（一）mtd分区、时钟优化
1、修改include/configs/smdk2440.h
diff -urN u-boot-2016.11/include/configs/smdk2440.h u-boot-2016.11_s3c2440/include/configs/smdk2440.h
--- u-boot-2016.11/include/configs/smdk2440.h 2018-06-16 13:14:39.906908304 +0800
+++ u-boot-2016.11_s3c2440/include/configs/smdk2440.h 2018-06-16 13:18:11.188496279 +0800
@@ -114,6 +114,18 @@
#define CONFIG_LZO
#define CONFIG_LZMA
+#define CONFIG_BOOTARGS "console=ttySAC0,115200 noinitrd root=/dev/mtdblock3 init=/linuxrc"
+#define CONFIG_BOOTCOMMAND "nand read.jffs2 0x30007FC0 kernel; bootm 0x30007FC0"
+#define CONFIG_RAMBOOTCOMMAND "setenv bootargs noinitrd root=/dev/mtdblock3 " \
+ "init=/linuxrc console=ttySAC0,115200;" \
+ " nand read.jffs2 0x30007FC0 kernel; bootm 0x30007FC0"
+
+#define CONFIG_NFSBOOTCOMMAND "setenv bootargs console=ttySAC0,115200 root=/dev/nfs " \
+ "nfsroot=$serverip:/home/book/nfs/nfsroot " \
+ "ip=$ipaddr:$serverip:$gatewayip:$netmask::eth0:off init=/linuxrc; " \
+ "nfs 30000000 $serverip:/home/book/nfs/kernel/uImage; bootm 30000000"
+
+
/*-----------------------------------------------------------------------
* Physical Memory Map
*/
@@ -139,11 +151,17 @@
#define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
#define CONFIG_SYS_MAX_FLASH_SECT (128)
-#define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x070000)
-#define CONFIG_ENV_IS_IN_FLASH
-#define CONFIG_ENV_SIZE 0x10000
-/* allow to overwrite serial and ethaddr */
-#define CONFIG_ENV_OVERWRITE
+#define CONFIG_ENV_IS_IN_NAND
+#define CONFIG_ENV_OFFSET 0x00040000
+#define CONFIG_ENV_SIZE 0x00020000
+
+#define CONFIG_CMD_MTDPARTS
+#define CONFIG_MTD_DEVICE
+#define MTDIDS_DEFAULT "nand0=jz2440-0" /* 哪一个设备 */
+#define MTDPARTS_DEFAULT "mtdparts=jz2440-0:256k(u-boot)," \
+ "128k(params)," \
+ "2m(kernel)," \
+ "-(rootfs)" \
/*
* Size of malloc() pool2、修复之前存在时钟FCLK不是400MHZ的BUG，修改board/samsung/smdk2440/smdk2440.c
diff -urN u-boot-2016.11/board/samsung/smdk2440/smdk2440.c u-boot-2016.11_s3c2440/board/samsung/smdk2440/smdk2440.c
--- u-boot-2016.11/board/samsung/smdk2440/smdk2440.c 2018-06-16 13:14:39.906908304 +0800
+++ u-boot-2016.11_s3c2440/board/samsung/smdk2440/smdk2440.c 2018-06-16 13:17:40.605212280 +0800
@@ -58,11 +58,11 @@
struct s3c24x0_gpio * const gpio = s3c24x0_get_base_gpio();
/* to reduce PLL lock time, adjust the LOCKTIME register */
- writel(0xFFFFFF, &clk_power->locktime);
+ //writel(0xFFFFFF, &clk_power->locktime);
/* configure MPLL */
- writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,
- &clk_power->mpllcon);
+ //writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,
+ // &clk_power->mpllcon);
/* some delay between MPLL and UPLL */
pll_delay(4000);3、修改Kconfig
diff -urN u-boot-2016.11/Kconfig u-boot-2016.11_s3c2440/Kconfig
--- u-boot-2016.11/Kconfig 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/Kconfig 2018-06-16 13:19:35.538650278 +0800
@@ -23,10 +23,18 @@
any files with a filename matching localversion* in your
object and source tree, in that order. Your total string can
be a maximum of 64 characters.
