[U-Boot-Users] start.S code snippet doubt

Hi all,

What does the following code achieve: (Code snippet from start.S) boot_cold: #if defined(CONFIG_MPC8260ADS) lis r3, CFG_DEFAULT_IMMR@h nop lwz r4, 0(r3) nop rlwinm r4, r4, 0, 8, 5 nop oris r4, r4, 0x0200 nop stw r4, 0(r3) nop #endif /* CONFIG_MPC8260ADS */

Can anyone please tell me the importance/significance of this code?

Regards, Nishant