Mohammed,
Are you using NFS to boot, then mounting to /mnt/flash? This is a good
test, but I just want to be sure it is what you are doing.
Can you post the output from:
# cat /proc/mtd
Also, you need to check and verify that the data in the flash matches
your file. Using a hex editor, examine your file (rootfs-jffs2.img).
Record a few bytes at offset 0 and offset 0xc00000 (where you split
it). Make sure the bytes just before and after the split point are
recorded.
Now go to you board and examine the flash. There are several ways to do
this. One way is to copy the whole sector to a file (assuming you boot
NFS and have the space).
cp /dev/mtd3 somefile.img
Compare the image with the one you started with. The new one will be
larger because you dump the whole flash section, so ignore the extra
data.
This is not really a solution to your problem, but can give you some
techniques to help figure out how to determine what is wrong.
Good luck!
Steve
mohammed shareef wrote:
Dear Steve,
i did as you said, transfered both the images one after the other.
then i made nodes for mtd3 and mtdblock3
and i tried to test whether the fs is able to mount:
i did:
mount -t jffs2 /dev/mtdblock3 /mnt/flash
then i got the following error:
jffs2)scan)eraseblock():magic bitmask 0x1985 not found at 0x00000000:
0x05cf instead
..
..
Old JFFS2 bitmask found at 0x00012cd8
You cannot use older JFFS2 filesystems with newer kernels
and it doesnt mount in /mnt/flash
could you please tell me whats wrong.
thank you,
regards,
Shareef
On Fri, Jun 27, 2008 at 12:03 AM, Steve Poulsen <spoulsen@xxxxxxxxxxxxx> wrote:
Mohammed,
This is the correct approach. As long as you avoid anything below 0x240000,
you avoid touching u-boot and the kernel. I suggest to turn protect off
only for the sectors needed. The sectors/addresses depends upon your flash.
If you are using the OSK, then these are told in the OSK newbie guide (I
can't recall and our flash is different).
For the OSK, the filesystem is at 0x240000. Therefore, you transfer the
first file to 0x240000 and the next file transfers to 0x240000 + 0xc00000
(E40000). This is purely a memory copy. You don't need to combine.
When you place the two pieces next to each other, they are basically
combined.
I'm not sure you understand this, but when you use tftp, you are copying the
file to SDRAM. This address is fixed for the OSK at 0x10000000.
Therefore the steps are:
1) tftp part 1 into memory 0x10000000
2) copy the memory of 0x10000000 to 0x240000
3) tftp part 2 into memory 0x10000000
4) copy the memory of 0x10000000 to 0xE40000
5) Reset the board (You could boot from here if you wish, but a reset is
simpler and puts the flash back to protected)
Steve
mohammed shareef wrote:
i erased location 0x240000 to 0x1ffffff;
then i transfered the first file to location 0x240000, the size of the
first image was c00000 (12Mb)
but now i have the second image on RAM of osk.
the flash segment for ffs2 filesystem runs from 0x01000000 till
0x0fffffff(please correct me if i am wrong). i dont know to which
location on flash to transfer this to. could someone please help me on
this. thank you. and i also have doubts on how to combine the two
images on the flash and make it tun. thannk you.
regards,
Shareef
On Thu, Jun 26, 2008 at 9:59 PM, mohammed shareef <mdshareef@xxxxxxxxx>
wrote:
Dear Steve,
i split the file into two pieces:
split rootfs-jffs2.img --bytes=12m
so i have two files with xaa(12Mb) and xab(11.5Mb)
i was ablt to transfer the first file completely with any problem.
but i dont know what to do next. should i transfer the first image in
RAM to flash? could you please tell me how many sectors i need erase
and from which bank? i am afraid that i may end up erasing the u-boot.
thank you.
regards,
Shareef
On Thu, Jun 26, 2008 at 9:41 PM, Steve Poulsen <spoulsen@xxxxxxxxxxxxx>
wrote:
Mohammed,
When you tftp the file to memory, you need to make sure the filesize
fits in
the memory available. Since you have experimentally done that and now
want
to flash the pieces, I suggest you look at the "split" command under
Linux.
You will need to split the file into pieces that fit into RAM and flash
at
the proper address. If you split the file into two pieces, then you
will
need to flash the first piece at address X and the second piece at
address X
+ 16meg. You should make sure you split the file on a sector boundary.
If
you don't want to think about this, then you should erase/unprotect the
whole area you will need first, then transfer and flash the pieces. You
may
want to look at the omapfl utility. With some modification, you could
flash your image more easily via USB.
Steve
mohammed shareef wrote:
Hi,
I tried to do the same procedure with a small filesystem image <
16Mb... it worked. i didnt have such problems. so could someone please
tell me how to divide the filesystem image in to two and flash it?
thank you,
regards,
shareef
On Thu, Jun 26, 2008 at 4:36 PM, mohammed shareef <mdshareef@xxxxxxxxx>
wrote:
Hi,
i did the below. i got an image. but i am still having the same
problem
my file size is 23Mb
[root@localhost tftpboot]# mkfs.jffs2 --squash -r /data/rootfs2.6
-e131072 > /data/rootfs-jffs2.img
[root@localhost tftpboot]# cp /data/rootfs-jffs2.img
/tftpboot/rootfs-jffs2.img
\0x09
#################################################################
\0x09 #############undefined instruction
pc : [<e0000004>] lr : [<00000002>]
sp : 1103fca4 ip : 11095dd8 fp : 00000001
r10: 10963410 r9 : 1103fd24 r8 : 1103ffdc
r7 : 270a30a1 r6 : 8695632d r5 : 08016ffa r4 : 5aebcc39
r3 : 00000032 r2 : 11095dd4 r1 : 000000a0 r0 : 00000000
Flags: nZCv IRQs off FIQs off Mode SVC_32
Resetting CPU ...
could you please tell me what i should do. thank you.
regards,
Shareef
On Wed, Jun 25, 2008 at 9:52 PM, Hunter, Jon <jon-hunter@xxxxxx>
wrote:
then i changed the filename and the
tftpboot transfer started. But on the mid-way it complains
"undefined
instruction".
could some one please tell me where the problem is? thank you.
How big is the file that you are attempting to download over tftp?
U-boot executes in the upper part of the RAM and so if your file is
too
big, then there is a good chance you are overwriting u-boot which
would
cause u-boot to crash eventually. U-boot does not protect against
this. This
would be a potential cause of an undefined instruction exception.
Jon
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