芯片的型号：K9F2G08U0C
芯片大小：256M Byte记忆单元阵列：(256M + 8,192K)bit x 8bit
2048 blocks * 64 pages/block * 2048 bytes/page = [256M Bytes]
这个芯片的写操作是以页为单位的，擦除是以块为单位的.
擦出页面的起始地址以及偏移量应该是2048*64的整数倍.
问题:
jz2440不能成功地从nandflash读取文件系统, 使用的韦老大给的fs_mini_mdev.yaffs2.
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方法一:
0. 查看坏块,重新规划分区
用nfs启动后,使用mount挂载/dev/mtdblock3的时候打印的坏块信息:
nand bad block:
block 29 is bad
block 377 is bad
block 486 is bad
block 491 is bad
block 659 is bad
block 740 is bad
block 877 is bad
block 1412 is bad
block 1444 is bad
block 1539 is bad
block 1993 is bad
new root area: 我的想法是直接跨过坏块,在好的区域安排mtdblock3.
block 30 - 360
0x3C0000 -- 0x2D00000; size = 0x2940000; (测试用的root大小889bc0, 够用了)
1. 修改arch/arm/plat-s3c24xx/common-smdk.c
/* NAND parititon from 2.4.18-swl5 */
static struct mtd_partition smdk_default_nand_part[] = {
[0] = {
.name = "bootloader",
.size = 0x00040000,
.offset = 0,
},
[1] = {
.name = "params",
.offset = MTDPART_OFS_APPEND,
.size = 0x00020000,
},
[2] = {
.name = "kernel",
.offset = MTDPART_OFS_APPEND,
.size = 0x00200000,
},
[3] = {
.name = "root",
//直接跨过坏块,在好的区域安排mtdblock3.
.offset = 0x3C0000, //MTDPART_OFS_APPEND,
.size = 0x2940000, //MTDPART_SIZ_FULL,
}
};
2. 重新烧写, 设置从nand读取文件系统
{
tftp 30000000 fs_mini_mdev.yaffs2 ; nand erase root; //Bytes transferred = 8952768 (889bc0 hex)
nand write.yaffs2 30000000 0x3C0000 0x2940000;
set bootcmd tftp 0x30007fc0 uImage \;bootm 0x30007fc0;
set bootargs noinitrd root=/dev/mtdblock3 init=/linuxrc console=ttySAC0; save;
}
NOT GOOD
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jz2440不能成功地从nandflash读取文件系统, 使用韦老大给的fs_mini_mdev.yaffs2.
第二次尝试:
我猜想是不是不能跨过某些区域分块,因此考虑把kernel分区往后延伸.
0. 查看坏块, 重新规划
{这里奇怪的是算出来的坏块和mount打印的坏块不同}
NAND erase: device 0 offset 0x260000, size 0xfda0000
Skipping bad block at 0x005e0000 (block: 47 )
Skipping bad block at 0x03160000 (block: 395 )
Skipping bad block at 0x03f00000 (block: 504 )
Skipping bad block at 0x03fa0000 (block: 509 )
Skipping bad block at 0x054a0000 (block: 677 )
Skipping bad block at 0x05ec0000 (block: 758 )
Skipping bad block at 0x06fe0000 (block: 895 )
Skipping bad block at 0x0b2c0000 (block: 1430 )
Skipping bad block at 0x0b6c0000 (block: 1462 )
Skipping bad block at 0x0c2a0000 (block: 1557 )
Skipping bad block at 0x0fb60000 (block: 2011 )
Erasing at 0xffe0000 -- 100% complete.
{
new new root area:
block 3 - 47
0x00060000-0x005e0000 ; size = 0x580000;
new new root area:
block 47 - all
0x005e0000 -- all; size = all - 0x3C0000;
}
1. 修改arch/arm/plat-s3c24xx/common-smdk.c
/* NAND parititon from 2.4.18-swl5 */
static struct mtd_partition smdk_default_nand_part[] = {
[0] = {
.name = "bootloader",
.size = 0x00040000,
.offset = 0,
},
[1] = {
.name = "params",
.offset = MTDPART_OFS_APPEND,
.size = 0x00020000,
},
[2] = {
.name = "kernel",
.offset = MTDPART_OFS_APPEND,
.size = 0x580000,
},
[3] = {
.name = "root",
.offset = MTDPART_OFS_APPEND ,
.size = MTDPART_SIZ_FULL,
}
};
2. 重新烧写, 设置从nand读取文件系统
{
tftp 30000000 fs_mini_mdev.yaffs2 ; nand erase root; //Bytes transferred = 8952768 (889bc0 hex)
nand write.yaffs2 30000000 0x005e0000 0x8A0000;
set bootcmd tftp 0x30007fc0 uImage \;bootm 0x30007fc0;
set bootargs noinitrd root=/dev/mtdblock3 init=/linuxrc console=ttySAC0; save;
}
仍然不能正确启动:
{
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
end_request: I/O error, dev mtdblock3, sector 2
EXT3-fs: unable to read superblock
end_request: I/O error, dev mtdblock3, sector 0
Buffer I/O error on device mtdblock3, logical block 0
end_request: I/O error, dev mtdblock3, sector 0
Buffer I/O error on device mtdblock3, logical block 0
end_request: I/O error, dev mtdblock3, sector 8
Buffer I/O error on device mtdblock3, logical block 1
end_request: I/O error, dev mtdblock3, sector 8
Buffer I/O error on device mtdblock3, logical block 1
end_request: I/O error, dev mtdblock3, sector 16
Buffer I/O error on device mtdblock3, logical block 2
end_request: I/O error, dev mtdblock3, sector 16
Buffer I/O error on device mtdblock3, logical block 2
end_request: I/O error, dev mtdblock3, sector 24
Buffer I/O error on device mtdblock3, logical block 3
end_request: I/O error, dev mtdblock3, sector 24
Buffer I/O error on device mtdblock3, logical block 3
end_request: I/O error, dev mtdblock3, sector 0
FAT: unable to read boot sector
VFS: Cannot open root device "mtdblock3" or unknown-block(31,3)
Please append a correct "root=" boot option; here are the available partitions:
1f00 256 mtdblock0 (driver?)
1f01 128 mtdblock1 (driver?)
1f02 5632 mtdblock2 (driver?)
1f03 256128 mtdblock3 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,3)
}
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