mainGNU Development Chain for 68HC11/68HC12 - Support: sr #102782, HC12 Bank Switching & Paging

 
 

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sr #102782: HC12 Bank Switching & Paging

Submitter:  John Pietrasik <jpietrasik>
Submitted:  Fri 30 Jan 2004 05:49:42 PM UTC
   
 
Category:  None Priority:  5 - Normal
Severity:  3 - Normal Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Operating System:  None

Thu 05 Feb 2004 12:42:01 PM UTC, comment #1: 

This request can be cancelled.  I found that the logical address and the physical address for banked code can be defined separately (yielding the desired results) as follows:

MEMORY
{
  ...
  _PAGE_30 (RX) : ORIGIN = 0x0D0000, LENGTH = 0x4000;
  ...
}

SECTIONS
{
  _page_30_physical_address = 0x308000;

  ...

  .page_30 : AT (_page_30_physical_address)
  {
    * (.page_30)
  } > _PAGE_30

  ...
}

John Pietrasik <jpietrasik>
Fri 30 Jan 2004 05:49:42 PM UTC, original submission:  

Is it possible to change the values of the constants "sym_bank_base", "page_bank_size", and "page_bank_base" in the linker script file (68HC12 Tool Chain)?

The current page and address calculation is incompatible with my current Noral BDM hardware.  Ideally, I would like define the following configuration:

sym_bank_base = 0
page_bank_size = 0x10000
page_bank_base = 0

This configuration would yield the following...

%page(sym_addr) = sym_addr >> 16;
%addr(sym_addr) = sym_addr & 0xFFFF;

John Pietrasik <jpietrasik>

 

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