关于 imx6q NANDflash mtd分区修改

只看该作者 · 2014-5-31 17:44

首先，我们需要更大一点的根目录，以存放应用程序；目前我们的根目录只有198M,(nand flash为4G);如下：

我修改的地方为 /drivers/mtd/mtdpart.c,如下图，因为打印信息上显示"nand_rootfs"大小为256M，所以我
直接判断 256 M，然后改为 512M

启动时打印显示已经改过来了：

但是启动时却起不来了！如下红色字体

Bus freq driver Enabled

mxc_dvfs_core_probe

DVFS driver module loaded

snvs_rtc snvs_rtc.0: setting system clock to 1970-01-01 00:00:00 UTC (0)

VFS: Cannot open root device "ubi0:rootfs" or unknown-block(0,0)

Please append a correct "root=" boot option; here are the available partitions:

1f00 1024 mtdblock0 (driver?)

1f01 1024 mtdblock1 (driver?)

1f02 16384 mtdblock2 (driver?)

1f03 16384 mtdblock3 (driver?)

1f04 524288 mtdblock4 (driver?)

1f05 3637248 mtdblock5 (driver?)

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

[<800464ac>] (unwind_backtrace+0x0/0xf8) from [<8044661c>] (panic+0x74/0x18c)

[<8044661c>] (panic+0x74/0x18c) from [<80008d8c>] (mount_block_root+0x170/0x224)

[<80008d8c>] (mount_block_root+0x170/0x224) from [<80008fd4>] (prepare_namespace+0x8c/0x184)

[<80008fd4>] (prepare_namespace+0x8c/0x184) from [<80008a54>] (kernel_init+0x108/0x13c)

[<80008a54>] (kernel_init+0x108/0x13c) from [<80040a18>] (kernel_thread_exit+0x0/0x8)

CPU3: stopping

[<800464ac>] (unwind_backtrace+0x0/0xf8) from [<8003a294>] (do_IPI+0x150/0x17c)

[<8003a294>] (do_IPI+0x150/0x17c) from [<8003f9cc>] (__irq_svc+0x4c/0xc4)

Exception stack(0xbffa3e10 to 0xbffa3e58)

3e00: 7fffffff bffbc000 00000000 00000000

3e20: bffa3ec4 bffa3ec0 7fffffff bffa2000 00000000 00000000 00000002 bffa3e94

3e40: 80038e40 bffa3e58 8044aba0 8044a6ac 60000013 ffffffff

[<8003f9cc>] (__irq_svc+0x4c/0xc4) from [<8044a6ac>] (wait_for_common+0xac/0x150)

[<8044a6ac>] (wait_for_common+0xac/0x150) from [<8031fcd0>] (mmc_wait_for_req_done+0x1c/0x5c)

[<8031fcd0>] (mmc_wait_for_req_done+0x1c/0x5c) from [<8031fdd8>] (mmc_wait_for_cmd+0x7c/0x9c)

[<8031fdd8>] (mmc_wait_for_cmd+0x7c/0x9c) from [<803246d4>] (mmc_send_op_cond+0xa0/0x100)

[<803246d4>] (mmc_send_op_cond+0xa0/0x100) from [<80323d64>] (mmc_attach_mmc+0x34/0x1b8)

[<80323d64>] (mmc_attach_mmc+0x34/0x1b8) from [<803217fc>] (mmc_rescan+0x22c/0x25c)

[<803217fc>] (mmc_rescan+0x22c/0x25c) from [<80087d88>] (process_one_work+0x10c/0x38c)

[<80087d88>] (process_one_work+0x10c/0x38c) from [<800885c0>] (worker_thread+0x170/0x37c)

[<800885c0>] (worker_thread+0x170/0x37c) from [<8008ca60>] (kthread+0x80/0x88)

[<8008ca60>] (kthread+0x80/0x88) from [<80040a18>] (kernel_thread_exit+0x0/0x8)

CPU1: stopping

[<800464ac>] (unwind_backtrace+0x0/0xf8) from [<8003a294>] (do_IPI+0x150/0x17c)

[<8003a294>] (do_IPI+0x150/0x17c) from [<8003f9cc>] (__irq_svc+0x4c/0xc4)

Exception stack(0xbffadf90 to 0xbffadfd8)

df80: 00000001 00000002 0002fe62 f40c4000

dfa0: bffac000 805fc184 805c3a70 8044f018 805c6de4 412fc09a 00000000 00000000

................略....................

请问我该怎么办呢？求救！！

只看该作者 · 2014-6-10 11:51

好吧！自己顶一下，问题已解决，mfg工具烧写时得两个uboot！

只看该作者 · 2014-6-19 09:35

顶楼主分享解决之道

只看该作者 · 2014-7-2 11:19

就是他这个 MFG 有两个uboot，一个是给MFG用的，一个是给板子用的，两个uboot的参数得一致

只看该作者 · 2014-7-2 11:23

但是我将分区改大了之后发现启动不太稳定了，启动偶尔会出现类似如下的错误，待解决

Bus freq driver Enabled
mxc_dvfs_core_probe
DVFS driver module loaded
snvs_rtc snvs_rtc.0: setting system clock to 1970-01-01 00:00:00 UTC (0)
VFS: Cannot open root device "ubi0:rootfs" or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00          1024 mtdblock0  (driver?)
1f01          1024 mtdblock1  (driver?)
1f02          16384 mtdblock2  (driver?)
1f03          16384 mtdblock3  (driver?)
1f04       524288 mtdblock4  (driver?)
1f05       3637248 mtdblock5  (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[<800464ac>] (unwind_backtrace+0x0/0xf8) from [<8044661c>] (panic+0x74/0x18c)
[<8044661c>] (panic+0x74/0x18c) from [<80008d8c>] (mount_block_root+0x170/0x224)
[<80008d8c>] (mount_block_root+0x170/0x224) from [<80008fd4>] (prepare_namespace+0x8c/0x184)
[<80008fd4>] (prepare_namespace+0x8c/0x184) from [<80008a54>] (kernel_init+0x108/0x13c)
[<80008a54>] (kernel_init+0x108/0x13c) from [<80040a18>] (kernel_thread_exit+0x0/0x8)
CPU3: stopping
[<800464ac>] (unwind_backtrace+0x0/0xf8) from [<8003a294>] (do_IPI+0x150/0x17c)
[<8003a294>] (do_IPI+0x150/0x17c) from [<8003f9cc>] (__irq_svc+0x4c/0xc4)
Exception stack(0xbffa3e10 to 0xbffa3e58)
3e00:                                  7fffffff bffbc000 00000000 00000000
3e20: bffa3ec4 bffa3ec0 7fffffff bffa2000 00000000 00000000 00000002 bffa3e94
3e40: 80038e40 bffa3e58 8044aba0 8044a6ac 60000013 ffffffff

1万 · 2014-7-2 12:06

不错学习一下

只看该作者 · 2014-7-7 11:03

记得Freescale针对IMX系列有相应的MFGTools工具使用，
在这个工具下有config文件，里面有一个mksdcard.sh脚本大体看了一下，就是使用fdisk对目标Flash进行分区，
你在这里调整一个分区大小即可。
附上我的参数：
#!/bin/sh

#edited by zhangshaoyan,2012/12/25
#uboot:10MB
#root:1GB-uboot
#user:4GB-uboot-root

# destroy the partition table
node=$1
dd if=/dev/zero of=${node} bs=1024 count=1
# call sfdisk to create partition table
sfdisk --force -uM ${node} << EOF
10,1024,83
1025,,83
EOF