Is there any reference code for initialize Cortex-A53?

Hi,

We are going to build a ARM Cortex-A53 SOC. From the SW OS side, it is supposed to be running in 32-bit mode. The bootsequence is as following:

1. BootROM (The ROM inside SOC, un-changable, can set several boot sources for u-boot)

2. u-BOOT(Loaded by BootROM)

3. OS.

My question is: is there any reference code for the first phase boot, my BootROM listed above?

BR

/Li

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