原创 nand boot的u-boot for sbc2410x

nand boot的u-boot for sbc2410x
by panasonic.lin@163.com
Nor flash启动的uboot比较简单，下面移植nand boot的u-boot：
第一步：让从nor flash启动的u-boot支持nand flash 的读写；
第二步：从nand启动；

 #########################################################################
 ######################################################################### 
第一步步骤：
1打开nand flash驱动的支持。
在include/configs/sbc2410x.h
 #define CONFIG_CMD_DHCP
 #define CONFIG_CMD_ELF
 #define CONFIG_CMD_PING
+#define CONFIG_CMD_NAND

#define CONFIG_BOOTDELAY    5
@@ -211,6 +211,39 @@
 #if defined(CONFIG_CMD_NAND)
 #define CONFIG_NAND_S3C2410
 #define CONFIG_SYS_MAX_NAND_DEVICE 1   /* Max number of NAND devices       */
+//#define S3C2410_NAND_BASE        0x4E000000
+#define CONFIG_SYS_NAND_BASE 0x4E000000
+
+#define SECTORSIZE 512
+
+#define ADDR_COLUMN 1
+#define ADDR_PAGE 2
+#define ADDR_COLUMN_PAGE 3
+
+#define NAND_ChipID_UNKNOWN 0x00
+#define NAND_MAX_FLOORS 1
+#define NAND_MAX_CHIPS 1
+
+#define NAND_WAIT_READY(nand) NF_WaitRB()
+
+#define NAND_DISABLE_CE(nand) NF_SetCE(NFCE_HIGH)
+#define NAND_ENABLE_CE(nand) NF_SetCE(NFCE_LOW)
+
+
+#define WRITE_NAND_COMMAND(d, adr) NF_Cmd(d)
+#define WRITE_NAND_COMMANDW(d, adr) NF_CmdW(d)
+#define WRITE_NAND_ADDRESS(d, adr) NF_Addr(d)
+#define WRITE_NAND(d, adr) NF_Write(d)
+#define READ_NAND(adr) NF_Read()
+/* the following functions are NOP's because S3C24X0 handles this in hardware */
+#define NAND_CTL_CLRALE(nandptr)
+#define NAND_CTL_SETALE(nandptr)
+#define NAND_CTL_CLRCLE(nandptr)
+#define NAND_CTL_SETCLE(nandptr)
+
+#define CONFIG_MTD_NAND_VERIFY_WRITE 1
+#define CONFIG_MTD_NAND_ECC_JFFS2 1
+
 #endif /* CONFIG_CMD_NAND */
 
 #define CONFIG_SETUP_MEMORY_TAGS

 #########################################################################
 ######################################################################### 
2：在/board/sbc2410x/sbc2410x.c
添加nand flash操作函数原型，注释掉nand_init是因为uboot支持的mtd驱动已经实现了这个函数，并且nand_probe需自己定义，uboot没有这个函数。
 #if defined(CONFIG_CMD_NAND)
+
+typedef enum {
+ NFCE_LOW,
+ NFCE_HIGH
+} NFCE_STATE;
+
+static inline void NF_Conf(u16 conf)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ nand->NFCONF = conf;
+}
+
+static inline void NF_Cmd(u8 cmd)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ nand->NFCMD = cmd;
+}
+
+static inline void NF_CmdW(u8 cmd)
+{
+ NF_Cmd(cmd);
+ udelay(1);
+}
+
+static inline void NF_Addr(u8 addr)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ nand->NFADDR = addr;
+}
+
+static inline void NF_SetCE(NFCE_STATE s)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ switch (s) {
+  case NFCE_LOW:
+   nand->NFCONF &= ~(1<<11);
+   break;
+
+  case NFCE_HIGH:
+   nand->NFCONF |= (1<<11);
+   break;
+ }
+}
+
+static inline void NF_WaitRB(void)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ while (!(nand->NFSTAT & (1<<0)));
+}
+
+static inline void NF_Write(u8 data)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ nand->NFDATA = data;
+}
+
+static inline u8 NF_Read(void)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ return(nand->NFDATA);
+}
+
+static inline void NF_Init_ECC(void)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ nand->NFCONF |= (1<<12);
+}
+
+static inline u32 NF_Read_ECC(void)
+{
+ struct s3c2410_nand * const nand = s3c2410_get_base_nand();
+
+ return(nand->NFECC);
+}
+
+#endif
+/* dongas - support nand driver - end */
+
+#if defined(CONFIG_CMD_NAND)
 extern ulong nand_probe(ulong physadr);
 
