Boot Loader and Int Vector table reloacation

I need to move the vector table up into RAM without moving the base address of the bootloader ROM code.

Refer to the following support solution for details on one way to do this.

http://www.keil.com/support/docs/132.htm

Keil Support

I need to move the vector table up into RAM without moving the base address of the bootloader ROM code.

Refer to the following support solution for details on one way to do this.

http://www.keil.com/support/docs/132.htm

Keil Support

Is there a real code example of this method? I am fairly new to this processor and a bit confused as to how to plug this all in.

Is there a real code example of this method? I am fairly new to this processor and a bit confused as to how to plug this all in.
If, indeed you are fairly new, why do you deal with issues as complex as this. Get some wear on your '51 shoes, then come back to this issue. The way to get practice on the '51 is to use it as it is intended before "going excotic".

Erik

Fortunately I don't have much of a choice in this matter. It's what the project requires and I happen to be the resources for it at the moment. It's good to know that it's not simple though.

I did a similar thing when I had to update my firmware over usb.
In my case one interwupt was used in the update code and regular firmware and the
code hat to respond as fast as possible.

in ASM I used the following:
(note the RET instead of RETI)

extrn DATA   (USB_VECT)
extrn DATA   (V24_VECT)
CSEG at 00003h
  PUSH    USB_VECT+1
  PUSH    USB_VECT+0
  RET
CSEG at 00023
  PUSH    V24_VECT+1
  PUSH    V24_VECT+0
  RET
end

and in c
#pragma NOIV
void V24Irq(void) interrupt SIO_VECTOR
{
  ...
}
void USBIrq(void) interrupt IE0_VECTOR
{
  ...
}

UINT16 usb_vect _at_ 0x20;
UINT16 sio_vect _at_ 0x22;
void initirq(void)
{
  usb_vect = (UINT8 code *) &UsbIrq;
  sio_vect = (UINT8 code *) &V24Irq;
  EA=1;
}