what the different between Sitara Linux SDK v8.0 and Processor SDK v1.0

Hi,

You can refer to the release notes for both sdks:

SDK8.0: processors.wiki.ti.com/index.php;oldid=197860
SDK1.0: processors.wiki.ti.com/index.php;oldid=199194

For details about kernel & u-boot you can check the Kernel & U-boot Relase notes links inside both of the above links.

Regarding PRU installing and enabling withing linux kernel you can refer to this guide: processors.wiki.ti.com/.../PRU-ICSS_Installer
Additional information about PRU can be found here: processors.wiki.ti.com/.../PRU-ICSS
There are also some links regarding enabling pru inside linux kernel, i.e.:
e2e.ti.com/.../389259

Hope this helps.

Best Regards,
Yordan