Note that the lock bits page of the CC253x SoC cannot be programmatically written or erased (with the exception that it is possibly only when running via the debugger.) Thus the linker control files (files ending in .xcl), which are used for building an image that is to be loaded via OAD or SBL, purposely do not define any memory area on the lock bits page. This is because it is impossible for the embedded OAD or SBL boot code to program that page. Thus the linker error protects the user from the misconception that it is possible to include information for that page.