85xx: Improve flash remapping on MPC8572DS & MPC8536DS
Changing the flash from cacheable to cache-inhibited was taking a significant
amount of time due to the fact that we were iterating over the full 256M of
flash. Instead we can just flush the L1 d-cache and invalidate the i-cache.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/freescale/mpc8536ds/mpc8536ds.c b/board/freescale/mpc8536ds/mpc8536ds.c
index f634e17..5b252d1 100644
--- a/board/freescale/mpc8536ds/mpc8536ds.c
+++ b/board/freescale/mpc8536ds/mpc8536ds.c
@@ -25,6 +25,7 @@
#include <pci.h>
#include <asm/processor.h>
#include <asm/mmu.h>
+#include <asm/cache.h>
#include <asm/immap_85xx.h>
#include <asm/immap_fsl_pci.h>
#include <asm/fsl_ddr_sdram.h>
@@ -441,7 +442,6 @@
int board_early_init_r(void)
{
- unsigned int i;
const unsigned int flashbase = CONFIG_SYS_FLASH_BASE;
const u8 flash_esel = 1;
@@ -450,11 +450,9 @@
* so that flash can be erased properly.
*/
- /* Invalidate any remaining lines of the flash from caches. */
- for (i = 0; i < 256*1024*1024; i+=32) {
- asm volatile ("dcbi %0,%1": : "b" (flashbase), "r" (i));
- asm volatile ("icbi %0,%1": : "b" (flashbase), "r" (i));
- }
+ /* Flush d-cache and invalidate i-cache of any FLASH data */
+ flush_dcache();
+ invalidate_icache();
/* invalidate existing TLB entry for flash + promjet */
disable_tlb(flash_esel);