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the limitation of sd card capacity on dm368...?

hello:

does dm368 support SDXC 64G sd card...?

I format 64G sd crad as FAT32(not exFat), and record video on my dm368 dvr board, but it always fail to record after about 2hrs recording time, and show some error message as follows:

=============ERROR MSG: =======================================

[  440.400000] oom-killer: gfp_mask=0xd0, order=0
[  440.400000] Mem-info:
[  440.400000] DMA per-cpu:
[  440.400000] cpu 0 hot: high 42, batch 7 used:35
[  440.420000] cpu 0 cold: high 14, batch 3 used:11
[  440.420000] DMA32 per-cpu: empty
[  440.420000] Normal per-cpu: empty
[  440.420000] HighMem per-cpu: empty
[  440.430000] Free pages:        1132kB (0kB HighMem)
[  440.430000] Active:9414 inactive:9103 dirty:8906 writeback:140 unstable:0 free:283 slab:1633 mapped:16 pagetables:150
[  440.450000] DMA free:1132kB min:1280kB low:1600kB high:1920kB active:37656kB inactive:36412kB present:102400kB pages_scanned:27427 all_unreclaimable? no
[  440.530000] lowmem_reserve[]: 0 0 0 0
[  440.550000] DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
[  440.570000] lowmem_reserve[]: 0 0 0 0
[  440.570000] Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no

===================================================================

I usually use sd card as media to update kernel and squashfs, however, it also show errors when I burn new squashfs into nand flash:

======= burning ERR MSG ================================

[ 1195.100000] FAT: Filesystem panic (dev mmcblk0p1)
8 % complete. Cl[ 1195.100000]     eanmarker writtefat_get_cluster: invalid cluster chaEr (i_pos 472998)n at 2740000.
asing 128 Kibyte[ 1195.110000] FAT: Filesystem panic (dev mmcblk0p1)
 @ 2760000 -- 98[ 1195.130000]      % complete. Clefat_get_cluster: invalid cluster chain (i_pos 472998)anmarker written
Era[ 1195.130000] FAT: Filesystem panic (dev mmcblk0p1)
sing 128 Kibyte [ 1195.140000]     @ 2780000 -- 98 fat_get_cluster: invalid cluster chain (i_pos 472998)% complete. Clea
nmarker written [ 1195.150000] FAT: Filesystem panic (dev mmcblk0p1)
Eras[ 1195.150000]     ing 128 Kibyte @fat_get_cluster: invalid cluster chain (i_pos 472998) 27a0000 -- 99 %
Erasi[ 1195.170000] FAT: Filesystem panic (dev mmcblk0p1)
ng 128 Kibyte @ [ 1195.170000]     27c0000 -- 99 % fat_get_cluster: invalid cluster chain (i_pos 472998)complete. Cleanm
arker written at[ 1195.180000] FAT: Filesystem panic (dev mmcblk0p1)
Erasin[ 1195.200000]     g 128 Kibyte @ 2fat_get_cluster: invalid cluster chain (i_pos 472998)7e0000 -- 99 % c
omplete. Cleanma[ 1195.200000] FAT: Filesystem panic (dev mmcblk0p1)
rker written at [ 1195.210000]     27e0000.
Writinfat_get_cluster: invalid cluster chain (i_pos 472998)g data to block
0
[ 1195.220000] FAT: Filesystem panic (dev mmcblk0p1)
[ 1195.220000]     fat_get_cluster: invalid cluster chain (i_pos 472998)
[ 1195.230000] FAT: Filesystem panic (dev mmcblk0p1)
[ 1195.230000]     fat_get_cluster: invalid cluster chain (i_pos 472998)
[ 1195.250000] FAT: Filesystem panic (dev mmcblk0p1)
[ 1195.250000]     fat_get_cluster: invalid cluster chain (i_pos 472998)
[ 1195.250000] FAT: Filesystem panic (dev mmcblk0p1)
[ 1195.260000]     fat_get_cluster: invalid cluster chain (i_pos 472998)
[ 1195.260000] FAT: Filesystem panic (dev mmcblk0p1)
[ 1195.270000]     fat_get_cluster: invalid cluster chain (i_pos 472998)
[ 1195.270000] FAT: Filesystem panic (dev mmcblk0p1)
[ 1195.290000]     fat_get_cluster: invalid cluster chain (i_pos 472998)

============================================================

...do I make mistakes or is there any patch to support SDXC 64G...? or my format procedure is wrong???

any advice will be very appreciate, thank you very much!!!