PROCESSOR-SDK-J721S2: 8.5 rtos sdk

Hi,

xin lei said:

  I read some documents which mention that sbl is faster than spl. And I read something on sbl startup sequences, I really do not know what makes sbl faser than spl? what is the critical step in sbl making it faster?

Multiple reasons that makes SBL faster than SPL:

• Size of SBL the binary is smaller compared to SPL. So ROM takes lesser time to load SBL than SPL.
• SBL has bare minimum code & It is TI specific code repository. SPL on the other hand is a standard U-Boot based code repository and its a generic framework so the code base is bigger & hence the binaries are bigger.
• SBL is built specific to a boot media and hence its very optimal where as the SPL single binary supports multiple boot modes & has more checks and is more generic and hence slower.
• SPL based boot flow has more stages and this needs to be optimized as well where as SBL can directly load cores either using the boot app or the combined appImage.

- Keerthy