I copied the memory.x file from the shared install location, and I created a
new section called "newconfig" and shrunk the available ROM space. Code is
placed into ROM like normal, but by using the __attribute__((section ... stuff
you can specify the data be placed into that specific location. In my case,
all my code sits before FA00 and all my constants are placed into FA00 and
later. If you have multiple variables you want organized together in a
specific order, consider a struct to keep them all together so you don't need
to create a section for each variable. You can place the struct at the start
address and from there all the subsequent variables fall into place.
The following is an example of my modified memory.x file.
MEMORY {
sfr : ORIGIN = 0x0000, LENGTH = 0x0010 /* END=0x0010, size 16 */
peripheral_8bit : ORIGIN = 0x0010, LENGTH = 0x00f0 /* END=0x0100, size 240 */
peripheral_16bit : ORIGIN = 0x0100, LENGTH = 0x0100 /* END=0x0200, size 256 */
ram_mirror (wx) : ORIGIN = 0x0200, LENGTH = 0x0800 /* END=0x0a00, size 2K */
infomem : ORIGIN = 0x1000, LENGTH = 0x0100 /* END=0x1100, size 256
as 2 128-byte segments */
infob : ORIGIN = 0x1000, LENGTH = 0x0080 /* END=0x1080, size 128 */
infoa : ORIGIN = 0x1080, LENGTH = 0x0080 /* END=0x1100, size 128 */
ram (wx) : ORIGIN = 0x1100, LENGTH = 0x1400 /* END=0x2500, size 5K */
/* rom (rx) : ORIGIN = 0x2500, LENGTH = 0xdae0 */ /* END=0xffe0, size
56032 */
rom (rx) : ORIGIN = 0x2500, LENGTH = 0xd500
newconfig (r) : ORIGIN = 0xFA00, LENGTH = 0x05e0
vectors : ORIGIN = 0xffe0, LENGTH = 0x0020 /* END=0x10000, size 32
as 16 2-byte segments */
/* Remaining banks are absent */
bsl : ORIGIN = 0x0000, LENGTH = 0x0000
infoc : ORIGIN = 0x0000, LENGTH = 0x0000
infod : ORIGIN = 0x0000, LENGTH = 0x0000
ram2 (wx) : ORIGIN = 0x0000, LENGTH = 0x0000
usbram (wx) : ORIGIN = 0x0000, LENGTH = 0x0000
far_rom : ORIGIN = 0x00000000, LENGTH = 0x00000000
}
-----Original Message-----
From: Wayne Uroda [mailto:[email protected]]
Sent: Monday, January 28, 2013 6:38 PM
To: [email protected]
Subject: Re: [Mspgcc-users] Fixing const char string in memory using linker
script
Hi Bob, I do the following:
in my linker script, I have something like
.text :
{
*(.swversection)
// no need to manually advance `.'
// other input sections follow
} > text
Then in the code:
__attribute__ ((section(".swversection"))) const char swVer[] = ...;
I hope this helps
- Wayne
On 29/01/2013 8:11 AM, Robert Henig wrote:
> I am trying to force a string into a fixed location using a linker script.
> The script contains:
>
> .text :
> {
> swVer = .;
> . += 8;
> }
>
> The code contains:
>
> const char swVer[] = "01.0904\0";
>
> After compiling the .map file shows that eight bytes are reserved at 0xc000
> and a symbol named swVer at that location. As expected .init0 is at 0xc008.
> However the linker does not initialize the memory with the version string. It
> is initialized to zeros. Anyone have any idea how to make this work?
>
> Thanks,
> Bob.
>
>
>
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