- x86 CPUs start up in 16-bit mode, even if they are 64-bit CPUs. This code
- must be placed at a particular address. This entry holds that code. It is
- typically placed at offset CONFIG_SYS_X86_START16. The code is responsible
- for changing to 32-bit mode and starting TPL, which in turn jumps to SPL.
+ x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
+ must be placed in the top 64KB of the ROM. The reset code jumps to it. This
+ entry holds that code. It is typically placed at offset
+ CONFIG_SYS_X86_START16. The code is responsible for changing to 32-bit mode
+ and jumping to U-Boot's entry point, which requires 32-bit mode (for 32-bit
+ U-Boot).