tricorder: support 256MiB SDRAM on revision > D

Signed-off-by: Andreas Bießmann <andreas.biessmann@corscience.de>

board/corscience/tricorder/tricorder.c

@@ -154,12 +154,43 @@ int board_mmc_init(bd_t *bis)
  */
 void get_board_mem_timings(struct board_sdrc_timings *timings)
 {
+	struct tricorder_eeprom eeprom;
+	get_eeprom(&eeprom);
+
 	/* General SDRC config */
-	timings->mcfg = MICRON_V_MCFG_165(128 << 20);
-	timings->rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_165MHz;
+	if (eeprom.board_version[0] > 'D') {
+		/* use optimized timings for our SDRAM device */
+		timings->mcfg = MCFG((256 << 20), 14);
+#define MT46H64M32_TDAL  6	/* Twr/Tck + Trp/tck		*/
+				/* 15/6 + 18/6 = 5.5 -> 6	*/
+#define MT46H64M32_TDPL  3	/* 15/6 = 2.5 -> 3 (Twr)	*/
+#define MT46H64M32_TRRD  2	/* 12/6 = 2			*/
+#define MT46H64M32_TRCD  3	/* 18/6 = 3			*/
+#define MT46H64M32_TRP   3	/* 18/6 = 3			*/
+#define MT46H64M32_TRAS  7	/* 42/6 = 7			*/
+#define MT46H64M32_TRC  10	/* 60/6 = 10			*/
+#define MT46H64M32_TRFC 12	/* 72/6 = 12			*/
+		timings->ctrla = ACTIM_CTRLA(MT46H64M32_TRFC, MT46H64M32_TRC,
+					     MT46H64M32_TRAS, MT46H64M32_TRP,
+					     MT46H64M32_TRCD, MT46H64M32_TRRD,
+					     MT46H64M32_TDPL,
+					     MT46H64M32_TDAL);
+
+#define MT46H64M32_TWTR 1
+#define MT46H64M32_TCKE 1
+#define MT46H64M32_XSR 19	/* 112.5/6 = 18.75 => ~19	*/
+#define MT46H64M32_TXP 1
+		timings->ctrlb = ACTIM_CTRLB(MT46H64M32_TWTR, MT46H64M32_TCKE,
+					     MT46H64M32_TXP, MT46H64M32_XSR);
 
-	/* AC timings */
+		timings->mr = MICRON_V_MR_165;
+		timings->rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_165MHz;
+	} else {
+		/* use conservative beagleboard timings as default */
+		timings->mcfg = MICRON_V_MCFG_165(128 << 20);
 		timings->ctrla = MICRON_V_ACTIMA_165;
 		timings->ctrlb = MICRON_V_ACTIMB_165;
 		timings->mr = MICRON_V_MR_165;
+		timings->rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_165MHz;
+	}
 }

include/configs/tricorder.h

@@ -354,7 +354,7 @@
 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR 0x300 /* address 0x60000 */
 
 #define CONFIG_SPL_TEXT_BASE		0x40200000 /*CONFIG_SYS_SRAM_START*/
-#define CONFIG_SPL_MAX_SIZE		(55 * 1024)	/* 7 KB for stack */
+#define CONFIG_SPL_MAX_SIZE		(57 * 1024)	/* 7 KB for stack */
 #define CONFIG_SPL_STACK		LOW_LEVEL_SRAM_STACK
 
 #define CONFIG_SPL_BSS_START_ADDR	0x80000000 /*CONFIG_SYS_SDRAM_BASE*/