Yes, I know. But I don´t find a way set an arbitrary
memory range (say the interval reserved to CAN)
to data variables. I can´t see how the methods you
mentioned can help me.

what I would like to do is to use more memory
besides the standard 256b scratch pad to my data
variables, without the burden of specifying absolute
address....

I need to say "I´m not using the memory from
XXXX to XXXX and it is inside the chip so please
use it as DATA since its very fast"

PS: The interval assigned to the "use on chip SRAM"
option is already being used for network buffers and
only correspond to a valid SRAM location in the
default memory mapping.