powerpc/mpc85xx: software workaround for DDR erratum A-004468
Boot space translation utilizes the pre-translation address to select
the DDR controller target. However, the post-translation address will be
presented to the selected DDR controller. It is possible that the pre-
translation address selects one DDR controller but the post-translation
address exists in a different DDR controller when using certain DDR
controller interleaving modes. The device may fail to boot under these
circumstances. Note that a DDR MSE error will not be detected since DDR
controller bounds registers are programmed to be the same when configured
for DDR controller interleaving.
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/arch/powerpc/cpu/mpc86xx/mp.c b/arch/powerpc/cpu/mpc86xx/mp.c
index 30c99eb..de705f0 100644
--- a/arch/powerpc/cpu/mpc86xx/mp.c
+++ b/arch/powerpc/cpu/mpc86xx/mp.c
@@ -90,8 +90,11 @@
return 1;
}
-u32 determine_mp_bootpg(void)
+u32 determine_mp_bootpg(unsigned int *pagesize)
{
+ if (pagesize)
+ *pagesize = 4096;
+
/* if we have 4G or more of memory, put the boot page at 4Gb-1M */
if ((u64)gd->ram_size > 0xfffff000)
return (0xfff00000);
@@ -101,7 +104,7 @@
void cpu_mp_lmb_reserve(struct lmb *lmb)
{
- u32 bootpg = determine_mp_bootpg();
+ u32 bootpg = determine_mp_bootpg(NULL);
/* tell u-boot we stole a page */
lmb_reserve(lmb, bootpg, 4096);
@@ -115,7 +118,7 @@
{
extern ulong __secondary_start_page;
ulong fixup = (ulong)&__secondary_start_page;
- u32 bootpg = determine_mp_bootpg();
+ u32 bootpg = determine_mp_bootpg(NULL);
u32 bootpg_va;
if (bootpg >= CONFIG_SYS_MAX_DDR_BAT_SIZE) {