 static inline void NF_Reset(void)
@@ -168,7 +255,7 @@
 
    NF_Reset();
 }
-
+/*
 void nand_init(void)
 {
    struct s3c2410_nand * const nand = s3c2410_get_base_nand();
@@ -179,6 +266,7 @@
 #endif
    printf ("%4lu MB\n", nand_probe((ulong)nand) >> 20);
 }
+*/
 #endif
 
 #ifdef CONFIG_CMD_NET
 #########################################################################
 ######################################################################### 
3.重新make之后用h－jtag烧写到nor flash，重启板子
U-Boot 2009.11 ( 4??月 16 2010 - 16:43:35)                                                                           
                                                                                                                    
DRAM:  64 MB                                                                                                        
Flash:  2 MB                                                                                                        
NAND:  64 MiB                                                                                                       
env_relocate[252] malloced ENV at 33f512a0                                                                          
In:    serial                                                                                                       
Out:   serial                                                                                                        
Err:   serial                                                                                                       
Net:   CS8900-0                                                                                                      
Hit any key to stop autoboot:  0
[Panasonic@163.com ]# nand info
Device0:NAND64MiB3,3V8bit,sectorsize16KiB
也可以输入help nand获得nand子系统的帮助。
附上补丁patch
https://static.assets-stash.eet-china.com/album/old-resources/2010/4/19/d3a84b87-d2cc-4ff5-9e92-8969363d3c04.rar

#########################################################################
 ######################################################################### 
第二步：完全从nand boot。
这一步比较理解起来比较难，需要看很多资料，做起来却很简单。
1./include/configs/sbc2410x.h
@@ -183,35 +183,60 @@
 #ifdef CONFIG_AMD_LV160
 #define PHYS_FLASH_SIZE        0x00200000 /* 2MB */
 #define CONFIG_SYS_MAX_FLASH_SECT  (35)    /* max number of sectors on one chip */
-#define CONFIG_ENV_ADDR        (CONFIG_SYS_FLASH_BASE + 0x1F0000) /* addr of environment ,sector 35,1f0000-1fffff*/
+//#define CONFIG_ENV_ADDR      (CONFIG_SYS_FLASH_BASE + 0x1F0000) /* addr of environment ,sector 35,1f0000-1fffff*/
 注释掉CONFIG_ENV_ADDR
#endif
 
 /* timeout values are in ticks */
 #define CONFIG_SYS_FLASH_ERASE_TOUT    (5*CONFIG_SYS_HZ) /* Timeout for Flash Erase */
 #define CONFIG_SYS_FLASH_WRITE_TOUT    (5*CONFIG_SYS_HZ) /* Timeout for Flash Write */
 

+//#define  CONFIG_ENV_IS_IN_FLASH  1
+//#define CONFIG_ENV_SIZE      0x10000 /* Total Size of Environment Sector,64k */
+//#define CFG_ENV_IS_IN_FLASH 1 /* Environment is in Nor Flash */
+#define CONFIG_ENV_IS_IN_NAND 1 /* Environment is in Nand Flash */
+#define CONFIG_ENV_SIZE  0x4000 /* Total Size of Environment Sector */
+#define CONFIG_ENV_OFFSET  0X40000

