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Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352)broke a
From: |
Jan Waclawek |
Subject: |
Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352)broke avr-libc build |
Date: |
Sun, 13 Jun 2010 22:15:14 +0200 |
>Regarding the linker script section names, that should certainly be
>mentioned in the description (so it eventually goes into the avr-libc
>documentation), independent of whether Eric provides a patch in the
>next version of the WinAVR successor. Can you please submit a
>paragraph for that, Jan?
>
It's all in an avrfreaks.net thread linked from
https://savannah.nongnu.org/bugs/?26365 , namely
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=705868#705868
.
Around two thirds down, search for "linker script".
Maybe a bit more narrative than standard documentation, but I wanted to spawn a
discussion first, I did not expect it will be included that soon.
._progmem_far (together with PFSTR macro and the xxx_PF() functions) is
intended to provide a relatively easy and transparent relief from a pressure on
the lower 64k FLASH by moving mainly strings to above the .data initialisers.
._progmem_segment1 etc: "The purpose of "segmented" usage is to allow for
faster and more comfortable address calculation, if we know beforehand that we
can fit all FLASH data into a 64k "segment", (segment1 is 0x10000-0x1FFFF,
segment2 is 0x20000-0x2FFFF, segment3 is 0x30000-0x3FFFF). To access them, we
still need the pgm_read_xxx_far() (and xxx_PF()) family, but we can use the
"native" pointer mechanism and then add the segment address."
Is this sufficient enough?
Jan
PS. Sorry for the late response, couldn't get to computer sooner.
- [avr-libc-dev] Inclusion of far pointer library (patch #6352) broke avr-libc build, Joerg Wunsch, 2010/06/13
- Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352) broke avr-libc build, Jan Waclawek, 2010/06/13
- Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352) broke avr-libc build, Jan Waclawek, 2010/06/13
- Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352) broke avr-libc build, Joerg Wunsch, 2010/06/13
- Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352) broke avr-libc build, Joerg Wunsch, 2010/06/13
- Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352)broke avr-libc build,
Jan Waclawek <=
- Re: [avr-libc-dev] Inclusion of far pointer library (patch #6352)broke avr-libc build, Joerg Wunsch, 2010/06/14
- RE: [avr-libc-dev] Inclusion of far pointer library (patch#6352)broke avr-libc build, Weddington, Eric, 2010/06/14
- RE: [avr-libc-dev] Inclusion of far pointer library (patch#6352)brokeavr-libc build, Weddington, Eric, 2010/06/14
- Re: [avr-libc-dev] Inclusion of far pointer library (patch#6352)broke avr-libc build, Joerg Wunsch, 2010/06/14
- RE: [avr-libc-dev] Inclusion of far pointer library(patch#6352)broke avr-libc build, Weddington, Eric, 2010/06/14
- RE: [avr-libc-dev] Inclusion of far pointer library (patch#6352)broke avr-libc build, Weddington, Eric, 2010/06/14