HI
I want to mount root file system from flash. so i build the kernel with mtd
map driver from the list.
wehn i boot the system i got the log messege as
Physmaped_flash: Found 1 x16 devices at 0x0 in 16-bit bank
Amd/Fujitsu Extended Query Table at 0x0040
Using buffer write method
Physmaped_flash: CFI does not contain boot bank location.
Assuming top.
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code
brokenness.
0 partition parsing origin
in else add-partitions
Creating 4 MTD partitions on "Physmaped_flash":
0x00000000-0x00040000 : "bootloader"
mtd: Giving out device 0 to bootloader
0x00040000-0x00050000 : "params"
mtd: Giving out device 1 to params
0x00050000-0x00250000 : "kernel"
mtd: Giving out device 2 to kernel
0x00250000-0x01000000 : "filesystem"
mtd: Giving out device 3 to filesystem
I downloaded th MTD utilities mtd-utils-1.0.0m from
http://www.linux-mtd.infradead.org/index.html.
Build th mkfs.jffs2 utility as
make mkfs.jffs2
then build the root fs image as
mkfs.jffs2 -d root_folder
-o rootfs_image.jffs2 -e 0x10000
Then i copied the root fs image to flash from u-boot to address
0x02250000.
I supplied the boot arguments to kernel as
bootargs=console=ttyS0,115200n8 root=/dev/mtdblock3 rw
noinitrd ip=dhcp rootfstype=jffs2.
when i boot the system i got the following error.
IP-Config: Complete:
device=eth0, addr=10.1.11.166, mask=255.255.255.0, gw=10.1.11.76,
host=10.1.11.166, domain=, nis-domain=(none),
bootserver=10.1.11.76, rootserver=10.1.11.76, rootpath=
mtdblock_open
ok
mtdblock: read on "filesystem" at 0x400, size 0x200
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1]
Modules linked in:
CPU: 0
PC is at __wake_up_common+0x28/0x7c
LR is at 0x0
pc : [<c0037248>] lr : [<00000000>] Not tainted
sp : c6e6be70 ip : c6e6be9c fp : c6e6be98
r10: 00000006 r9 : 00000000 r8 : 00000000
r7 : c6e6a000 r6 : c0615a94 r5 : 60000013 r4 : 00000001
r3 : 00000000 r2 : 00000001 r1 : 00000006 r0 : c0615a94
Flags: nzcv IRQs off FIQs on Mode SVC_32 Segment kernel
Control: 5317F Table: 80004000 DAC: 00000017
Process mtdblockd (pid: 704, stack limit = 0xc6e6a198)
Stack: (0xc6e6be70 to 0xc6e6c000)
be60: c6e6a000 60000013 c061fe28
c6e6a000
be80: c0615a78 00000000 00000200 c6e6beb4 c6e6be9c c00372dc c0037230
00000000
bea0: 00250400 c0615a40 c6e6bedc c6e6beb8 c01af500 c00372ac c0615a40
00250400
bec0: c0615a40 00000000 c6e6a000 c061fe28 c6e6bf28 c6e6bee0 c01af91c
c01af3ac
bee0: c0615a40 00250400 00250400 00000000 c0615a78 c0615a40 00000200
60000013
bf00: c0619800 00000400 00000000 c6e6bf6c c6fa3400 00000400 00010000
c6e6bf5c
bf20: c6e6bf2c c01a6f10 c01af6cc c6e6bf6c c6fa3400 c6e6bf40 c003bd78
00000200
bf40: 00000400 c71ae3e0 c6fa3400 c0619000 c6e6bf98 c6e6bf60 c01ab1f8
c01a6e74
bf60: c6e6bf6c c6fa3400 00000200 00000000 00000002 00000002 c6e6a000
c6fa3400
bf80: c6e6122c c6e6f120 c02b253c c6e6bff4 c6e6bf9c c01ab93c c01ab114
c6e6f130
bfa0: c061c8e0 00000000 c05eb300 c0037200 00000000 00000000 00000000
c05eb300
bfc0: c0037200 00000000 00000000 00000000 00000000 00000000 00000000
00000000
bfe0: 00000000 00000000 00000000 c6e6bff8 c003d63c c01ab700 1c002217
40054e74
Backtrace:
[<c0037220>] (__wake_up_common+0x0/0x7c) from [<c00372dc>]
(__wake_up+0x40/0x64)
[<c003729c>] (__wake_up+0x0/0x64) from [<c01af500>] (put_chip+0x164/0x16c)
[<c01af39c>] (put_chip+0x0/0x16c) from [<c01af91c>]
(cfi_amdstd_read+0x260/0x2d0)
[<c01af6bc>] (cfi_amdstd_read+0x0/0x2d0) from [<c01a6f10>]
(part_read+0xac/0xe0)
[<c01a6e64>] (part_read+0x0/0xe0) from [<c01ab1f8>]
(mtdblock_readsect+0xf4/0x138)
[<c01ab104>] (mtdblock_readsect+0x0/0x138) from [<c01ab93c>]
(mtd_blktrans_thread+0x24c/0x354)
[<c01ab6f0>] (mtd_blktrans_thread+0x0/0x354) from [<c003d63c>]
(do_exit+0x0/0xdc0)
Code: e1a0a001 e1a04002 e1a08003 e59b9004 (e59e7000)
<6>note: mtdblockd[704] exited with preempt_count 2
BUG: scheduling while atomic: mtdblockd/0x00000002/704
caller is do_exit+0xd5c/0xdc0
i can't find the reason.
has any one done this. If so is this the correct way.
Thanking you.
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