But the linker refused...

*** ERROR L107: ADDRESS SPACE OVERFLOW
SPACE: DATA
SEGMENT: ?DT?F3XX_USB0_DESCRIPTOR

followed by several more linker errors.
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT

Has anybody experienced or solved something similar?

BR,
Wauschi

"After applying all changes according the ReadMe.txt"

Then no need to change it.
Copy the whole project folder to your working place on your disk.

I know there is nothing to change. I just wanted to somehow state I have even read the ReadMe but it does not work.

I just copied the folder to c:\ and everything compiled fine. It just does not link.

Maybe I should try it with a different compiler or linker version.

Modify it as follows. This modification fixes at least linker errors.

Add 'code' to the declaration of descriptors

F3xx_USB0_Descriptor.c
code const device_descriptor DEVICEDESC =
code const hid_configuration_descriptor HIDCONFIGDESC =
code const hid_report_descriptor HIDREPORTDESC =
unsigned char* code STRINGDESCTABLE [] =

Match the extern declaration to the original.

F3xx_USB0_Standard_Requests.c
//-----------------------------------------------------------------------------
// Variables
//-----------------------------------------------------------------------------
extern code const device_descriptor DEVICEDESC; // These are created in F3xx_USB0_Descriptor.h
extern unsigned char* code STRINGDESCTABLE[];

// Additional declarations for HID:
extern code const hid_configuration_descriptor HIDCONFIGDESC;
extern code const hid_report_descriptor HIDREPORTDESC;

Tsuneo

Tsuneo's recommendation on declaring the "const" variables in code space is the best way to fix this error when compiling with the newest Keil tools. We will be modifying the code example in this way for future releases.

Const
"The Cx51 Compiler conforms to the ANSI definition of const objects.

• 
  Variables declared with the const type qualifier alone are stored in the memory area
  (data, idata, xdata, and so on) associated with their definition.
• 
  Variables you want to locate in ROM must be declared with the code memory type.
  For example:
  code char test[] = "This is a text string";
  ...

"

After using "Find in Files" and replacing 'const' with 'code' the project compiles perfectly. (Just the 'const' belonging to the descriptors which I think they should be located in the ROM).

One must not forget to also add 'code' at the declaration or you will get: "ERROR L103: EXTERNAL ATTRIBUT DO NOT MATCH PUBLIC"