about U-BOOT

[Jackie Im]

Hi~
I use kindle paperwhite 2nd.
I would like to change uboot to new uboot.
and i would like to "mmc write" command but kindle's uboot do not support.
please let me know how to do.

thank you.

[knc1]

Originally Posted by Jackie Im

Hi~
I use kindle paperwhite 2nd.
I would like to change uboot to new uboot.
and i would like to "mmc write" command but kindle's uboot do not support.
please let me know how to do.

thank you.

That Kindle has two different builds of u-boot.
Have you tried them both?
(The more complete build is named: BIST on the first level u-boot's menu.)

- - - -

On earlier Kindles, installing u-boot was done with the erase-all command.
You will have to read the sources that Amazon has released to see if that is still true.

Ah, what your looking for in the sources:
The erase-all command (after forgetting to save the device and personal info sections) did just that, erased all of the mmc and then unlocked the u-boot storage area and copied the then executing u-boot into mmc followed by re-locking that area.

- - - -

BIG NOTE:
The Paperwhite gen 2 is not the ideal device to be used for a first-time explorer.
(Since you had to ask, you must just be starting out. Starting out on this device is a really big "bad idea".)

[Jackie Im]

Thank you.
I succeed to compile uboot.
how can i change uboot.bin?
where can i use erase-all command? terminal? uboot?
please let me know.

[knc1]

Hint: read the u-boot sources you just used to build u-boot.

Note: If you check my post above, I suggested that you do that to confirm the u-boot replacement code was still being included in the compiled sources.

Reading and understanding what you just built and now intend to install without testing is an important next step before you try to install and use it.

I have attached a preview of where you are headed.