Thanks Viswanath,
I noticed one error before that:
ERROR: ExpansionError during parsing /home/tuanpham/imx-yocto-bsp/sources/poky/meta/recipes-graphics/images/core-image-weston.bb
...
... [Errno 12] Cannot allocate memory
This is due to not enough RAM. But some how the build is still running and later it throws that error when compiling binutils_2.30.
I am not sure if they are linked together or not, but I discarded the build folder, increase RAM and started fresh build, it then completes with no error.
Thanks.