gnupic: A possible bug with udata
Subject:
Re: A possible bug with udata
From:
Craig Franklin ####@####.####
Date:
6 Sep 2004 06:58:45 +0100
Message-Id: <413B0D6E.5060809@users.sourceforge.net>
I have added both features to gplink. The changes are in cvs.
Craig Franklin wrote:
> That linker script defines the 16f871 data memory as all sharebank.
>
> SHAREBANK NAME=gprnobnk0 START=0x20 END=0x6F
> SHAREBANK NAME=gprnobnk0 START=0x120 END=0x16F
>
> SHAREBANK NAME=gprnobnk1 START=0xA0 END=0xBF
> SHAREBANK NAME=gprnobnk1 START=0x1A0 END=0x1BF
>
> There are no unprotected databank definitions. Here is an example
> from the 16f877:
>
> DATABANK NAME=gpr0 START=0x20 END=0x6F
>
> The linker has a udata section to relocate, but no data sections are
> defined, so it reports no memory is available.
>
> If you change the directive from udata to udata_shr, it will work.
>
> I tested mplink and it behaves the same way.
>
> 1. I really could generate a better error message in this case.
> Maybe I should distinguish between running out of memory and not
> having any to begin with. I will put it on my list.
>
> 2. I have considered relocating udata sections to shared memory, when
> you run out of unshared memory. I really never fully considered the
> consequences. I will take another look at it.
>
> Julian Green wrote:
>
>> I have constructed a small project that reproduces the problem.
>>
>> I hope .tgz file attachments get through
>>
>> Julian
>>
>> On Sat, 4 Sep 2004, Craig Franklin wrote:
>>
>>
>>
>>> This can happen if you have used all available data memory or if the
>>> size of the section exceeds the size of one bank on the target device.
>>>
>>> If you send me your code, I can figure out what happened.
>>>
>>> If you can't send me your code, link the project with the "--debug"
>>> flag. This will print many messages about the internal operation of
>>> the
>>> linker. You might be able to figure out what is happening. Send me
>>> the
>>> debug message, I can help.
>>>
>>> Julian Green wrote:
>>>
>>>
>>>
>>>> I am using gputils-0.12.3.
>>>>
>>>> I have a project consisting of a library and a main module from
>>>> which I
>>>> call library code. However I am getting a linker error:
>>>>
>>>> error: no target memory available for section "fbw_u"
>>>>
>>>> If I add an address to the udata declararion I can make the error
>>>> go away,
>>>> but that defeats the purpose of relocatable modules.
>>>>
>>>> fbw_u udata 0x21
>>>>
>>>> Julian
>>>>
>>>>
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