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-rw-r--r--include/configs/sbc8548.h14
1 files changed, 10 insertions, 4 deletions
diff --git a/include/configs/sbc8548.h b/include/configs/sbc8548.h
index 09245b5..d87394c 100644
--- a/include/configs/sbc8548.h
+++ b/include/configs/sbc8548.h
@@ -124,7 +124,9 @@
* A hardware errata caused the LBC SDRAM SPD and the DDR2 SPD
* to collide, meaning you couldn't reliably read either. So
* physically remove the LBC PC100 SDRAM module from the board
- * before enabling the two SPD options below.
+ * before enabling the two SPD options below, or check that you
+ * have the hardware fix on your board via "i2c probe" and looking
+ * for a device at 0x53.
*/
#undef CONFIG_SPD_EEPROM /* Use SPD EEPROM for DDR setup */
#undef CONFIG_DDR_SPD
@@ -140,8 +142,13 @@
#define CONFIG_DIMM_SLOTS_PER_CTLR 1
#define CONFIG_CHIP_SELECTS_PER_CTRL 2
-/* I2C addresses of SPD EEPROMs */
+/*
+ * The hardware fix for the I2C address collision puts the DDR
+ * SPD at 0x53, but if we are running on an older board w/o the
+ * fix, it will still be at 0x51. We check 0x53 1st.
+ */
#define SPD_EEPROM_ADDRESS 0x51 /* CTLR 0 DIMM 0 */
+#define ALT_SPD_EEPROM_ADDRESS 0x53 /* CTLR 0 DIMM 0 */
/*
* Make sure required options are set
@@ -293,11 +300,10 @@
* Note that most boards have a hardware errata where both the
* LBC SDRAM and the DDR2 SDRAM decode at 0x51, making it impossible
* to use CONFIG_DDR_SPD unless you physically remove the LBC DIMM.
+ * A hardware workaround is also available, see README.sbc8548 file.
*/
-#ifndef CONFIG_DDR_SPD
#define CONFIG_SYS_LBC_SDRAM_BASE 0xf0000000 /* Localbus SDRAM */
#define CONFIG_SYS_LBC_SDRAM_SIZE 128 /* LBC SDRAM is 128MB */
-#endif
/*
* Base Register 3 and Option Register 3 configure the 1st 1/2 SDRAM.