On 03/14/2014 04:42 PM, hunter hu wrote:
Hi,
OK, I think I need to close the topic and drew a conclusion:
The conclusion is: my board in question, which is an IView435TPC,
doesn't allow any hacking on NAND by doing something magic inside closed
source boot1.
The conclusion fis based on my following observations:
1. I have tried Installing to NAND sunxi wiki instructions, it works
fine. just git checkout lichee-dev, make the CONFIG_BOOTCOMMAND
changes with fatload inside include/configs/sun5i_a13.h, basically
that is the line we put inside boot.cmd for boot.scr. No need to do
any dram configurations as we want to do in sd card boot case.
correct, dram is initialized by boot0/boot1
2. when I was using nand-part tool to repartition the internal NAND,
the last re-read partition table command returns -1 on the iview
tablet, but return 0 on Olimex a13 board, which indicates something
is going on in the iview nand.
nand-part may simply not support the newer version of libnand used on
this tablet
3. I could see no debugging output from serial when hooking up with
UART1 on the iview, but everything is OK on Olimex NAND, I can see
boot0 loading messages, as well as lichee-dev uboot, and my uImage
output.
Closed blobs make you cry. You probably have an incompatible libnand.
But fear not, the mtd driver is very slowly progressing. A year from now
we might be thinking 'oh, heh, good riddens libnand is gone'.
So, the lesson learned here is for some of the commercial tablets out
there, they must have put some magic keys/encryptions to lock down their
internal NAND to prevent any hacking or manipulations, no debug output
from serial is a very good sign of such lock down.
You are the very first one that 'might' (unlikly) have a locked down
nand. I sincerly doubt it's locked down at all.
Olliver
Hope these notes are helpful to someone, and my appreciations to all the
help from you guys.
Cheers,
-Hunter
On Friday, March 7, 2014 5:09:41 PM UTC-6, hunter hu wrote:
Hi,
I finally got the serial port working on my board, just a side note,
we need a pull up resistor at the Rx pin, and I am using UART1 with
SD card approach, anyone struggles with serial port, here is the
thread that helped me:
https://www.olimex.com/forum/index.php?topic=1788.0
<https://www.olimex.com/forum/index.php?topic=1788.0>
All goes well with the SD u-boot and I can stop at u-boot prompt and
play with it, booting up as usual too by typing boot.
However when I set the NAND stuff up with lichee-dev u-boot built
out of sun5i_a13, there is no serial output at all upon boot and
stuck at logo, which indicates something is wrong with the u-boot
image and it didn't run as expected.
I also tried just use the stock android u-boot, some posts say we
can stop android u-boot when booting up, I didn't see that happen
either.
Any ideas how to proceed from here would be greatly appreciated.
Thanks in advance,
-Hunter
On Wednesday, March 5, 2014 10:13:45 PM UTC-6, hunter hu wrote:
Thanks Pat,
I have used the correct syntax, but still, stuck at the SUNXI
logo; at this moment I have a few questions:
1> my cpu is A13, your u-boot is for A20, I would think that is
not working for me?
2> I have been using lichee-dev, sun5i_a13 board, trying to
modify the configurations as shown before; when I was adding my
board to the u-boot-sunxi, I had to add a dram_myboard.c to
configure the DRAM by following the sunxi wiki instructions, I
tried to do with and without the DRAM stuff, the same, stuck at
the logo, I believe I have to get the serial port working first.
Thank you very much for all help so far, I greatly appreciated.
-Hunter
On Wednesday, March 5, 2014 9:35:06 PM UTC-6, Patrick Wood wrote:
fatload nand 0 kernel_address kernel_file
Note that my u-boot is based on a heavily-modified version
of the one used by android.
On Wednesday, March 5, 2014 10:10:03 PM UTC-5, hunter hu wrote:
Hi Pat,
I was not be able to get serial port access yet, work in
progress.
Regarding the syntax, what are the correct ones?
thanks,
-Hunter
On Wednesday, March 5, 2014 8:51:22 PM UTC-6, Patrick
Wood wrote:
That's not the right syntax for file access. Don't
you have a serial port you can get boot logs from?
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