1#include "ppc_asm.h" 2 3 .text 4 .global _zimage_start 5_zimage_start: 6 7 /* PPC errata 213: needed by Virtex-4 FX */ 8 mfccr0 0 9 oris 0,0,0x50000000@h 10 mtccr0 0 11 12 /* 13 * Invalidate the data cache if the data cache is turned off. 14 * - The 405 core does not invalidate the data cache on power-up 15 * or reset but does turn off the data cache. We cannot assume 16 * that the cache contents are valid. 17 * - If the data cache is turned on this must have been done by 18 * a bootloader and we assume that the cache contents are 19 * valid. 20 */ 21 mfdccr r9 22 cmplwi r9,0 23 bne 2f 24 lis r9,0 25 li r8,256 26 mtctr r8 271: dccci r0,r9 28 addi r9,r9,0x20 29 bdnz 1b 302: b _zimage_start_lib 31