From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Roese <sr@denx.de>
Date: Sat, 23 Jul 2005 02:05:17 +0200
Subject: [U-Boot-Users] Interrupt initialization for ppc440
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Hi Shawn,

> IIRC, Interrupt usually doesn't have to be enabled on U-Boot. When
> looking into ppc440 code cpu/ppc4xx/interrupts.c, I noticed that
> uic0/1/2 are actually enabled for ppc440 targets. Is there any 440
> chips using interrupts on U-Boot?

Yes. All PPC4xx chips (405 and 440) use interrupts for the ethernet drivers. 
Try looking for "irq_install_handler" to see, where interrupts are used.

Best regards,
Stefan