[U-Boot] undefine reference to `__bss_end__' error
Hi all.
I'm trying to upgrade my u-boot from 16 May 2009 release (out of tree customized version) to the release version December 2011. This is for powerpc MPC8349. I feel I’m very close to having U-boot successfully built, but I’m getting a symbol error at the end of the final link:
arch/powerpc/cpu/mpc83xx/start.o:(.got2+0x8): undefined reference to `__bss_end__' arch/powerpc/lib/libpowerpc.o:(.got2+0x54): undefined reference to `__bss_end__'
I googled around and saw (perhaps unrelated) that in some cases, the symbol `__bss_end__' may not be defined. So, in /arch/powerpc/mpc83xx/Start.s and arch/powerpc/lib/board.c, I manually changed `__bss_end__' to `_end'. However, I now get the following error:
arch/powerpc/cpu/mpc83xx/start.o:(.got2+0x8): undefined reference to `_end' arch/powerpc/lib/libpowerpc.o:(.got2+0x54): undefined reference to `_end'
So, my question is, is my problem a basic definition of these symbols, and if so, how to define `__bss_end__' or ‘_end’? (and where is the best place to put the definition)?
Thanks in advance, Will
Hi Will,
On Mon, Mar 12, 2012 at 3:13 PM, Will Khan willk@optiscan.com wrote:
Hi all.
I'm trying to upgrade my u-boot from 16 May 2009 release (out of tree customized version) to the release version December 2011. This is for powerpc MPC8349. I feel I’m very close to having U-boot successfully built, but I’m getting a symbol error at the end of the final link:
arch/powerpc/cpu/mpc83xx/start.o:(.got2+0x8): undefined reference to `__bss_end__' arch/powerpc/lib/libpowerpc.o:(.got2+0x54): undefined reference to `__bss_end__'
I googled around and saw (perhaps unrelated) that in some cases, the symbol `__bss_end__' may not be defined. So, in /arch/powerpc/mpc83xx/Start.s and arch/powerpc/lib/board.c, I manually changed `__bss_end__' to `_end'. However, I now get the following error:
arch/powerpc/cpu/mpc83xx/start.o:(.got2+0x8): undefined reference to `_end' arch/powerpc/lib/libpowerpc.o:(.got2+0x54): undefined reference to `_end'
So, my question is, is my problem a basic definition of these symbols, and if so, how to define `__bss_end__' or ‘_end’? (and where is the best place to put the definition)?
Well, _bss_end__ should be defined in the link script - which might be arch/powerpc/cpu/*/u-boot.lds. But if you have a special link script for your board then you might need to adjust it. In some places this symbol is called __bss_end.
But _end is a different symbol, so you shouldn't change one into the other.
Regards, Simon
Thanks in advance, Will
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
On Mon, Mar 12, 2012 at 3:13 PM, Will Khan willk@optiscan.com wrote:
...
I googled around and saw (perhaps unrelated) that in some cases, the
symbol `__bss_end__' may not be defined. So, in /arch/powerpc/mpc83xx/Start.s and arch/powerpc/lib/board.c, I manually changed `__bss_end__' to `_end'. However, I now get the following error:
arch/powerpc/cpu/mpc83xx/start.o:(.got2+0x8): undefined reference to
`_end'
arch/powerpc/lib/libpowerpc.o:(.got2+0x54): undefined reference to
`_end'
So, my question is, is my problem a basic definition of these
symbols, and if so, how to define `__bss_end__' or '_end'? (and where is the best place to put the definition)?
Well, _bss_end__ should be defined in the link script - which might be arch/powerpc/cpu/*/u-boot.lds. But if you have a special link script for your board then you might need to adjust it. In some places this symbol is called __bss_end.
But _end is a different symbol, so you shouldn't change one into the other.
Regards, Simon
Hi Simon. Thanks -it worked! It looks like in arch/powerpc/cpu/*/u-boot.lds, "__bss_end__ = . ;" got removed along the way. I put it back in, and it built fine. Will
Hi Will,
On Tue, Mar 13, 2012 at 2:17 PM, Will Khan willk@optiscan.com wrote:
On Mon, Mar 12, 2012 at 3:13 PM, Will Khan willk@optiscan.com wrote:
...
I googled around and saw (perhaps unrelated) that in some cases, the
symbol `__bss_end__' may not be defined. So, in /arch/powerpc/mpc83xx/Start.s and arch/powerpc/lib/board.c, I manually changed `__bss_end__' to `_end'. However, I now get the following error:
arch/powerpc/cpu/mpc83xx/start.o:(.got2+0x8): undefined reference to
`_end'
arch/powerpc/lib/libpowerpc.o:(.got2+0x54): undefined reference to
`_end'
So, my question is, is my problem a basic definition of these
symbols, and if so, how to define `__bss_end__' or '_end'? (and where is the best place to put the definition)?
Well, _bss_end__ should be defined in the link script - which might be arch/powerpc/cpu/*/u-boot.lds. But if you have a special link script for your board then you might need to adjust it. In some places this symbol is called __bss_end.
But _end is a different symbol, so you shouldn't change one into the other.
Regards, Simon
Hi Simon. Thanks -it worked! It looks like in arch/powerpc/cpu/*/u-boot.lds, "__bss_end__ = . ;" got removed along the way. I put it back in, and it built fine.
OK, pleased to hear it!
Regards, Simon
Will _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
participants (2)
-
Simon Glass -
Will Khan