[U-Boot] [PATCH v3 3/3] arm: omap3: Add SPL support to cm_t35

[Stefan Roese]

Add SPL U-Boot support to replace x-loader on the Compulab cm_t35
board. Currently only the 256MiB SDRAM board versions are supported.

Tested by booting via MMC and NAND.

Signed-off-by: Stefan Roese <sr at denx.de>
Cc: Tom Rini <trini at ti.com>
Cc: Igor Grinberg <grinberg at compulab.co.il>
---
v3:
- Some instability of this SDRAM setup has been detected while running
  Linux. Comparison with the x-loader setup showed that mcfg is configured
  slightly differently here. CM_T35 needs RAS-width of 14 instead of
  13. So use the define MICRON_V_MCFG_200 which implements this 14
  as RAS width.

v2:
- Change CONFIG_SYS_TEXT_BASE back to 0x80008000 for x-loader
  compatibility
- Change CONFIG_SPL_BSS_START_ADDR to 0x80100000 to not overlap
  with TEXT_BASE now
  
 board/compulab/cm_t35/cm_t35.c | 18 +++++++++++-
 include/configs/cm_t35.h       | 64 ++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 79 insertions(+), 3 deletions(-)

diff --git a/board/compulab/cm_t35/cm_t35.c b/board/compulab/cm_t35/cm_t35.c
index 3caa5be..c3d064c 100644
--- a/board/compulab/cm_t35/cm_t35.c
+++ b/board/compulab/cm_t35/cm_t35.c
@@ -105,6 +105,22 @@ static inline int splash_load_from_nand(void)
 }
 #endif /* CONFIG_CMD_NAND */
 
+#ifdef CONFIG_SPL_BUILD
+/*
+ * Routine: get_board_mem_timings
+ * Description: If we use SPL then there is no x-loader nor config header
+ * so we have to setup the DDR timings ourself on both banks.
+ */
+void get_board_mem_timings(struct board_sdrc_timings *timings)
+{
+	timings->mr = MICRON_V_MR_165;
+	timings->mcfg = MICRON_V_MCFG_200(256 << 20); /* raswidth 14 needed */
+	timings->ctrla = MICRON_V_ACTIMA_165;
+	timings->ctrlb = MICRON_V_ACTIMB_165;
+	timings->rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_165MHz;
+}
+#endif
+
 int splash_screen_prepare(void)
 {
 	char *env_splashimage_value;
@@ -428,7 +444,7 @@ void set_muxconf_regs(void)
 		cm_t3730_set_muxconf();
 }
 
-#ifdef CONFIG_GENERIC_MMC
+#if defined(CONFIG_GENERIC_MMC) && !defined(CONFIG_SPL_BUILD)
 int board_mmc_getcd(struct mmc *mmc)
 {
 	u8 val;
diff --git a/include/configs/cm_t35.h b/include/configs/cm_t35.h
index 39a216e..1eb57ba 100644
--- a/include/configs/cm_t35.h
+++ b/include/configs/cm_t35.h
@@ -25,8 +25,6 @@
 #define CONFIG_OMAP_GPIO
 #define CONFIG_CM_T3X	/* working with CM-T35 and CM-T3730 */
 
-#define CONFIG_SYS_TEXT_BASE	0x80008000
-
 #define CONFIG_SDRC	/* The chip has SDRC controller */
 
 #include <asm/arch/cpu.h>		/* get chip and board defs */
@@ -325,4 +323,66 @@
 #define CONFIG_CMD_BMP
 #define CONFIG_BMP_16BPP
 
+/* Defines for SPL */
+#define CONFIG_SPL
+#define CONFIG_SPL_FRAMEWORK
+#define CONFIG_SPL_NAND_SIMPLE
+
+#define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR	0x300 /* address 0x60000 */
+#define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS	0x200 /* 256 KB */
+#define CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION	1
+#define CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME	"u-boot.img"
+
+#define CONFIG_SPL_BOARD_INIT
+#define CONFIG_SPL_LIBCOMMON_SUPPORT
+#define CONFIG_SPL_LIBDISK_SUPPORT
+#define CONFIG_SPL_I2C_SUPPORT
+#define CONFIG_SPL_LIBGENERIC_SUPPORT
+#define CONFIG_SPL_MMC_SUPPORT
+#define CONFIG_SPL_FAT_SUPPORT
+#define CONFIG_SPL_SERIAL_SUPPORT
+#define CONFIG_SPL_NAND_SUPPORT
+#define CONFIG_SPL_NAND_BASE
+#define CONFIG_SPL_NAND_DRIVERS
+#define CONFIG_SPL_NAND_ECC
+#define CONFIG_SPL_GPIO_SUPPORT
+#define CONFIG_SPL_POWER_SUPPORT
+#define CONFIG_SPL_OMAP3_ID_NAND
+#define CONFIG_SPL_LDSCRIPT		"$(CPUDIR)/omap-common/u-boot-spl.lds"
+
+/* NAND boot config */
+#define CONFIG_SYS_NAND_5_ADDR_CYCLE
+#define CONFIG_SYS_NAND_PAGE_COUNT	64
+#define CONFIG_SYS_NAND_PAGE_SIZE	2048
+#define CONFIG_SYS_NAND_OOBSIZE		64
+#define CONFIG_SYS_NAND_BLOCK_SIZE	(128 * 1024)
+#define CONFIG_SYS_NAND_BAD_BLOCK_POS	NAND_LARGE_BADBLOCK_POS
+/*
+ * Use the ECC/OOB layout from omap_gpmc.h that matches your chip:
+ * SP vs LP, 8bit vs 16bit: GPMC_NAND_HW_ECC_LAYOUT
+ */
+#define CONFIG_SYS_NAND_ECCPOS		{ 1, 2, 3, 4, 5, 6, 7, 8, 9, \
+					 10, 11, 12 }
+#define CONFIG_SYS_NAND_ECCSIZE		512
+#define CONFIG_SYS_NAND_ECCBYTES	3
+
+#define CONFIG_SYS_NAND_U_BOOT_START	CONFIG_SYS_TEXT_BASE
+#define CONFIG_SYS_NAND_U_BOOT_OFFS	0x80000
+
+#define CONFIG_SPL_TEXT_BASE		0x40200800
+#define CONFIG_SPL_MAX_SIZE		(54 * 1024)	/* 8 KB for stack */
+#define CONFIG_SPL_STACK		LOW_LEVEL_SRAM_STACK
+
+/*
+ * Use 0x80008000 as TEXT_BASE here for compatibility reasons with the
+ * older x-loader implementations. And move the BSS area so that it
+ * doesn't overlap with TEXT_BASE.
+ */
+#define CONFIG_SYS_TEXT_BASE		0x80008000
+#define CONFIG_SPL_BSS_START_ADDR	0x80100000
+#define CONFIG_SPL_BSS_MAX_SIZE		0x80000		/* 512 KB */
+
+#define CONFIG_SYS_SPL_MALLOC_START	0x80208000
+#define CONFIG_SYS_SPL_MALLOC_SIZE	0x100000
+
 #endif /* __CONFIG_H */
-- 
1.8.3.4