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
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