+config COMPILE_TOOLS
+ bool "arm-linux-"
+ default y
+ help
+ select the compile tools
+ if you select the arm-linux- then the TOOLS is arm-linux-gcc
+ if you don't select it or select gcc
+ the compile tool will be gcc
config LOCALVERSION_AUTO
bool "Automatically append version information to the version string"
- default y
+ default n
help
This will try to automatically determine if the current tree is a
release tree by looking for Git tags that belong to the current4、修改Makefile
diff -urN u-boot-2016.11/Makefile u-boot-2016.11_s3c2440/Makefile
--- u-boot-2016.11/Makefile 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/Makefile 2018-06-16 13:22:16.314998278 +0800
@@ -2,6 +2,7 @@
# SPDX-License-Identifier: GPL-2.0+
#
+CROSS_COMPILE=arm-linux-
VERSION = 2016
PATCHLEVEL = 11
SUBLEVEL =5、修改auto_run.sh
diff -urN u-boot-2016.11/auto_run.sh u-boot-2016.11_s3c2440/auto_run.sh
--- u-boot-2016.11/auto_run.sh 2018-06-14 20:16:17.101187155 +0800
+++ u-boot-2016.11_s3c2440/auto_run.sh 2018-06-16 13:20:33.983858278 +0800
@@ -6,4 +6,4 @@
echo "Load Configuration File..."
make smdk2440_defconfig
echo "make..."
-make CROSS_COMPILE=arm-linux-
+make 6、烧写u-boot.bin到Nor Flash上启动
book@ubuntu:~/u-boot-2016.11$ ./auto_run.sh 
现在时钟频率为FCLK=400MHz，修复了之前我移植期间考虑不周的BUG，也可以保存环境变量和已经有mtd分区，以后烧写u-boot和kernel可以分别用：
nand erase.part u-boot;nand write 30000000 u-boot
nand erase.part kernel;nand write 30000000 kernel（二）优化u-boot网络下载文件
1、修改drivers/net/dm9000x.c，注释了宽带测速
diff -urN u-boot-2016.11/drivers/net/dm9000x.c u-boot-2016.11_s3c2440/drivers/net/dm9000x.c
--- u-boot-2016.11/drivers/net/dm9000x.c 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/drivers/net/dm9000x.c 2018-06-16 14:39:42.975420781 +0800
@@ -363,6 +363,7 @@
/* Enable TX/RX interrupt mask */
DM9000_iow(DM9000_IMR, IMR_PAR);
+#if 0
i = 0;
while (!(dm9000_phy_read(1) & 0x20)) { /* autonegation complete bit */
udelay(1000);
@@ -394,6 +395,8 @@
break;
}
printf("mode\n");
+#endif
+
return 0;
}
@@ -428,7 +431,7 @@
while ( !(DM9000_ior(DM9000_NSR) & (NSR_TX1END | NSR_TX2END)) ||
!(DM9000_ior(DM9000_ISR) & IMR_PTM) ) {
if (get_timer(0) >= tmo) {
- printf("transmission timeout\n");
+ debug("transmission timeout\n");
break;
}
}2、修改net/nfs.c
diff -urN u-boot-2016.11/net/nfs.c u-boot-2016.11_s3c2440/net/nfs.c
--- u-boot-2016.11/net/nfs.c 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/net/nfs.c 2018-06-16 14:39:27.555714780 +0800
@@ -37,7 +37,7 @@
#define HASHES_PER_LINE 65 /* Number of "loading" hashes per line */
#define NFS_RETRY_COUNT 30
#ifndef CONFIG_NFS_TIMEOUT
-# define NFS_TIMEOUT 2000UL
+# define NFS_TIMEOUT 10000UL
#else
# define NFS_TIMEOUT CONFIG_NFS_TIMEOUT
#endif
@@ -906,7 +906,7 @@
net_boot_file_expected_size_in_blocks << 9);
print_size(net_boot_file_expected_size_in_blocks << 9, "");
}
- debug("\nLoad address: 0x%lx\nLoading: *\b", load_addr);
