel interrupt system. With the method presented, it can solve the problem of the address mapping and translating between the Loongson CPU and the AMD bridge chip in a BIOS level, the problem of addressing the DMA device in the pmon, the reading and writing problem of PCI configuration space of a Loongson blade, the transplanting and debugging problem from the coreboot to pmon. The interrupt processing mode of the external device of the Loongsoon mainboard guarantees the regular works of the external device of the Loongsoon mainboard.