ppc4xx: Add NAND booting support for AMCC Bamboo (440EP) eval board

This patch adds NAND booting support for the AMCC Bamboo eval board.
Since the NAND-SPL boot image is limited to 4kbytes, this version
only supports the onboard 64MBytes of DDR. The DIMM modules can't be
supported, since the setup code for I2C DIMM autodetection and
configuration is too big for this NAND bootloader.

Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 76 insertions, 12 deletions

diff --git a/include/configs/bamboo.h b/include/configs/bamboo.h
index db58a9f..763d1c7 100644
--- a/include/configs/bamboo.h
+++ b/include/configs/bamboo.h
@@ -50,7 +50,7 @@
  *----------------------------------------------------------------------*/
 #define CFG_MONITOR_LEN		(384 * 1024)	/* Reserve 384 kB for Monitor	*/
 #define CFG_MALLOC_LEN		(256 * 1024)	/* Reserve 256 kB for malloc()	*/
-#define CFG_MONITOR_BASE	(-CFG_MONITOR_LEN)
+#define CFG_MONITOR_BASE	TEXT_BASE
 #define CFG_SDRAM_BASE	        0x00000000	    /* _must_ be 0	*/
 #define CFG_FLASH_BASE	        0xfff00000	    /* start of FLASH	*/
 #define CFG_PCI_MEMBASE	        0xa0000000	    /* mapped pci memory*/
@@ -104,14 +104,11 @@
 /*-----------------------------------------------------------------------
  * Environment
  *----------------------------------------------------------------------*/
-/*
- * Define here the location of the environment variables (FLASH or EEPROM).
- * Note: DENX encourages to use redundant environment in FLASH.
- */
-#if 1
+#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
 #define CFG_ENV_IS_IN_FLASH     1	/* use FLASH for environment vars	*/
 #else
-#define CFG_ENV_IS_IN_EEPROM	1	/* use EEPROM for environment vars	*/
+#define CFG_ENV_IS_IN_NAND	1	/* use NAND for environment vars	*/
+#define CFG_ENV_IS_EMBEDDED	1	/* use embedded environment */
 #endif
 
 /*-----------------------------------------------------------------------
@@ -133,7 +130,7 @@
 
 #ifdef CFG_ENV_IS_IN_FLASH
 #define CFG_ENV_SECT_SIZE	0x10000 	/* size of one complete sector	*/
-#define CFG_ENV_ADDR		(CFG_MONITOR_BASE-CFG_ENV_SECT_SIZE)
+#define CFG_ENV_ADDR		((-CFG_MONITOR_LEN)-CFG_ENV_SECT_SIZE)
 #define	CFG_ENV_SIZE		0x2000	/* Total Size of Environment Sector	*/
 
 /* Address and size of Redundant Environment Sector	*/
@@ -141,22 +138,89 @@
 #define CFG_ENV_SIZE_REDUND	(CFG_ENV_SIZE)
 #endif /* CFG_ENV_IS_IN_FLASH */
 
