Something

root@OpenWrt:/# mount -t vfat /dev/sda1 tmp/foo
root@OpenWrt:/# ls tmp/foo/
Break instruction in kernel code[#1]:
Cpu 0
$ 0   : 00000000 fffbffff 802a0000 00000000
$ 4   : 802fbc48 01f4d000 00000010 00000002
$ 8   : 00000005 00000002 00000000 80260000
$12   : 0000001f 00000000 21f03000 a13b30c0
$16   : 81f10e30 81f10e60 00000002 00000003
$20   : 00000005 802fbc48 c0008380 81effea4
$24   : 00000001 8004d9d0
$28   : 81f12000 81f13e10 00000001 8004dab0
Hi    : 00000000
Lo    : 00000000
epc   : 8004da24     Tainted: P
ra    : 8004dab0 Status: 1000bc03    KERNEL EXL IE
Cause : 10800024
PrId  : 00019064
Modules linked in: usb_storage sd_mod scsi_mod ehci_hcd ath_ahb wlan_xauth wlan_
wep wlan_tkip wlan_ccmp wlan_acl ath_rate_sample ath_hal(P) wlan_scan_sta wlan_s
can_ap wlan ip_conntrack_tftp ip_nat_irc ip_conntrack_irc ip_nat_ftp ip_conntrac
k_ftp ppp_async ppp_generic slhc crc_ccitt vfat fat nls_iso8859_1 nls_cp437 usbc
ore nls_base
Process usb-storage (pid: 887, threadinfo=81f12000, task=81e651a8)
Stack : 7fffffff 81f13e70 81effea4 00000000 81f10e00 81efff04 c0008380 813b2d34
        813b2cc0 00004000 c019ef64 81e651a8 8005daf0 00100100 00200200 00000000
        81effea4 00004000 c0008380 813b2d34 813b2cc0 0000001f 813b2cc0 81effea4
        00000000 c027a90c 81f13e74 81effea4 c0008300 00000000 81f10e00 00000005
        00004000 00000010 00000200 c027b020 a1f0300f a1f03000 81effea4 00004000
        ...
Call Trace:[<c019ef64>][<8005daf0>][<c027a90c>][<c027b020>][<c027b0a0>][<c027b06
0>][<c027a614>][<c027c838>][<c027b40c>][<80228bdc>][<c027c838>][<c027ca54>][<802
28df4>][<c027c838>][<c027c838>][<8007c388>][<8007c370>][<80044b78>][<80044b68>]

Code: 8e220000  14400003  3c02802a <0200000d> 3c02802a  8c43d2c0  8e020000  0043
1023  00021143