RT-AC86U 1024MB RAM support.

[hpo14]

OK, back to my situation. The reason i want to build CFE was due to this NAND problem
The "bad" one has already replaced a new nand chip. (the full log is in attachment)

My good rt-ac86u

nand: Could not find valid ONFI parameter page; aborting
nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xda
nand: Macronix NAND 256MiB 3,3V 8-bit
nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
bcm63xx_nand ff801800.nand: Adjust timing_1 to 0x65324458 timing_2 to 0x80040e54
bcm63xx_nand ff801800.nand: detected 256MiB total, 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4

My Bad rt-ac86u

NAND ECC BCH-8, page size 0x800 bytes, spare size used 108 bytes
NAND flash device: , id 0xc2da block 128KB size 262144KB
...
nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xda
nand: Macronix NAND 256MiB 3,3V 8-bit
nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
bcm63xx_nand ff801800.nand: Adjust timing_1 to 0x65324458 timing_2 to 0x80040e54
bcm63xx_nand ff801800.nand: detected 256MiB total, 128KiB blocks, 2KiB pages, 27B OOB, 8-bit, BCH-8

 

[chavo]

OK, back to my situation.

if you need i have working full nand dump

 

[hpo14]

if you need i have working full nand dump

Although i already have two full nand dump by my own with two different tools from a good rt-ac86u.
(one was a python script using dn command to dump content from cfe mode. Another was a nand programmer)
But, yes. I'd be glad if you can share it (Prefer google driver or Mega.nz, or i can provide a private FTP). Maybe i can find something difference.

 

[hpo14]

if you need i have working full nand dump

With your full nand dump, I got the same "bad result" as mine before.
(I use a new nand chip with 0 bad block.)

NAND ECC BCH-8, page size 0x800 bytes, spare size used 108 bytes
NAND flash device: , id 0xc2da block 128KB size 262144KB
...
nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xda
nand: Macronix NAND 256MiB 3,3V 8-bit
nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
bcm63xx_nand ff801800.nand: Adjust timing_1 to 0x65324458 timing_2 to 0x80040e54
bcm63xx_nand ff801800.nand: detected 256MiB total, 128KiB blocks, 2KiB pages, 27B OOB, 8-bit, BCH-8

And your full nand dump includes OOB block (spare area).
So, i tried two method with the dump file.

Method 1: (program the nand with spare area [oob])
1. Erase the nand.
2. Program the nand with full dump (276824064 Bytes, 264MB)
3. Dumpping the nand and compare to the source file. Confirmd they are the same.
4. boot with the nand chip
5. bad result

Method 2: (program the nand without spare area [oob] )
0. Dumpping the nand from Method 1 but does not include OOB.
1. Erase the nand chip
2. Program the nand with the dump from Step 0 (268435456 Bytes, 256MB)
4. Dumpping the nand again, and compare to the Step 0. Confirmd they are the same.
5. boot with the nand chip
6. bad result.

Attached photo is my nand programmer (NANDO), and my modification with rt-ac86u (for easy change nand chip)

 

[chavo]

what error does the router show?
With my dump asus used BCH-8 algorithm ?

Yes, my dump has spare area.

i used Rose's metal for fast solder-desolder NAND. it has a melting point of 100C and can be easily soldered with a dryer for soldering

NAND ECC BCH-4, page size 0x800 bytes, spare size used 64 bytes
NAND flash device: , id 0xc2da block 128KB size 262144KB

nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xda
nand: Macronix NAND 256MiB 3,3V 8-bit
nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
bcm63xx_nand ff801800.nand: Adjust timing_1 to 0x65324458 timing_2 to 0x80040e54
bcm63xx_nand ff801800.nand: detected 256MiB total, 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4

https://aliexpress.ru/item/33007126622.html

https://aliexpress.ru/item/32849876144.html

Rose's metal - Wikipedia

en.wikipedia.org

 

[hpo14]

what error does the router show?
With my dump asus used BCH-8 algorithm ?

Yes, my dump has spare area.

i used Rose's metal for fast solder-desolder NAND. it has a melting point of 100C and can be easily soldered with a dryer for soldering

A good suggestion of using Rose's metal.
But, as i had modified my router to an online nand programmer and i also have another offline nand programmer.
It let me easily change / switch nand chip live, without worried about the soldering or desoldering.