+ printf("\nLoad address: 0x%lx\nLoading: *\b", load_addr);
net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
net_set_udp_handler(nfs_handler);3、烧写u-boot.bin到Nor Flash启动
此优化可以减少网络下载等待时间，大家可以自己测试下是否缩短了等待下载时间
（三）修改u-boot支持nand write.yaffs2命令
1、测试nand write.yaff或nand write.yaffs2
可见我们移植的u-boot命令里面没有nand write.yaff或nand write.yaff2命令
2、修改cmd/nand.c
diff -urN u-boot-2016.11/cmd/nand.c u-boot-2016.11_s3c2440/cmd/nand.c
--- u-boot-2016.11/cmd/nand.c 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/cmd/nand.c 2018-06-16 22:30:19.522035899 +0800
@@ -623,6 +623,16 @@
maxsize, (u_char *)addr,
WITH_DROP_FFS | WITH_WR_VERIFY);
#endif
+#ifdef CONFIG_CMD_NAND_YAFFS
+ } else if (!strcmp(s, ".yaffs2")) {
+ if (read) {
+ printf("Unknown nand command suffix ¡®%s¡®.\n", s);
+ return 1;
+ }
+ ret = nand_write_skip_bad(mtd, off, &rwsize,NULL,//ÕâÀï²ÎÊýºÍÀÏ°æ±ÈÒªÐÞ¸ÄÏÂ
+ maxsize,(u_char *)addr,
+ WITH_YAFFS_OOB);
+#endif
} else if (!strcmp(s, ".oob")) {
/* out-of-band data */
mtd_oob_ops_t ops = {
@@ -798,6 +808,11 @@
" 'addr', skipping bad blocks and dropping any pages at the end\n"
" of eraseblocks that contain only 0xFF\n"
#endif
+#ifdef CONFIG_CMD_NAND_YAFFS
+ "nand write.yaffs2 - addr off|partition size\n"
+ " write ¡®size¡® bytes starting at offset ¡®off¡® with yaffs format\n"
+ " from memory address ¡®addr¡®, skipping bad blocks.\n"
+#endif
"nand erase[.spread] [clean] off size - erase 'size' bytes "
"from offset 'off'\n"
" With '.spread', erase enough for given file size, otherwise,\n"3、修改include/nand.h
diff -urN u-boot-2016.11/include/nand.h u-boot-2016.11_s3c2440/include/nand.h
--- u-boot-2016.11/include/nand.h 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/include/nand.h 2018-06-16 22:30:38.798035899 +0800
@@ -27,6 +27,11 @@
#endif
#endif
+#ifdef CONFIG_CMD_NAND_YAFFS
+#define WITH_YAFFS_OOB (1 << 0)
+#define WITH_DROP_FFS (1 << 0)
+#endif
+
extern void nand_init(void);
#include <linux/compat.h>4、修改drivers/mtd/nand/nand_util.c
diff -urN u-boot-2016.11/drivers/mtd/nand/nand_util.c u-boot-2016.11_s3c2440/drivers/mtd/nand/nand_util.c
--- u-boot-2016.11/drivers/mtd/nand/nand_util.c 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/drivers/mtd/nand/nand_util.c 2018-06-16 22:31:15.710035899 +0800
@@ -581,7 +581,28 @@
if (actual)
*actual = 0;
- blocksize = mtd->erasesize;
+#ifdef CONFIG_CMD_NAND_YAFFS
+ if (flags & WITH_YAFFS_OOB)
+ {
+ if (flags & ~WITH_YAFFS_OOB)
+ return -EINVAL;
+
+ int pages;
+ pages = mtd->erasesize / mtd->writesize;
+ blocksize = (pages * mtd->oobsize) + mtd->erasesize;
+ if (*length % (mtd->writesize + mtd->oobsize))
+ {
+ printf ("Attempt to write incomplete page"
+ " in yaffs mode\n");
+ return -EINVAL;
+ }
+ }
+ else
+#endif
+ {
+ blocksize = mtd->erasesize;
+ }
+
/*
* nand_write() handles unaligned, partial page writes.
