added cache initialization code

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1522 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/arch/ppc/init/crt0.S.lb

@@ -32,6 +32,21 @@ system_reset:
 
 #if USE_DCACHE_RAM == 1
 #define DCACHE_RAM_END	(DCACHE_RAM_BASE + DCACHE_RAM_SIZE - 1)
+	/*
+	 * Initialize data cache blocks 
+	 * (assumes cache block size of 32 bytes)
+	 *
+	 * NOTE: This may need to be moved to FAMILY_INIT if
+	 *       dcbz is not supported on all CPU's
+	 */
+	lis     r1, DCACHE_RAM_BASE@h
+	ori     r1, r1, DCACHE_RAM_BASE@l
+	li      r3, (DCACHE_RAM_SIZE / 32)
+	mtctr   r3
+0:      dcbz    r0, r1
+	addi    r1, r1, 32
+	bdnz    0b
+
 	/*
 	 * Set up stack in cache. The SP must be 16-byte (4-word) aligned
 	 * for SYSV EABI or 8-byte (2-word) aligned for PPC EABI, so we make