+/*
+ * IPL (Initial Program Loader, integrated inside CPU)
+ * Will load first 4k from NAND (SPL) into cache and execute it from there.
+ *
+ * SPL (Secondary Program Loader)
+ * Will load special U-Boot version (NUB) from NAND and execute it. This SPL
+ * has to fit into 4kByte. It sets up the CPU and configures the SDRAM
+ * controller and the NAND controller so that the special U-Boot image can be
+ * loaded from NAND to SDRAM.
+ *
+ * NUB (NAND U-Boot)
+ * This NAND U-Boot (NUB) is a special U-Boot version which can be started
+ * from RAM. Therefore it mustn't (re-)configure the SDRAM controller.
+ *
+ * On 440EPx the SPL is copied to SDRAM before the NAND controller is
+ * set up. While still running from cache, I experienced problems accessing
+ * the NAND controller.	sr - 2006-08-25
+ */
+#define CFG_NAND_BOOT_SPL_SRC	0xfffff000	/* SPL location			*/
+#define CFG_NAND_BOOT_SPL_SIZE	(4 << 10)	/* SPL size			*/
+#define CFG_NAND_BOOT_SPL_DST	0x00800000	/* Copy SPL here		*/
+#define CFG_NAND_U_BOOT_DST	0x01000000	/* Load NUB to this addr	*/
+#define CFG_NAND_U_BOOT_START	CFG_NAND_U_BOOT_DST /* Start NUB from this addr	*/
+#define CFG_NAND_BOOT_SPL_DELTA	(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)
+
+/*
+ * Define the partitioning of the NAND chip (only RAM U-Boot is needed here)
+ */
+#define CFG_NAND_U_BOOT_OFFS	(16 << 10)	/* Offset to RAM U-Boot image	*/
+#define CFG_NAND_U_BOOT_SIZE	(384 << 10)	/* Size of RAM U-Boot image	*/
+
+/*
+ * Now the NAND chip has to be defined (no autodetection used!)
+ */
+#define CFG_NAND_PAGE_SIZE	512		/* NAND chip page size		*/
+#define CFG_NAND_BLOCK_SIZE	(16 << 10)	/* NAND chip block size		*/
+#define CFG_NAND_PAGE_COUNT	32		/* NAND chip page count		*/
+#define CFG_NAND_BAD_BLOCK_POS	5		/* Location of bad block marker	*/
+#define CFG_NAND_4_ADDR_CYCLE	1		/* Fourth addr used (>32MB)	*/
+
+#define CFG_NAND_ECCSIZE	256
+#define CFG_NAND_ECCBYTES	3
+#define CFG_NAND_ECCSTEPS	(CFG_NAND_PAGE_SIZE / CFG_NAND_ECCSIZE)
+#define CFG_NAND_OOBSIZE	16
+#define CFG_NAND_ECCTOTAL	(CFG_NAND_ECCBYTES * CFG_NAND_ECCSTEPS)
+#define CFG_NAND_ECCPOS		{0, 1, 2, 3, 6, 7}
+
+#ifdef CFG_ENV_IS_IN_NAND
+/*
+ * For NAND booting the environment is embedded in the U-Boot image. Please take
+ * look at the file board/amcc/sequoia/u-boot-nand.lds for details.
+ */
+#define CFG_ENV_SIZE		CFG_NAND_BLOCK_SIZE
+#define CFG_ENV_OFFSET		(CFG_NAND_U_BOOT_OFFS + CFG_ENV_SIZE)
+#define CFG_ENV_OFFSET_REDUND	(CFG_ENV_OFFSET + CFG_ENV_SIZE)
+#endif
+
 /*-----------------------------------------------------------------------
  * NAND FLASH
  *----------------------------------------------------------------------*/
-#define CFG_MAX_NAND_DEVICE	1
-#define NAND_MAX_CHIPS		1
-#define CFG_NAND_CS		1
+#define CFG_MAX_NAND_DEVICE	2
+#define NAND_MAX_CHIPS		CFG_MAX_NAND_DEVICE
 #define CFG_NAND_BASE		(CFG_NAND_ADDR + CFG_NAND_CS)
+#define CFG_NAND_BASE_LIST	{ CFG_NAND_BASE, CFG_NAND_ADDR + 2 }
 #define CFG_NAND_SELECT_DEVICE  1	/* nand driver supports mutipl. chips	*/
 
+#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
+#define CFG_NAND_CS		1
+#else
+#define CFG_NAND_CS		0		/* NAND chip connected to CSx	*/
+/* Memory Bank 0 (NAND-FLASH) initialization					*/
+#define CFG_EBC_PB0AP		0x018003c0
+#define CFG_EBC_PB0CR		(CFG_NAND_ADDR | 0x1c000)
+#endif
+
 /*-----------------------------------------------------------------------
  * DDR SDRAM
  *----------------------------------------------------------------------------- */
 #define CONFIG_SPD_EEPROM               /* Use SPD EEPROM for setup             */
 #undef CONFIG_DDR_ECC			/* don't use ECC			*/
 #define CFG_SIMULATE_SPD_EEPROM	0xff	/* simulate spd eeprom on this address	*/
-#define SPD_EEPROM_ADDRESS      {CFG_SIMULATE_SPD_EEPROM, 0x50, 0x51}
+#define SPD_EEPROM_ADDRESS	{CFG_SIMULATE_SPD_EEPROM, 0x50, 0x51}
+#define CFG_MBYTES_SDRAM	(64)	/* 64MB fixed size for early-sdram-init */
 
 /*-----------------------------------------------------------------------
  * I2C