Global pointer _gp

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originally posted by banx@Nov 14 2006, 05:05 AM

hi jskjoet,

i have a section of nvr like yours and use the __attribute__ to put stuff into it like this:

unsigned short fred __attribute__ ....

if i then try to use fred from another file with:

extern unsigned short fred;

then i get the same "can't reach...".

you have to tell the compiler that the variable is in the nvr section, which may be far away:

extern unsigned short fred __attribute__ ....

banx.

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Hi Banx

Thank you for the reply.

In my case the varibles are used from within the same module only - so no extern declaration.

Initially I found that outputting the nv_sram section after the bss segment caused a crash. This was due to a conflict with the heap that starts at the _end symbol.

After inelegantly replacing

.flash : AT (LOADADDR (.bss) + SIZEOF (.bss)

with

.flash : AT (LOADADDR (.bss) + SIZEOF (.bss) + SIZEOF (.nv_sram))

in the linker script it now works nicely as this moved the _end symbol too. Note that moving the flash segment is probably not the way to go if you&#39;re using any kind of software that rely in this.

Regards Jacob