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标题: 对128M nand flash添加新的分区，不成功. [打印本页]

作者: pxebxp 时间: 2010-06-23 09:59
标题: 对128M nand flash添加新的分区，不成功.
环境说明：嵌入式linux 2.6.18
问题：对128M nand flash添加新的分区，不成功。我目前的做法是: 修改分区表，然后在启动脚本加mount /dev/mtdblock-x  /mnt/x, 其他的没改动，这样的做法对吗，见以下分析.

//老的nand flash 分区
static struct mtd_partition nand_partitions[] = {
/* bootloader (UBL, U-Boot, BBT) in sectors: 0 - 14 */
{
.name = "bootloader",
.offset = 0,
.size = 32 * NAND_BLOCK_SIZE,
.mask_flags = MTD_WRITEABLE, /* force read-only */
},
/* bootloader params in the next sector 15 */
{
.name = "params",
.offset = MTDPART_OFS_APPEND,
.size = 96 * NAND_BLOCK_SIZE,
.mask_flags = MTD_WRITEABLE, /* force read-only */
},
/* kernel in sectors: 16 */
{
.name = "kernel",
.offset = MTDPART_OFS_APPEND,
.size = SZ_2M,
.mask_flags = 0
},
{
.name = "filesystem1",
.offset = MTDPART_OFS_APPEND,
.size = SZ_16M + SZ_8M,
.mask_flags = 0
},
{
.name = "filesystem2",
.offset = MTDPART_OFS_APPEND,
.size = MTDPART_SIZ_FULL,
.mask_flags = 0
}
};

//新的nand flash 分区
static struct mtd_partition nand_partitions[] = {
/* 0 bootloader (UBL, U-Boot, BBT) in sectors: 0 - 14 */
{
.name = "bootloader",
.offset = 0,
.size = 32 * NAND_BLOCK_SIZE, //NAND_BLOCK_SIZE=(SZ_16K)
.mask_flags = MTD_WRITEABLE, /* force read-only */
},
/* 1 bootloader params in the next sector 15 */
{
.name = "params",
.offset = MTDPART_OFS_APPEND,
.size = 96 * NAND_BLOCK_SIZE, //96 * 16 = 1536K = 1.5M
.mask_flags = MTD_WRITEABLE, /* force read-only */
},
/* 2 kernel in sectors: 16 */
{
.name = "kernel",
.offset = MTDPART_OFS_APPEND,
.size = SZ_2M,
.mask_flags = 0
},
/* 3 */
{
.name = "filesystem1",
.offset = MTDPART_OFS_APPEND,
.size = SZ_16M + SZ_8M,
.mask_flags = 0
},
/* 4 add for jffs2 up. */
{
.name = "jffs2up",
.offset = MTDPART_OFS_APPEND,
.size = SZ_16M,
.mask_flags = 0
},
/* 5 add for jffs2 param. */
{
.name = "jffs2parm",
.offset = MTDPART_OFS_APPEND,
.size = SZ_16M,
.mask_flags = 0
},
/* 6 */
{
.name = "filesystem4",
.offset = MTDPART_OFS_APPEND,
.size = MTDPART_SIZ_FULL,
.mask_flags = 0
}
};

重新uImage
#make uImage

重新做文件系统，主要改动rcS:
原来只挂一个分区是：mount -t jffs2 /dev/mtdblock4 /mnt/nand，对应老的nand flash 分区（表）。
现在改成，对应新的分区（表）：
mount -t jffs2 /dev/mtdblock4 /mnt/firmware
mount -t jffs2 /dev/mtdblock5 /mnt/nand
其他的未改动。

进入U-BOOT打印环境变量如下：
my board>printenv
bootdelay=4
baudrate=115200
bootfile="uImage"
setboot=setenv bootargs $(bootargs)
stdin=serial
stdout=serial
stderr=serial
ver=U-Boot 1.3.4
filesize=C32000
fileaddr=82000000
gatewayip=192.168.2.1
netmask=255.255.255.0
ipaddr=192.168.1.92
serverip=192.168.1.101
bootcmd=nand read 0x82000000 0x400000 0xBF0000;nboot 0x80700000 0 0x200000;bootm 0x80700000
ethaddr=00:0C:8D:AD:0D:6C
bootargs=mem=56M console=ttyS1,115200n8 root=/dev/ram0 rw initrd=0x82000000,13M ip=dhcp eth=$(ethaddr)

Environment size: 553/16380 bytes
my board>

系统启动过程就提示错误：
nand_boar nand_boar.0: Using 4-bit hardware ECC
NAND device: Manufacturer ID: 0xec, Chip ID: 0x75 (Samsung NAND 32MiB 3,3V 8-bit)
Creating 7 MTD partitions on "nand_boar.0":
0x00000000-0x00080000 : "bootloader"
0x00080000-0x00200000 : "params"
0x00200000-0x00400000 : "kernel"
0x00400000-0x01c00000 : "filesystem1"
0x01c00000-0x02c00000 : "jffs2up"
mtd: partition "jffs2up" extends beyond the end of device "nand_boar.0" -- size truncated to 0x400000
0x02c00000-0x03c00000 : "jffs2parm"
mtd: partition "jffs2parm" is out of reach -- disabled
0x03c00000-0x02000000 : "filesystem4"
mtd: partition "filesystem4" is out of reach -- disabled
nand_boar nand_boar.0: hardware revision: 2.3

而老的分区的正常启动过程如下：
NAND device: Manufacturer ID: 0xec, Chip ID: 0x75 (Samsung NAND 32MiB 3,3V 8-bit)
Creating 5 MTD partitions on "nand_davinci.0":
0x00000000-0x00080000 : "bootloader"
0x00080000-0x00200000 : "params"
0x00200000-0x00400000 : "kernel"
0x00400000-0x01c00000 : "filesystem1"
0x01c00000-0x02000000 : "filesystem2"
nand_boar nand_boar.0: hardware revision: 2.3

新分区系统起来后，一个新的分区都未挂上。
# mount
rootfs on / type rootfs (rw)
/dev/root on / type cramfs (ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
tmpfs on /tmp type tmpfs (rw,sync)
/dev/root on /dev/.static/dev type cramfs (ro)
tmpfs on /dev type tmpfs (rw)
devpts on /dev/pts type devpts (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /dev/shm type tmpfs (rw)
none on /var/run type tmpfs (rw)
none on /tmp type tmpfs (rw,sync)
/dev/sbulla on /mnt/ramdisk type vfat (rw,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1)
# cat /proc/mtd
dev: size erasesize  name
mtd0: 00080000 00004000 "bootloader"
mtd1: 00180000 00004000 "params"
mtd2: 00200000 00004000 "kernel"
mtd3: 01800000 00004000 "filesystem1"
mtd4: 00400000 00004000 "jffs2up"
mtd5: 00000000 00004000 "jffs2parm"
mtd6: 00000000 00004000 "filesystem4"
# cat /proc/partitions
major minor  #blocks  name

  31    0       512 mtdblock0
  31    1    1536 mtdblock1
  31    2    2048 mtdblock2
  31    3    24576 mtdblock3
  31    4    4096 mtdblock4
254    0       512 sbulla
#

作者: myforever 时间: 2010-06-24 20:24
分区之间不能有重叠

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