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>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/util.c b/arch/powerpc/cpu/mpc8xxx/ddr/util.c
index afc5fae..940ffff 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/util.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/util.c
@@ -121,6 +121,16 @@ void fsl_ddr_set_intl3r(const unsigned int granule_size)
 #endif
 }
 
+u32 fsl_ddr_get_intl3r(void)
+{
+	u32 val = 0;
+#ifdef CONFIG_E6500
+	u32 *mcintl3r = (void *) (CONFIG_SYS_IMMR + 0x18004);
+	val = *mcintl3r;
+#endif
+	return val;
+}
+
 void board_add_ram_info(int use_default)
 {
 #if defined(CONFIG_MPC83xx)