diff -uNr linux-2.4.paul/arch/ppc/kernel/head.S linux/arch/ppc/kernel/head.S
--- linux-2.4.paul/arch/ppc/kernel/head.S	Sun Aug 27 12:33:12 2000
+++ linux/arch/ppc/kernel/head.S	Sat Sep  2 11:26:12 2000
@@ -1347,13 +1347,17 @@
 4:
 	cror	14,14,18
 	bne	3,6f
-	/* We should add ABE here if we want to use Store Gathering
-	 * and other nifty bridge features
+	/* for G3/G4:
+	 * enable Store Gathering (SGE), Address Brodcast (ABE),
+	 * Branch History Table (BHTE), Branch Target ICache (BTIC)
 	 */
-	ori	r11,r11,HID0_SGE|HID0_BHTE|HID0_BTIC /* for g3/g4, enable */
+	ori	r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC
+	oris	r11,r11,HID0_DPM>>16	/* enable dynamic power mgmt */
+	li	r3,HID0_SPD
+	andc	r11,r11,r3		/* clear SPD: enable speculative */
  	li	r3,0
- 	mtspr	ICTC,r3
-5:	mtspr	HID0,r11		/* superscalar exec & br history tbl */
+ 	mtspr	ICTC,r3			/* Instruction Cache Throttling off */
+5:	mtspr	HID0,r11
 6:	blr

 /*