* Patch by Jon Loeliger, Kumar Gala, 2005-02-08
For MPC85xxCDS:
Adds Relaxed Timing TRLX bit to FLASH ORx regs to allow
for faster flash parts.
Add documentation for BR/OR for FLASH.
diff --git a/include/configs/MPC8541CDS.h b/include/configs/MPC8541CDS.h
index cf15b88..3ec27b8 100644
--- a/include/configs/MPC8541CDS.h
+++ b/include/configs/MPC8541CDS.h
@@ -95,18 +95,50 @@
#error ("CONFIG_SPD_EEPROM is required by MPC85555CDS")
#endif
+#undef CONFIG_CLOCKS_IN_MHZ
+
+
/*
- * SDRAM on the Local Bus
+ * Local Bus Definitions
*/
-#define CFG_LBC_SDRAM_BASE 0xf0000000 /* Localbus SDRAM */
-#define CFG_LBC_SDRAM_SIZE 64 /* LBC SDRAM is 64MB */
+
+/*
+ * FLASH on the Local Bus
+ * Two banks, 8M each, using the CFI driver.
+ * Boot from BR0/OR0 bank at 0xff00_0000
+ * Alternate BR1/OR1 bank at 0xff80_0000
+ *
+ * BR0, BR1:
+ * Base address 0 = 0xff00_0000 = BR0[0:16] = 1111 1111 0000 0000 0
+ * Base address 1 = 0xff80_0000 = BR1[0:16] = 1111 1111 1000 0000 0
+ * Port Size = 16 bits = BRx[19:20] = 10
+ * Use GPCM = BRx[24:26] = 000
+ * Valid = BRx[31] = 1
+ *
+ * 0 4 8 12 16 20 24 28
+ * 1111 1111 1000 0000 0001 0000 0000 0001 = ff801001 BR0
+ * 1111 1111 0000 0000 0001 0000 0000 0001 = ff001001 BR1
+ *
+ * OR0, OR1:
+ * Addr Mask = 8M = ORx[0:16] = 1111 1111 1000 0000 0
+ * Reserved ORx[17:18] = 11, confusion here?
+ * CSNT = ORx[20] = 1
+ * ACS = half cycle delay = ORx[21:22] = 11
+ * SCY = 6 = ORx[24:27] = 0110
+ * TRLX = use relaxed timing = ORx[29] = 1
+ * EAD = use external address latch delay = OR[31] = 1
+ *
+ * 0 4 8 12 16 20 24 28
+ * 1111 1111 1000 0000 0110 1110 0110 0101 = ff806e65 ORx
+ */
+
#define CFG_FLASH_BASE 0xff000000 /* start of FLASH 8M */
-#define CFG_BR0_PRELIM 0xff801001 /* port size 16bit */
-#define CFG_BR1_PRELIM 0xff001001 /* port size 16bit */
+#define CFG_BR0_PRELIM 0xff801001
+#define CFG_BR1_PRELIM 0xff001001
-#define CFG_OR0_PRELIM 0xff806e61 /* 8MB Flash */
-#define CFG_OR1_PRELIM 0xff806e61 /* 8MB Flash */
+#define CFG_OR0_PRELIM 0xff806e65
+#define CFG_OR1_PRELIM 0xff806e65
#define CFG_FLASH_BANKS_LIST {0xff800000, CFG_FLASH_BASE}
#define CFG_MAX_FLASH_BANKS 2 /* number of banks */
@@ -121,11 +153,12 @@
#define CFG_FLASH_CFI
#define CFG_FLASH_EMPTY_INFO
-#undef CONFIG_CLOCKS_IN_MHZ
/*
- * Local Bus Definitions
+ * SDRAM on the Local Bus
*/
+#define CFG_LBC_SDRAM_BASE 0xf0000000 /* Localbus SDRAM */
+#define CFG_LBC_SDRAM_SIZE 64 /* LBC SDRAM is 64MB */
/*
* Base Register 2 and Option Register 2 configure SDRAM.