Hi Peter,
.bss is getting an even address, 0x29e. However because of the one byte
allocation for the fixture_wall_switch file the start address symbol is getting
0x29f. I don't understand why the file is getting any allocation at all since
there are no global variables defined in that file.
It looks like I am unnecessarily putting .bss before .data in my linker script.
However, when I correct that I still see the same condition. One byte beyond
.bss is getting zeroed. Granted now it is just free memory, but it seem like a
problem that it happens.
Thanks,
Bob.
On Feb 21, 2013, at 1:29 PM, Peter Bigot <big...@acm.org> wrote:
> In the standard linker script __bss_start gets the value of . at the start of
> .bss, which immediately follows .data. .data ends with a 2-byte alignment
> instruction. I don't see how __bss_start would end up at an odd address in
> that situation.
>
> Peter
>
> On Thu, Feb 21, 2013 at 1:56 PM, Robert Henig <rhe...@redwoodsys.com> wrote:
> It looks like the bss init loop is starting one byte ahead of where it
> should. I suspect the problem is from the "src/fixture_wall_switch.o" entry
> in the map file shown below.
>
> .bss 0x0000029e 0x0 src/escape_seq.o
> .bss 0x0000029e 0x1 src/fixture_wall_switch.o
> .bss 0x0000029f 0x0 src/i2c.o
>
> Later I get:
>
> 0x0000029f PROVIDE (__bss_start, .)
>
> But __bss_start should be 0x0000029e.
>
> The net result is that the first byte in .data is zero instead of its correct
> initialized value.
>
> I confirmed that __bss_start is 0x029f and __bss_size is correct in the
> debugger.
>
> Why would "src/fixture_wall_switch.o" be allocated one byte but not show any
> symbol for that allocation?
>
> Any help? I can provide more details but I think this is the crux of the
> situation.
>
> Thanks,
> Bob.
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