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

Jerry Van Baren
2007-02-16T01:34:45Z

sai wrote:
>
> 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.
> --
> ***************************************
> Yongdae, Shin
> ***************************************

U-boot runs polled mode rather than using interrupts (with a couple of
exceptions). U-boot is single-threaded and simple (well, compared to
linux). The rationale is that, if you want an interrupt driven
multitasking system, run linux. ;-)

Best regards,
gvb