+#if defined(CONFIG_BOOT_PCI)
+ .section .bootpg,"ax"
+ .globl _start_pci
+/*******************************************
+ */
+
+_start_pci:
+ /* first handle errata #68 / PCI_18 */
+ iccci r0, r0 /* invalidate I-cache */
+ lis r31, 0
+ mticcr r31 /* ICCR = 0 (all uncachable) */
+ isync
+
+ mfccr0 r28 /* set CCR0[24] = 1 */
+ ori r28, r28, 0x0080
+ mtccr0 r28
+
+ /* setup PMM0MA (0xEF400004) and PMM0PCIHA (0xEF40000C) */
+ lis r28, 0xEF40
+ addi r28, r28, 0x0004
+ stw r31, 0x0C(r28) /* clear PMM0PCIHA */
+ lis r29, 0xFFF8 /* open 512 kByte */
+ addi r29, r29, 0x0001/* and enable this region */
+ stwbrx r29, r0, r28 /* write PMM0MA */
+
+ lis r28, 0xEEC0 /* address of PCIC0_CFGADDR */
+ addi r29, r28, 4 /* add 4 to r29 -> PCIC0_CFGDATA */
+
+ lis r31, 0x8000 /* set en bit bus 0 */
+ ori r31, r31, 0x304C/* device 6 func 0 reg 4C (XBCS register) */
+ stwbrx r31, r0, r28 /* write it */
+
+ lwbrx r31, r0, r29 /* load XBCS register */
+ oris r31, r31, 0x02C4/* clear BIOSCS WPE, set lower, extended and 1M extended BIOS enable */
+ stwbrx r31, r0, r29 /* write back XBCS register */
+
+ nop
+ nop
+ b _start /* normal start */
+#endif