 /*-----------------------------------------------------------------------
  * NAND flash settings
  */
-#if defined(CONFIG_CMD_NAND)
+/*
+ * Nandflash Boot
+ */
添加寄存器定义和偏移
+#define CONFIG_S3C2410_NAND_BOOT 1
+#define STACK_BASE 0x33f00000
+#define STACK_SIZE 0x8000
+#define UBOOT_RAM_BASE 0x33f80000 //define the position of uboot in the sdram
+
+/* NAND Flash Controller */ //copy from vivi
+
+#define NAND_CTL_BASE 0x4E000000
+#define bINT_CTL(Nb) __REG(INT_CTL_BASE + (Nb))
+/* Offset */
+#define oNFCONF 0x00
+#define oNFCMD 0x04
+#define oNFADDR 0x08
+#define oNFDATA 0x0c
+#define oNFSTAT 0x10
+#define oNFECC 0x14
+
+#ifdef CONFIG_CMD_NAND
 #define CONFIG_NAND_S3C2410
 #define CONFIG_SYS_MAX_NAND_DEVICE 1   /* Max number of NAND devices       */
-//#define S3C2410_NAND_BASE        0x4E000000
+
 #define CONFIG_SYS_NAND_BASE 0x4E000000
 
 #define SECTORSIZE 512

 #########################################################################
 ######################################################################### 
2.修改/cpu/arm920t/start.S
@@ -114,10 +114,10 @@
    orr r0, r0, #0xd3
    msr cpsr, r0
 
-   bl  coloured_LED_init
-   bl  red_LED_on
+   //bl    coloured_LED_init
+   //bl    red_LED_on
 
-#if    defined(CONFIG_AT91RM9200DK) || defined(CONFIG_AT91RM9200EK)
+#if    0//defined(CONFIG_AT91RM9200DK) || defined(CONFIG_AT91RM9200EK)
    /*
     * relocate exception table
     */
@@ -156,7 +156,7 @@
    ldr r0, =INTMSK
    str r1, [r0]
 # if defined(CONFIG_S3C2410)
-   ldr r1, =0x3ff
+   ldr r1, =0x7ff
    ldr r0, =INTSUBMSK
    str r1, [r0]
 # endif
@@ -176,6 +176,8 @@
    bl  cpu_init_crit
 #endif
 
注释掉relocat这一段代码
+#if 0
 #ifndef CONFIG_SKIP_RELOCATE_UBOOT
 relocate:              /* relocate U-Boot to RAM       */
    adr r0, _start      /* r0 <- current position of code   */
@@ -183,6 +185,8 @@
    cmp r0, r1          /* don't reloc during debug         */
    beq stack_setup
 
+
+
    ldr r2, _armboot_start
    ldr r3, _bss_start
    sub r2, r3, r2      /* r2 <- size of armboot            */
@@ -194,6 +198,79 @@
    cmp r0, r2          /* until source end addreee [r2]    */
    ble copy_loop
 #endif /* CONFIG_SKIP_RELOCATE_UBOOT */
+#endif
插入以下代码：
+#ifdef  CONFIG_S3C2410_NAND_BOOT
+@ reset NAND
+
+   mov r1, #NAND_CTL_BASE
+   ldr r2, =0xf830    @ initial value
+   str   r2, [r1, #oNFCONF]
+   ldr   r2, [r1, #oNFCONF]
+   bic   r2, r2, #0x800 @ enable chip
+   str   r2, [r1, #oNFCONF]
+   mov   r2, #0xff   @ RESET command
+   strb  r2, [r1, #oNFCMD]     
+
+   mov   r3, #0  @ wait
+
+nand1:
+
+   add     r3, r3, #0x1
+   cmp     r3, #0xa
+
+   blt     nand1
+
+nand2:
+
+   ldr     r2, [r1, #oNFSTAT]     @ wait ready
+   tst     r2, #0x1
+        beq     nand2      
+
+        ldr     r2, [r1, #oNFCONF]
+        orr     r2, r2, #0x800 @ disable chip
+        str     r2, [r1, #oNFCONF]
+
+        @ get read to call C functions (for nand_read())
+
+        ldr     sp, DW_STACK_START     @ setup stack pointer
+        mov     fp, #0  @ no previous frame, so fp="0"
+
+      
+
+        @ copy U-Boot to RAM
+        ldr     r0, =TEXT_BASE
+        mov     r1, #0x0      @start address
+        mov     r2, #0x30000  @code size
+        bl      nand_read_ll
+        tst     r0, #0x0
+        beq     ok_nand_read
+
+
+
+bad_nand_read:
+
+loop2:
+        b       loop2   @ infinite loop
+
+ok_nand_read:
+        @ verify
+        mov     r0, #0
+        ldr     r1, =TEXT_BASE
+        mov     r2, #0x400     @ 4 bytes * 1024 = 4K-bytes
+go_next:
+        ldr     r3, [r0], #4
+        ldr     r4, [r1], #4
+        teq     r3, r4
+        bne     notmatch
+        subs    r2, r2, #4
+        beq     stack_setup
+        bne     go_next
+
+notmatch:
+loop3:
+        b       loop3   @ infinite loop
+#endif
 
