Sometimes boot NOR sometimes boot NAND

ponzi1 · 2021-07-27T04:52:39.631Z

I don’t really understand UART. What do I need to purchase and how do I connect this?

ponzi1 · 2021-07-27T05:43:24.738Z

alzhao:

You can open and connect UART to check the console output?

I think I have some uart. Is every one same? I don’t know what application I need to talk to console. But if you can tell me I can probably use this. Linux, not Windows please.

alzhao · 2021-07-27T09:06:02.425Z

For Linux pls use gkermit

docs.gl-inet.com

UART Serial - GL.iNet Docs

Documentation for GL.iNet Productions

For USB to UART adapter, pls make sure yours is 3.3V not 5V.

ponzi1 · 2021-07-27T09:10:00.700Z

Okay but still you don’t say what I must connect to inside router, and what I am doing exactly with (g)kermit. You give me a link that say how to connect. Okay but this is easy part. Difficult is how physically connecting to box and what do I do when I have connection? Kermit is not magical fix, only serial interface software. I must do some things in serial interface. What things must I do?

(Okay 3.3V, thank you.)

alzhao · 2021-07-27T09:36:53.295Z

You open the case and you will see the pins

On the pins there are marks of GND, TX, RX. You should connect them to your USB UART.

image749×448 46.6 KB

For gkermit I think in the guide it said everything step by step.

ponzi1 · 2021-07-27T09:42:57.070Z

alzhao:

For gkermit I think in the guide it said everything step by step.

No it did not. The guide only describes how to connect. It does not describes what to type to fix uboot. There is nothing about how to use uart connection, just only how to make connection. Please read guide and you will see this: https://docs.gl-inet.com/en/3/dev/serial/

There is a page that come next and this page talks about uboot but the problem is that there is no uboot. If uboot could exist, I do not need UART. You can tell me TFTP settings and I can TFTP.

What is needed is exact steps.

Make connection
Type _____
Type ______

Also thank you for this diagram. You can promise that I will open router and “GND” “TXD” an d"RXD" have labels? Or you must tell me the exact pin on exact chip maybe?

alzhao · 2021-07-27T10:14:25.303Z

Maybe let me be clear:

It is highly likely that your uboot is bricked.

So I asked you connect UART and check uboot output.

And that is all. No how to fixed uboot now. Only after you can connect UART and check uboot output.

The guide is how to connect and how to set up the environment for troubleshooting, only.

ponzi1 · 2021-07-27T10:16:33.471Z

No how to fixed uboot now. Only after you can connect UART and check uboot output.

Okay but then why must I do this? Will you give me instructions to fix when I give you uboot output? Because is a lot of work to do this if it is only for you to know and not to help me to fix.

alzhao · 2021-07-27T10:18:56.062Z

It is trouleshooting.

First set up environment

Second try and get result

Third think of other ways.

As I said seems that your uboot is bricked, which mean you may not fix it by yourself. If you want to try you can go as I said. But if you do not want to trouble this, generally I will just ask you to return and refund.

ponzi1 · 2021-07-27T10:20:31.048Z

Okay troubleshooting does make sense. So I will see if there is uboot output. But you can say to me that you know uboot and can probably “think of other ways” to fix after?

alzhao · 2021-07-27T10:28:40.367Z

If uboot is bricked, the only way is to desolder the flash, then program it using a flash programmer.

I don’t want to drag you too far at present.

ponzi1 · 2021-07-27T10:31:18.397Z

Actually this is easy. What is the chip? How many pins? I do not know if I have correct clip. Also what do I use firmware file? (Remember when I upload new uboot is when it create brick.)

I find it more easy to flash than to uart. Just use flashrom?

ponzi1 · 2021-07-27T10:32:15.806Z

Most difficult: how to open this case?

ponzi1 · 2021-07-27T10:33:13.759Z

alzhao:

desolder the flash

Oh. Well this is possible not less easy. I can not flash if I do not desolder?

ponzi1 · 2021-07-28T04:06:51.595Z

alzhao:

I don’t want to drag you too far at present.

Okay I am ready to begin to flash. What I require now is pins for chip (Winbond) and a very good reason why it is necessary to desolder (usually this is not necessary).

Is this correct data sheet: https://ru.mouser.com/datasheet/2/949/w25q128jv_revf_03272018_plus-1489608.pdf

What do you mean when your diagram has “TXD” and “RXD.” This is MOSI and MISO?

You have these crossed over. Usually for MISO and MOSI they are not labeled for crossover, so this is a little confusing. Please explain.

Also please tell me which file to use. Same as above? (https://github.com/gl-inet/uboot-for-qca95xx/blob/master/bin/uboot-gl-ar300m-20201224-md5-d06d53166f9eb2cb321c15c3ec0a87e0.bin?)

Thank you.

alzhao · 2021-07-28T05:02:02.981Z

ponzi1:

What do you mean when your diagram has “TXD” and “RXD.” This is MOSI and MISO?

You misunderstood me. TX and RX is for UART, not for flash pins.

Sorry I cannot provide more support to desolder and flash using flash programmer. I don’t do that myself.

ponzi1 · 2021-07-28T05:16:08.735Z

Then why do you mention this before as one option? I spend the day getting all equipment because you say this.

Well okay, maybe you can ask the engineer for pinout for Winbond (I think is 250128/5q ?) and also please ask if they have experience using flashrom for this.

Also, while you do this please tell me what you now do actual recommend that you can give exact instructions to do.

ponzi1 · 2021-07-28T06:58:41.168Z

alzhao:

If uboot is bricked, the only way is to desolder the flash, then program it using a flash programmer.

Oh also, there are two chips? NAND and NOR? Where does uboot stay?

ponzi1 · 2021-08-04T04:15:38.556Z

alzhao:

If uboot is bricked, the only way is to desolder the flash, then program it using a flash programmer.

Hello, am still waiting for reply about this. Please provide pinout of actual chip so I can flash. You said you do not know so please ask the engineers?

Also, please ask why it is necessary to desolder. Usually it is possible flash a Winbond when it is on the board. Thank you.

ponzi1 · 2021-08-04T04:16:55.087Z

alzhao:

But if you do not want to trouble this, generally I will just ask you to return and refund.

That is not really possible, anyway it is not trouble if you can please provide the tech details required to perform flash. The engineers must know very easily I am sure.