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about vpss event or interrupt

hi,

i want to use bsc in video stablization on dm365 board.from vpfe user guide(SPRUFG8B),it is said that:

on page120

IRQ0 (IPIPE_INT_REG) is issued when the IPIPE register update is allowed.
IRQ1 (IPIPE_INT_LAST_PIX) is issued when the last pixel of a frame comes into IPIPE.
IRQ2 (IPIPE_INT_DMA) is issued when the boxcar SDRAM transfer is done. On this timing, IPIPE_EOF is
sent to BL.
IRQ3 (IPIPE_INT_BSC) is issued when the boundary signal calculation is done.
IRQ4 (IPIPE_INT_HST) is issued when the histogram is done.
The interrupts IPIPE_INT_REG and IPIPE_INT_LAST_PIX are issued at the beginning and the end of the
valid data area.

on page 451,table6-303

set INTSEL3 bit 28-24 to 7 for enabling IPIPE_INT_BSC irq

on page 455,it is said:

set EVTSEL3 bit 28-24 to 7 for enabling IPIPE_INT_BSC event

i am in choas,i don't know which interrupt is for bsc,irq3 or 7.which one ,event or interrupt , is for bsc hardware?

More,i read dm365_vs_userguide.pdf,it's said that

Tie one of the four VPSS hardware events to BSC so that when
BSC module completes outputting BSC data to the memory, an
EDMA event is triggered to copy the BSC data into the user
specified buffer.

it told me bsc should use event,not interrupt.I am in troubling.

And i read some code slice from appro ipnc,the bsc irq is 5 on request_irq function.

crazy bsc!!!

anyone could give me a lead.

how to do it: 

Tie one of the four VPSS hardware events to BSC so that when
BSC module completes outputting BSC data to the memory, an
EDMA event is triggered to copy the BSC data into the user
specified buffer.

my god,help me!