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Old 06-29-2009, 07:57 PM   #1
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Kindle DX serial console

For those who will need a serial console - it's relatively simple. Remove plastic cover and you'll see big pads (J9) right next to J23 connector - these are serial lines.
As usual, CMOS/TTL level converter is required (I used small board with MAX232 and external power supply I had from other project). I didn't solder anything - taped wires to the PCB with a scotch tape.
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Old 06-29-2009, 08:26 PM   #2
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Very cool! What are you using this for may I ask? Just another connectivity port besides usb?
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Old 06-29-2009, 08:30 PM   #3
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Had to recover after botched jar file update
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Old 06-30-2009, 05:57 AM   #4
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Had to recover after botched jar file update
You are my hero!!!!

I think you are doing great things with K!!

Perhaps folders in book viewer?
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Old 06-30-2009, 10:25 AM   #5
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you want everything done, work a little!

P.S. thanks ebs, you rule
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Old 06-30-2009, 04:02 PM   #6
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First networking over usb, then this. You're the man, ebs. I can't wait to see to what use you're putting all this hacking.
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Old 07-19-2009, 11:02 AM   #7
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great!!! i would try it with usb to ttl convert !, are u think j11 is jtag?
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Old 07-19-2009, 02:41 PM   #8
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great!!! i would try it with usb to ttl convert !, are u think j11 is jtag?
J11 is battery connector. I think J9 has JTAG pins
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Old 07-22-2009, 02:20 AM   #9
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Kindle dx boot log

today,finally,a usb to ttl convert has been attach to kindle dx. I got the boot log from console.

BTW:hi,ebs,can you show me your kindle dx boot log?
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Old 07-22-2009, 05:58 AM   #10
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3.Load MMC0 over USB storage

it needs PASSWORD,any one know it?
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Old 08-25-2009, 02:57 AM   #11
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Originally Posted by ebs View Post
Had to recover after botched jar file update
Hello, can You explain recovery process (step by step)

I think I damaged something important.

My Kindle doesn't boot now... Display shows "Kindle is starting up, this can take a minute" since last night
When I press "Home" Kindle is in recovery mode, and I can access it via usb. BUT THERE ARE NO FILES!!! No any folders, It's clear.

I can't remember what exectly I did from serial console. It was 2 steps. Can you show me recovery menu? I think I will remember what items I chose.
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Old 08-25-2009, 03:43 AM   #12
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I cannot explain it because it depends on what you actually did.
In my case, I modified U-Boot environment to boot directly to the shell skipping normal systemv init sequence and restored jar file I corrupted.
In other words, you have to be pretty fluent in low-level Linux admin stuff to do what I did, there is no menu or step-by-step instructions (I don't even remember exact commands)
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Old 08-25-2009, 10:09 AM   #13
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Thank you for quick reply.

As I read from U-Boot docs I need add only 1 kernel argument
setenv bootargs $bootargs init=/bin/sh
then boot.

I'try tomorrow. Wish me luck
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Old 08-25-2009, 12:26 PM   #14
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Quote:
Originally Posted by dr_g100k View Post
Thank you for quick reply.

As I read from U-Boot docs I need add only 1 kernel argument
setenv bootargs $bootargs init=/bin/sh
then boot.

I'try tomorrow. Wish me luck
No, it's not that simple. You have to *add* this to bootargs, otherwise you don't even see anything on serial console.
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Old 08-30-2009, 10:12 AM   #15
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OK. I got serial console again.

As I said I damaged something important
My steps:
from recovery menu

Code:
Menu
====
3. Load MMC0 over USB storage
4. Erase MMC0
I. Initialize Partition Table (fdisk) and format FAT
O. Format and overwrite FAT partition
E. Export FAT partition
U. Update using rootfs.img.gz or rootfs.img on FAT partition
Q. quit
Choose:  10
I chose "I"
Now my fat partition is clear and primary kernel can't mount rootfs

Is it THE END?

Log from console
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