@@ -649,24 +670,53 @@
write_size = left_to_write;
else
write_size = blocksize - block_offset;
-
- truncated_write_size = write_size;
+#ifdef CONFIG_CMD_NAND_YAFFS
+ if (flags & WITH_YAFFS_OOB)
+ {
+ int page, pages;
+ size_t pagesize = mtd->writesize;
+ size_t pagesize_oob = pagesize + mtd->oobsize;
+ struct mtd_oob_ops ops;
+
+ ops.len = pagesize;
+ ops.ooblen = mtd->oobsize;
+ ops.mode = MTD_OPS_RAW; //ÕâÀïÒª¸ÄΪRAW
+ ops.ooboffs = 0;
+
+ pages = write_size / pagesize_oob;
+ for (page = 0; page < pages; page++)
+ {
+ WATCHDOG_RESET();
+
+ ops.datbuf = p_buffer;
+ ops.oobbuf = ops.datbuf + pagesize;
+
+ rval = mtd->_write_oob(mtd, offset, &ops);
+ if (rval != 0)
+ break;
+
+ offset += pagesize;
+ p_buffer += pagesize_oob;
+ }
+ }
+ else
+#endif
+ {
+ truncated_write_size = write_size;
#ifdef CONFIG_CMD_NAND_TRIMFFS
- if (flags & WITH_DROP_FFS)
- truncated_write_size = drop_ffs(mtd, p_buffer,
- &write_size);
+ if (flags & WITH_DROP_FFS)
+ truncated_write_size = drop_ffs(mtd, p_buffer,
+ &write_size);
#endif
+ rval = nand_write(mtd, offset, &truncated_write_size,
+ p_buffer);
- rval = nand_write(mtd, offset, &truncated_write_size,
- p_buffer);
-
- if ((flags & WITH_WR_VERIFY) && !rval)
- rval = nand_verify(mtd, offset,
- truncated_write_size, p_buffer);
-
- offset += write_size;
- p_buffer += write_size;
-
+ if ((flags & WITH_WR_VERIFY) && !rval)
+ rval = nand_verify(mtd, offset,
+ truncated_write_size, p_buffer);
+ offset += write_size;
+ p_buffer += write_size;
+ }
if (rval != 0) {
printf("NAND write to offset %llx failed %d\n",
offset, rval);5、修改include/configs/smdk2440.h
diff -urN u-boot-2016.11/include/configs/smdk2440.h u-boot-2016.11_s3c2440/include/configs/smdk2440.h
--- u-boot-2016.11/include/configs/smdk2440.h 2018-06-16 14:37:31.997964781 +0800
+++ u-boot-2016.11_s3c2440/include/configs/smdk2440.h 2018-06-16 22:30:06.282035899 +0800
@@ -155,6 +155,7 @@
#define CONFIG_ENV_OFFSET 0x00040000
#define CONFIG_ENV_SIZE 0x00020000
+#define CONFIG_CMD_NAND_YAFFS
#define CONFIG_CMD_MTDPARTS
#define CONFIG_MTD_DEVICE
#define MTDIDS_DEFAULT "nand0=jz2440-0" /* 是哪一个设备¸ */6、修改scripts/config_whitelist.txt
diff -urN u-boot-2016.11/scripts/config_whitelist.txt u-boot-2016.11_s3c2440/scripts/config_whitelist.txt
--- u-boot-2016.11/scripts/config_whitelist.txt 2018-06-16 13:14:39.926918304 +0800
+++ u-boot-2016.11_s3c2440/scripts/config_whitelist.txt 2018-06-16 22:31:57.646035899 +0800
@@ -611,6 +611,7 @@
CONFIG_CMD_NAND_LOCK_UNLOCK
CONFIG_CMD_NAND_TORTURE
CONFIG_CMD_NAND_TRIMFFS
+CONFIG_CMD_NAND_YAFFS
CONFIG_CMD_ONENAND
CONFIG_CMD_OTP
CONFIG_CMD_PART7、烧写u-boot.bin到Nor Flash上启动
book@ubuntu:~/u-boot-2016.11$ ./auto_run.sh 
