By accident I've deleted the second stage U-Boot:
root@OpenWrt:~# cat /proc/cpuinfo | head -2 ; echo ; hexdump -C /dev/mtd1
system type : Qualcomm Atheros QCA956X ver 1 rev 0
machine : TP-LINK TL-WR1043N v5
00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
*
00020000
Does anybody know where to get this U-Boot ?