    /* Set up the stack保留了堆栈设置和清除bss这两段代码                           */
 stack_setup:
@@ -205,6 +282,7 @@
 #endif
    sub sp, r0, #12     /* leave 3 words for abort-stack    */
 
+
 clear_bss:
    ldr r0, _bss_start      /* find start of bss segment        */
    ldr r1, _bss_end        /* stop here                        */
@@ -215,11 +293,16 @@
    cmp r0, r1
    ble clbss_l
 
-   ldr pc, _start_armboot
 
-_start_armboot:    .word start_armboot
 
+   ldr pc, _start_armboot
 
+_start_armboot:    .word start_armboot
+#ifdef CONFIG_S3C2410_NAND_BOOT
+   .align  2
+DW_STACK_START:
+   .word STACK_BASE+STACK_SIZE-4
+#endif

 #########################################################################
 ######################################################################### 
3.  在/board/sbc2410x/
添加nand_read.c
@@ -0,0 +1,59 @@
+#include <config.h>
+
+#define __REGb(x) (*(volatile unsigned char *)(x))
+#define __REGi(x) (*(volatile unsigned int *)(x))
+#define NF_BASE 0x4e000000
+#define NFCONF __REGi(NF_BASE + 0x0)
+#define NFCMD __REGb(NF_BASE + 0x4)
+#define NFADDR __REGb(NF_BASE + 0x8)
+#define NFDATA __REGb(NF_BASE + 0xc)
+#define NFSTAT __REGb(NF_BASE + 0x10)
+
+#define BUSY 1
+inline void wait_idle(void) {
+    int i;
+
+    while(!(NFSTAT & BUSY))
+      for(i=0; i<10; i++);
+}
+
+#define NAND_SECTOR_SIZE 512
+#define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1)
+
+/* low level nand read function */
+int
+nand_read_ll(unsigned char *buf, unsigned long start_addr, int size)
+{
+    int i, j;
+
+    if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {
+        return -1; /* invalid alignment */
+    }
+
+    /* chip Enable */
+    NFCONF &= ~0x800;
+    for(i=0; i<10; i++);
+
+    for(i=start_addr; i < (start_addr + size);) {
+      /* READ0 */
+      NFCMD = 0;
+
+      /* Write Address */
+      NFADDR = i & 0xff;
+      NFADDR = (i >> 9) & 0xff;
+      NFADDR = (i >> 17) & 0xff;
+      NFADDR = (i >> 25) & 0xff;
+
+      wait_idle();
+
+      for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {
+ *buf = (NFDATA & 0xff);
+ buf++;
+      }
+    }
+
+    /* chip Disable */
+    NFCONF |= 0x800; /* chip disable */
+
+    return 0;
+}
 #########################################################################
 ######################################################################### 
/board/sbc2410x/Makefile
@@ -25,7 +25,7 @@
 
