Mecool HM8 won't start. U-Boot shows only 512 MiB DRAM

[thanx]

Mecool HM8 1/8
The box stopped to boot when I noticed that the power socket of the board is loose and causing power interrupts due to bad contact. I soldered a socket, but the power LED was still red.

I was trying to revive the box via the USB burning tool (I have firmware for exactly this box), but the process stopped with an error. Also, there are some suspicious things in the UART log:

1) DDR3 chl: Rank0+1 @ 720MHz - FAIL
2) DRAM: 512 MiB

So, I think either the RAM chip is damaged, either some power component (that the RAM chip depends on) is broken

Any thoughts on how to check if the memory chip is live?
I would appreciate any thoughts on how to recover the box.


The following output is when I trying to flash it via USB Burning tool

GXL:BL1:9ac50e:a1974b;FEAT:ADFC318C;POC:3;RCY:0;EMMC:0;READ:0;CHK:AA;SD:800;USB:8;0.0;
TE: 2557364

BL2 Built : 13:18:48, Dec 21 2016.
gxl g4fc4d4e - xiaobo.gu@droid05

set vcck to 1120 mv
set vddee to 1000 mv
Board ID = 1
CPU clk: 1200MHz
BL2 USB
DQS-corr enabled
DDR scramble enabled
[B]DDR3 chl: Rank0+1 @ 720MHz - FAIL[/B]
DDR3 chl: Rank0 @ 720MHz - PASS
Rank0: 512MB(auto)-2T-11
0.0;
TE: 3021399

BL2 Built : 13:18:48, Dec 21 2016.
gxl g4fc4d4e - xiaobo.gu@droid05

set vcck to 1120 mv
set vddee to 1000 mv
Board ID = 1
CPU clk: 1200MHz
BL2 USB
0.0;
TE: 3074241

BL2 Built : 13:18:48, Dec 21 2016.
gxl g4fc4d4e - xiaobo.gu@droid05

set vcck to 1120 mv
set vddee to 1000 mv
Board ID = 1
CPU clk: 1200MHz
BL2 USB
Load fip header from USB, src: 0x0000c000, des: 0x01400000, size: 0x00004000
New fip structure!
Load bl30 from USB, src: 0x00010000, des: 0x01100000, size: 0x0000d600
Load bl31 from USB, src: 0x00020000, des: 0x10100000, size: 0x00015400
Load bl33 from USB, src: 0x00038000, des: 0x01000000, size: 0x000a9a00
NOTICE:  BL3-1: v1.0(debug):fb68908
NOTICE:  BL3-1: Built : 18:30:11, Nov  1 2016
aml log : bl31 normal boot !
[Image: gxl_v1.1.3154-065f772 2016-09-29 14:08:54 yan.wang@droid05]
OPS=0x82
c9 41 a7 c5 8f 50 6d bf 89 6f 7e e [3.357523 Inits done]
secure task start!
high task start!
low task start!
INFO:    BL3-1: Initializing runtime services
WARNING: No OPTEE provided by BL2 boot loader
ERROR:   Error initializing runtime service opteed_fast
INFO:    BL3-1: Preparing for EL3 exit to normal world
INFO:    BL3-1: Next image address = 0x1000000
INFO:    BL3-1: Next image spsr = 0x3c9


U-Boot 2015.01-g1833709-dirty (Jan 16 2017 - 16:04:54)

[B]DRAM:  512 MiB[/B]
Relocation Offset is: 16ec9000