AT89C51ED2: Selecting external vs internal flash

Same topic, new problem:

With the ~EA pin tied low, the processor will be accessing program memory on the external PEROM. OK.

The BLBJ bit is (by default) 0. BSB is 0, SBV is FCh (default values). So the Atmel bootloader tries to run at address F800h.

My understanding is that, at this point, the processor tries to execute instruction at address F800h on the external PEROM, thinking it's running the bootloader.

My questions:
1. Am I correct that this is what is happening?
2. I want to execute at 0 on the external without programming/modifying the processor's hardware registers nor its pin connections. The only modification that can be made is to program memory (on the flash).

I tried to follow the Keil directions for relocating code, to hard-wire a long-jump to 0 at F800h, but "CSEG AT F800h" gives an error ("Expression with forward reference not permitted").

Is there an elegant solution?

Same topic, new problem:

With the ~EA pin tied low, the processor will be accessing program memory on the external PEROM. OK.

The BLBJ bit is (by default) 0. BSB is 0, SBV is FCh (default values). So the Atmel bootloader tries to run at address F800h.

My understanding is that, at this point, the processor tries to execute instruction at address F800h on the external PEROM, thinking it's running the bootloader.

My questions:
1. Am I correct that this is what is happening?
2. I want to execute at 0 on the external without programming/modifying the processor's hardware registers nor its pin connections. The only modification that can be made is to program memory (on the flash).

I tried to follow the Keil directions for relocating code, to hard-wire a long-jump to 0 at F800h, but "CSEG AT F800h" gives an error ("Expression with forward reference not permitted").

Is there an elegant solution?

Try putting a zero in front of your F800h. That may eliminate the error.

Oh. My.

Thanks.