[U-Boot-Users] start.S for mpc85xx and debug via BDI2000

[Armand Ciejak <armand.ciejak@free.fr>]

I'm having problem in debugging U-boot for a MPC8540 processor.
I'm debugging the very first instructions with the BDI2000. The system 
crash at 2 places in start.S:

1- when clearing debug registers
2- when setting up interrupt vectors

	/* clear registers */
	li	r0,0
	mtspr	SRR0,r0
	mtspr	SRR1,r0
	mtspr	CSRR0,r0
	mtspr	CSRR1,r0
	mtspr	MCSRR0,r0
	mtspr	MCSRR1,r0

	mtspr	ESR,r0
	mtspr	MCSR,r0
	mtspr	DEAR,r0

HERE ->	mtspr	DBCR0,r0
	mtspr	DBCR1,r0
	mtspr	DBCR2,r0
	mtspr	IAC1,r0
	mtspr	IAC2,r0
	mtspr	DAC1,r0
	mtspr	DAC2,r0

	mfspr	r1,DBSR
	mtspr	DBSR,r1		/* Clear all valid bits */

	mtspr	PID0,r0
	mtspr	PID1,r0
	mtspr	PID2,r0
	mtspr	TCR,r0

	mtspr	BUCSR,r0	/* disable branch prediction */
	mtspr   MAS4,r0
	mtspr   MAS6,r0
	isync

	/* Setup interrupt vectors */
HERE ->	lis     r1,0xfff8
	mtspr IVPR, r1

	li      r1,0x0100
	mtspr	IVOR0,r1	/* 0: Critical input */
	li      r1,0x0200
	mtspr	IVOR1,r1	/* 1: Machine check */
	li      r1,0x0300
	mtspr	IVOR2,r1	/* 2: Data storage */
	li      r1,0x0400
	mtspr	IVOR3,r1	/* 3: Instruction storage */
	li	r1,0x0500
	mtspr	IVOR4,r1	/* 4: External interrupt */
	li	r1,0x0600
	mtspr	IVOR5,r1	/* 5: Alignment */
	li	r1,0x0700
	mtspr	IVOR6,r1	/* 6: Program check */
	li	r1,0x0800
	mtspr	IVOR7,r1	/* 7: floating point unavailable */
	li	r1,0x0c00
	mtspr	IVOR8,r1	/* 8: System call */
	/* 9: Auxiliary processor unavailable(unsupported) */
	li	r1,0x1000
	mtspr	IVOR10,r1	/* 10: Decrementer */
	li	r1,0x1400
	mtspr	IVOR13,r1	/* 13: Data TLB error */
	li	r1,0x1300
	mtspr	IVOR14,r1	/* 14: Instruction TLB error */
	li	r1,0x2000
	mtspr	IVOR15,r1	/* 15: Debug */

What should I do to be able to debug this part?