[U-Boot-Users] About interrupt processing on MIPS32 4Kc

I am using Broadcom BCM7401 platform of MIPS32 4Kc bases.

This time, I decided to do u-boot porting.

In the midst of analyze source code, found out to u-boot's code for MIPS32 4Kc that interrupt processing part does not exist.

Why do not handle interrupt processing in u-boot of MIPS32 4Kc bases?

Could not find exception vector processing part.

relocate_code() exception vector thing which do relocation by memory be?

Basically, do not you use interrupt in u-boot of MIPS32 4Kc bases?

How do you treat devices(UART, Etherent,..) back differing without interrupt?

Are you doing polling?

I wonder very.