I am using the 2.4 kernel with the Coldfire MCF5275 and I've found an
issue using the netflash application with programming files above 4meg. At
4megs the following segfault error occurs.
-----------------------------------------------------------------------------------
Write of 58388 bytes at pos 4194304 (data at 00540000)
bad frame format: 00000000
PC: [<040f5e00>]
SR: 2014 SP: 005a3f4c a2: f30ba003
d0: 00000000 d1: 00000061 d2: 000006ff d3: ffffe703
d4: 00000004 d5: 00000000 a0: 00448010 a1: 005a2000
Process netflash (pid: 54, stackpage=005a3000)
Frame format=5
Stack from 005a3f80:
005745e0 03f30ba0 00000006 03e23dfc 005a3fc4 00047326 005745e0
03f30ba0
00000006 03e23dfc 00000036 00047128 00000001 00400000 03e20e14
03e214f8
03e23f14 03e23f14 00023af6 00000004 00000006 03e23dfc 00000001
00000000
00000006 00000004 00400000 ffffffda 00000036 00000000 40800000
003a0e94
Call Trace:
[<00047326>] [<00047128>] [<00023af6>]
Code: bad frame format: 00000000
PC: [<00022234>]
SR: 2714 SP: 005a3ec4 a2: 005a4000
d0: 00000000 d1: 00000f58 d2: 00000000 d3: 003a0e94
d4: 005a4000 d5: 00000000 a0: 040f5e00 a1: 00109178
Process netflash (pid: 54, stackpage=005a3000)
Frame format=4 Stack from 005a3f00:
00000004 00028730 005a3f2c 0002260c 005a3f4c 000e7fd5 005a223c
00000036
005a3000 f30ba003 e23dfc00 005a3f40 00021f42 000e7d1c 005a3f4c
00000000
5a3f9000 00023a30 005a3f4c 00000061 000006ff ffffe703 00000004
00000000
00448010 005a2000 f30ba003 00000000 ffffffff 00000000 54082014
040f5e00
005745e0 03f30ba0 00000006 03e23dfc 005a3fc4 00047326 005745e0
03f30ba0
00000006 03e23dfc 00000036 00047128 00000001 00400000 03e20e14
03e214f8
Call Trace:
[<00028730>] [<0002260c>] [<000e7fd5>] [<00021f42>]
[<000e7d1c>] [<00023a30>] [<00047326>] [<00047128>]
[<00023af6>]
Code: 3030 2a00 2f00 4879 000e 7eb6 4eb9 0002 8730 508f
SIGSEGV
---------------------------------------------------------------------------------------------
I was able to narrow down the exact function causing the problem in
/linux-2.4.x/drivers/block/blkmem.c In general_program_func(), the function
call to set_bit() is causing the segfault.
When the function is commented out, the application works fine. I'm still
working on the work around for this problem, but if anyone is aware of a
solution if you could let me know so I can update it.
int general_program_func(struct inode * inode, struct file * file, struct
arena_t * a, struct blkmem_program_t * prog)
{
unsigned long i,block;
unsigned long erased = 0;
/* Mandatory flush of all dirty buffers */
fsync_dev(inode->i_rdev);
invalidate_buffers(inode->i_rdev);
for(i=0;i<prog->blocks;i++) {
int min= prog->block[i].pos / a->blksize;
int max = (prog->block[i].pos + prog->block[i].length - 1) / a->blksize;
for(block=min; block <= max; block++) {
if (!test_bit(block, &erased)) {
printk("Erase of sector at pos %lx of arena %d (address
%p)\n", block * a->blksize, MINOR(inode->i_rdev),
(void*)(a->address+block*a->blksize));
/* Invoke erase function */
a->erase_func(a, block * a->blksize);
*//set_bit(block, &erased);
* }
}
printk("Write of %lu bytes at pos %lu (data at %p)\n",
prog->block[i].length, prog->block[i].pos, prog->block[i].data);
a->write_func(a, prog->block[i].pos, prog->block[i].length,
prog->block[i].data);
schedule();
}
#ifdef CONFIG_UCLINUX
if (prog->reset)
HARD_RESET_NOW();
#endif
return 0;
}
Thanks
Bruce
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