OK, back to my issue XD. I think the ECC problem was the miss configuration of my usb-to-uart converter.

When i use USB - to - TTL mode, and connect the TX/RX/GND from convert board to AC86U board,
Then boot up the router, i got following abnormal bootstrap register and nand config

Boot Strap Register:  0x6fc43
NAND->NandAccControl = 0xc308001b
08 -> ECC bits => BCH-8
1b -> OOB arg => 108 bytes OOB

But if i use USB - to - 232 mode, and connect the TX/RX/GND from convert board to AC86U board,
Then boot up the router, i got following correct bootstrap register and nand config

Boot Strap Register:  0x6fc42
NAND->NandAccControl = 0xc3040010
04 -> ECC bits => BCH-4
10 -> OOB arg => 64 bytes OOB

Boot up router with usb converter ==>	TTL mode TX/RX/GND connected	TTL mode no pin connected	RS232 mode TX/RX/GND connected
Boot Strap Register	0x6fc43	0x6fc42	0x6fc42
ECC bits	BCH-8	BCH-4	BCH-4
OOB size (spare area)	108 Bytes	64 Bytes	64 Bytes

Although the correct config of my usb converter solved the ECC error problem.
But i still can not boot up with a good nand which flashed with official asus firmware (version: 2021/11/25 -- 3.0.0.4.386.45956 // FW_RT_AC86U_300438645956.w)
Maybe is a hardware issue......
Logs attached => 86u.log

i'll try with other nand chip tonight. (i bought about 10pcs)

 

[dominik]

if you need i have working full nand dump

I'm looking for that, can You please share it to me?

 

[chavo]

I'm looking for that, can You please share it to me?

132.39 MB file on MEGA

mega.nz

 

[dominik]

132.39 MB file on MEGA

mega.nz

Thanks!

 

[ehub668]

Hi,
do I need to modify CFE and firmware to change to 1G memory?
Where is the source code of memory config 0x1427 in CFE?

 

[chavo]

Hi,
do I need to modify CFE and firmware to change to 1G memory?
Where is the source code of memory config 0x1427 in CFE?

modify https://www.snbforums.com/threads/rt-ac86u-1024mb-ram-support.69877/post-660911

file release/src-rt-5.02hnd/shared/opensource/boardparms/bcm963xx/boardparms.c

{bp_ulMemoryConfig,          .u.ul = BP_DDR_SPEED_800_11_11_11 | BP_DDR_TOTAL_SIZE_512MB| BP_DDR_DEVICE_WIDTH_16 | BP_DDR_TOTAL_WIDTH_16BIT | BP_DDR_SSC_CONFIG_1},

 

[ehub668]

modify https://www.snbforums.com/threads/rt-ac86u-1024mb-ram-support.69877/post-660911

file release/src-rt-5.02hnd/shared/opensource/boardparms/bcm963xx/boardparms.c

{bp_ulMemoryConfig,          .u.ul = BP_DDR_SPEED_800_11_11_11 | BP_DDR_TOTAL_SIZE_512MB| BP_DDR_DEVICE_WIDTH_16 | BP_DDR_TOTAL_WIDTH_16BIT | BP_DDR_SSC_CONFIG_1},

Thanks！

 

[ehub668]

After I replaced the memory, the Lan4 light turned on when I turned it on.
Did I solder the memory wrong? or need TTL to replace the file

 

[chavo]

After I replaced the memory, the Lan4 light turned on when I turned it on.
Did I solder the memory wrong? or need TTL to replace the file

After replacing the memory, the router should work as usual. should show 512 MB. after editing the firmware will show 1 GB

 

[ehub668]

After replacing the memory, the router should work as usual. should show 512 MB. after editing the firmware will show 1 GB

Well, the model I soldered is MT41K512M16HA-125:A, I think I need to re-solder it again, or change to the same memory model as yours

 

[chavo]

Well, the model I soldered is MT41K512M16HA-125:A, I think I need to re-solder it again, or change to the same memory model as yours

D9STQ good memory. Must work

 

[ehub668]

D9STQ good memory. Must work

it worked, thanks