How to change memory mapping start address at Keil with 8051 processor

Question

env

• IDE : Keil uVision
• chip : ABOV MC94F1102A(8051 processor)
• language : C

detail

When I downloaded the program to the board, it didn't work. I reviewed the memory mapping tables.

I found the startup address was 0x800, but the memory mapping is 0x000~0x7ff.

So I changed the linker control string from:

PRINT(".\asd.m51") RAMSIZE(256) 

I changed RAMSIZE(256) to RAMSIZE(128) and add memory limiting string 'CODE(0X0000-0X07FF)':

PRINT(".\asd.m51") RAMSIZE(128) CODE(0X0000-0X07FF)

But it still maps to address over 0x800 and returns this error:

*** ERROR L107: ADDRESS SPACE OVERFLOW 

I also change other settings:

What should I do?

data_sheet

• MC94F1102A
• 8051
• m8051ew

Answer 1

Apparently you are using the evaluation version of the development kit.

The relevant page "Limitations" lists (among others) this restriction:

C51 Evaluation Tools

• Programs start at offset 0x0800. Programs generated with the evaluation software may not be programmed into single-chip devices with less than 2 Kbytes of on-chip ROM.

There is no way around it. So you need to buy a license and install it, if you urgently want to use Keil C51.

Or you use another compiler (and editor/IDE). Unfortunately (for you) recommendations are off-topic here, but if you use your web fu with "open source c compiler for 8051", I'm sure you will find some suitable compiler system.