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2 - 1 
TEXT	tas(SB), $0
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	SYNC
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	MOVW	R3, R4
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	MOVW	$0xdeaddead,R5
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tas1:
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	DCBF	(R4)	/* fix for 603x bug */
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	LWAR	(R4), R3
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	CMP	R3, $0
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	BNE	tas0
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	DCBT	(R4)				/* fix 405 errata cpu_210 */
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	STWCCC	R5, (R4)
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	BNE	tas1
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tas0:
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	SYNC
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	ISYNC
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	RETURN