 LIB    = $(obj)lib$(BOARD).a
 
-COBJS  := sbc2410x.o flash.o
+COBJS  := sbc2410x.o flash.o nand_read.o
 SOBJS  := lowlevel_init.o
 
 SRCS   := $(SOBJS:.o=.S) $(COBJS:.o=.c)
 #########################################################################
 ######################################################################### 
/board/sbc2410x/flash.c 注释掉nor 的保护，因为环境变量保存在nand中了。
@@ -110,7 +110,7 @@
        }
        size += flash_info.size;
    }
-
+/*
    flash_protect (FLAG_PROTECT_SET,
               CONFIG_SYS_FLASH_BASE,
               CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
@@ -119,7 +119,7 @@
    flash_protect (FLAG_PROTECT_SET,
               CONFIG_ENV_ADDR,
               CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);
-
+*/
    return size;
 }
  #########################################################################
 ######################################################################### 
最后，新版uboot的makefile变化了这里，结果导致start.S的nand拷贝自己代码排在了4k空间以后，启动不了。
 ./u-boot-2009-11-sbc2410x-nand-boot/Makefile
@@ -291,7 +291,7 @@
 endif
 
 __OBJS := $(subst $(obj),,$(OBJS))
-__LIBS := $(subst $(obj),,$(LIBS)) $(subst $(obj),,$(LIBBOARD))
+__LIBS := $(subst $(obj),,$(LIBBOARD)) $(subst $(obj),,$(LIBS))
 
 #########################################################################
 #########################################################################
make后生成u-boot.bin,拷贝到tftp输出文件夹。
启动nor中的uboot
[Panasonic@163.com ]# tftp 30000000 u-boot-nand-boot.bin                                                            
Using CS8900-0 device                                                                                                
TFTP from server 192.168.0.1; our IP address is 192.168.0.2                                                         
Filename 'u-boot-nand-boot.bin'.                                                                                     
Load address: 0x30000000                                                                                            
Loading: ###########                                                                                                
done                                                                                                                 
Bytes transferred = 151016 (24de8 hex)                                                                              
[Panasonic@163.com ]# nand erase 0 42000                                                                            
                                                                                                                    
NAND erase: device 0 offset 0x0, size 0x42000                                                                        
Erasing at 0x210000 -- 262144% complete.                                                                            
OK                                                                                                                   
[Panasonic@163.com ]# nand write 30000000 0 42000                                                                   
                                                                                                                     
NAND write: device 0 offset 0x0, size 0x42000                                                                       
 270336 bytes written: OK
 #########################################################################
 #########################################################################
最后跳线从nand启动
U-Boot 2009.11 ( 4??月 19 2010 - 14:25:22)                                                                          
                                                                                                                     
DRAM:  64 MB                                                                                                        
Flash:  2 MB                                                                                                         
NAND:  64 MiB                                                                                                       
env_relocate[252] malloced ENV at 33f5d2a0                                                                           
*** Warning - bad CRC or NAND, using default environment                                                            
                                                                                                                    
In:    serial                                                                                                       
Out:   serial                                                                                                       
Err:   serial                                                                                                        
Net:   CS8900-0                                                                                                     
Hit any key to stop autoboot:  0                                                                                     
[Panasonic@163.com ]# nand info                                                                                     
                                                                                                                     
Device 0: NAND 64MiB 3,3V 8-bit, sector size 16 KiB                                                                 
                                                                                   
[Panasonic@163.com ]# saveenv                                                                                       
Saving Environment to NAND...                                                                                       
Erasing Nand...                                                                                                      
Erasing at 0x4 -- 262144% complete.                                                                                 
Writing to Nand... done                                                                                              

附上patch
https://static.assets-stash.eet-china.com/album/old-resources/2010/4/19/7e9ff743-40a1-4359-8c13-78a444d540d3.rar