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-rw-r--r--cpu/ppc4xx/44x_spd_ddr2.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/cpu/ppc4xx/44x_spd_ddr2.c b/cpu/ppc4xx/44x_spd_ddr2.c
index aa4a530..5214918 100644
--- a/cpu/ppc4xx/44x_spd_ddr2.c
+++ b/cpu/ppc4xx/44x_spd_ddr2.c
@@ -3083,6 +3083,16 @@ static void ppc440sp_sdram_register_dump(void)
*---------------------------------------------------------------------------*/
long initdram(int board_type)
{
+ /*
+ * Only run this SDRAM init code once. For NAND booting
+ * targets like Kilauea, we call initdram() early from the
+ * 4k NAND booting image (CONFIG_NAND_SPL) from nand_boot().
+ * Later on the NAND U-Boot image runs (CONFIG_NAND_U_BOOT)
+ * which calls initdram() again. This time the controller
+ * mustn't be reconfigured again since we're already running
+ * from SDRAM.
+ */
+#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
unsigned long val;
/* Set Memory Bank Configuration Registers */
@@ -3178,6 +3188,7 @@ long initdram(int board_type)
#if defined(CONFIG_DDR_ECC)
ecc_init(CFG_SDRAM_BASE, CFG_MBYTES_SDRAM << 20);
#endif /* defined(CONFIG_DDR_ECC) */
+#endif /* !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) */
return (CFG_MBYTES_SDRAM << 20);
}