How to read the uboot2015.04?

[brucecyc]

Hello everyone:

     My hardware platform is based on mx6sabresd,the software is base on android5.1,kernel3.14,uboot2015.04，where can I get some information about uboot2015.04?which refernce can I read to get across the uboot  boot process?

[gusarambula · Accepted solution]

Hello Bruce Chen,

There is some useful information on the uboot port for i.MX6 on the document that is attached on the first comment of the following thread.

u-boot-2015.04 how to start with logo

You may find a lot of information on how U-boot works on Free Electrons material (http://free-electrons.com/docs/porting-u-boot/) and you may also find a lot of information from the U-boot project website (http://www.denx.de/wiki/U-Boot/).

Regards,

[brucecyc]

gusarambula:

     Thanks for you kindly anwser.

     I have two hardware platforms,both are based on imx6q IC,but the differences between them are as follows:

     1、the hardware difference ： DDR ,eMMC,PMIC are not same。

     2、the software difference  ： one name A is Android4.4.2，kernel,uboot2009.08;     anther named B is      android5.1,kernel3.14,uboot2015.04,

     since I want to port B to A,

     My question is :where can I get the difference between uboot2009.08 and uboot2105.04?

[gusarambula]

Hello Bruce Chen,

Thanks for providing more details on your scenario.

The main difference between u-boot 2009.08 (used up to kernel 3.0.35) and u-boot 2015.04 (used starting in kernel 3.14.52) is that the later uses a Device Tree to contain the description of the hardware separately from the Kernel.

You may find the following u-boot migration example document useful as it covers the basics on migrating U-boot.

U-Boot Migration Example

Unfortunately I couldn’t find release documentation that shows detailed differences between both Uboot releases but you may always compare the source code from the u-boot of both BSPs to compare differences.

Regards,