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RE: [avr-gcc-list] Howto put constants on fixed address
From: |
Stu Bell |
Subject: |
RE: [avr-gcc-list] Howto put constants on fixed address |
Date: |
Wed, 19 Dec 2007 10:53:25 -0700 |
I forgot to add that you can specify the linker script by using the -T
loader flag. In the make file (generated by Mfile), I added:
LDFLAGS += -T linker_script.x
Where linker_script.x is my modified linker script, which resides in the
source home directory.
Best regards,
Stu Bell
DataPlay (DPHI, Inc.)
-----Original Message-----
From: Stu Bell
Sent: Wednesday, December 19, 2007 10:26 AM
To: 'address@hidden'; address@hidden
Subject: RE: [avr-gcc-list] Howto put constants on fixed address
I have code in my bootloader that runs a CRC on the loaded code for a
sanity check. For that I need a length. Of course, that needs to be
supplied after the code is compiled, but I allocate space for it by
doing the following:
In the .c file:
/* flash code length -- this is loaded in flash by the linker and other
scripts */ const uint32_t ProgramLength __attribute__ ((section
(".length"))) = 0;
Modified linker script (This is avr<architecture>.x in
<WinAVR>\avr\lib\ldscripts - for me avr6.x):
. . .
/* Internal text space or external memory. */
.text :
{
*(.vectors)
KEEP(*(.vectors))
*(.length)
KEEP(*(.length))
/* For data that needs to reside in the lower 64k of progmem. */
*(.progmem.gcc*)
. . .
(where the .length stuff is what I added)
Give it a shot.
Best regards,
Stu Bell
DataPlay (DPHI, Inc.)
- Re: [avr-gcc-list] Howto put constants on fixed address, (continued)
- RE: [avr-gcc-list] Howto put constants on fixed address, Stu Bell, 2007/12/20
- RE: [avr-gcc-list] Howto put constants on fixed address, Weddington, Eric, 2007/12/20
- RE: [avr-gcc-list] Howto put constants on fixed address, Martin Žižka, 2007/12/20
- Re: [avr-gcc-list] Howto put constants on fixed address, David Kelly, 2007/12/20
- Re: [avr-gcc-list] Howto put constants on fixed address, Joerg Wunsch, 2007/12/24
- RE: [avr-gcc-list] Howto put constants on fixed address, Stu Bell, 2007/12/20
- RE: [avr-gcc-list] Howto put constants on fixed address,
Stu Bell <=