Uboot environment for LEDE install (Kirkwood)

Can anybody show me correct settings of Uboot environment for LEDE installation to kirkwood Iomega Iconnect?
[https://wiki.openwrt.org/toh/iomega/iconnect]
U-Boot 2014.10. It seems default environment values are not suitable for LEDE.
Installing with serial console and TFTPD (sysupgrade from OpenWRT doesn't work at this platform)

.../17.01.4/targets/kirkwood/generic/lede-17.01.4-kirkwood-iconnect-uImage   (as uImage)
.../17.01.4/targets/kirkwood/generic/lede-17.01.4-kirkwood-iconnect-initramfs-uImage (as rootfs).
After executing paragraphs 6.2, 6.3 of link above result at bootlog:
.......
[    1.085979] Creating 4 MTD partitions on "orion_nand":
[    1.091167] 0x000000000000-0x0000000e0000 : "u-boot"
[    1.098230] 0x0000000e0000-0x0000001e0000 : "u-boot environment"
[    1.105603] 0x000000100000-0x000000300000 : "ubi"
[    1.111667] 0x000000200000-0x000020000000 : "ubi"
.......
[    1.278721] UBI error: no valid UBI magic found inside mtd2
[    1.284410] rtc-mv f1010300.rtc: setting system clock to 2017-11-12 09:52:35 UTC (1510480355)
[    1.295170] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
[    1.302728] Please append a correct "root=" boot option; here are the available partitions:
[    1.311145] 1f00             896 mtdblock0  (driver?)
[    1.316227] 1f01            1024 mtdblock1  (driver?)
[    1.321328] 1f02            2048 mtdblock2  (driver?)
[    1.326428] 1f03          522240 mtdblock3  (driver?)
[    1.331511] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)