Erik> What do you mean with "boundaries"? What locations do you mean? Could
Erik> you give an example?
I don't have anything to base it on other than that seems to be what it is.
Almost like the kernel, for example, would think there was a block of 10
locations. So, it goes and writes to those 10, but the hardware only has 9
and it fails on the last one. Check out the output below from devmem2. I
would think I should be able to write to the last location in ram...
> I wasn't too worried about it throwing up stuff to the terminal when I
tried
> the original. I just wanted to see if it wouldn't crash. So, you're
> suggestion was also good and yes, it crashes at the same spot. I'll
include
> the output below. The reason I picked on this is because it is crashing
in
> the same way that other programs have been crashing on me so I thought it
> may be a good and easy thing that if I can get this to work, the others
> should as well. Anything else I could try to see if things are setup
> correctly?
Erik> OK, same place, so it might not be RAM related. Well, it still can. If
Erik> the ramdisk is always mapped at the same place (which it most probably
Erik> will) and that place is somehow corrpupt, things will go wrong. Could
Erik> you upgrade to a newer kernel and see if that solves the problem?
I also tried removing the ramdisk from the kernel config and it acts the
same as it did before. While I could try a different kernel, I can use this
same kernel with most things the same, but on an EK board, and it works
fine, no problems. Both have 32M of ram, both have a nor flash etc. This
is what is so confusing as I have tried going through all differences etc
and it just doesn't make sense.
I used devmem2 and saw 1 thing that was interesting:
# ./devmem2 0x21FFFFFC
/dev/mem opened.
Memory mapped at address 0x40006000.
Value at address 0x21FFFFFC (0x40006ffc): 0x7B5EAB79
# ./devmem2 0x21FFFFFD
/dev/mem o[ 730.260000] Unhandled fault: external abort on non-linefetch
(0x01a
) at 0x40006ffd
pened.
Memory mapped at address 0x40006000.
Bus error
#
Why wouldn't this work at 0x21FFFFD ?
# cat iomem
00300000-003fffff : at91_ohci
00300000-003fffff : ohci_hcd
10000000-107fffff : physmap-flash.0
10000000-107fffff : physmap-flash.0
20000000-21ffffff : System RAM
20029000-202a7fff : Kernel text
202a8000-202d6e17 : Kernel data
40000000-4fffffff : at91_nand
80000000-8017ffff : FPGA video memory
80000000-8017ffff : dcifb mem
80800000-80800004 : FPGA video registers
80800000-80800004 : dcifb regs
fefbc000-fefbffff : at91_ether
fefff200-fefff3ff : atmel_usart.0
fefff200-fefff3ff : atmel_serial
fffb4000-fffb7fff : at91_mci
fffb4000-fffb7fff : at91_mci
fffe0000-fffe3fff : at91_spi.0
fffe0000-fffe3fff : at91_spi
# df
Filesystem Size Used Available Use% Mounted on
# cd /proc
# cat filesystems
nodev sysfs
nodev rootfs
nodev bdev
nodev proc
nodev sockfs
nodev usbfs
nodev pipefs
nodev futexfs
nodev tmpfs
nodev inotifyfs
nodev eventpollfs
nodev configfs
ext2
nodev ramfs
msdos
vfat
ntfs
nodev jffs2
# cat mounts
rootfs / rootfs rw 0 0
/dev/root / ext2 rw 0 0
proc /proc proc rw 0 0
#
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