Unable to run in release mode for aarch64

[li041]

Description

On AArch64, the CPU ID retrieved during early boot is corrupted in non-debug (optimized) builds. The corruption occurs before SMP bring-up, indicating that the issue originates in the early boot path rather than later runtime logic.

Root Cause

At address 0x40400050, x17 is used as a loop variable after compiler optimization. In earlier (non-optimized or debug) builds, this register was not used for this purpose.

However:

• x17 is a caller-saved register per the AArch64 ABI
• Its value is assumed to remain intact across calls during early boot
• This assumption is invalid under optimization

As a result, x17—which temporarily holds the CPU ID—is overwritten during boot_pt_init, leading to corrupted CPU identification.

Resolution

The issue is resolved by:

• Replacing the use of x17 with x19, which is callee-saved according to the AArch64 calling convention