[Bug] Build failure in examples/standalone: invalid hex number '(CONFIG_SYS_SDRAM_BASE + SZ_16M)'

[Lincolnzheng]

Description

I am unable to compile the examples/standalone target for the StarFive VisionFive 2 board. The build fails with a linker error stating invalid hex number.

Environment

• Board: StarFive VisionFive 2
• Build Target: examples/standalone/
• Toolchain: riscv64-linux-gnu- (GCC 13 via Ubuntu package)
• OS: Ubuntu Linux (x86_64 host)

Steps to Reproduce

1. Clean the build environment:
   make distclean

2. Configure for the board:
   make starfive_visionfive2_defconfig

3. Verify configuration (Ensured examples are enabled):
   make menuconfig

4. Run the build command for standalone examples:
   make CROSS_COMPILE=riscv64-linux-gnu- examples/standalone/