init_spifi command working !
.constdata section needed to be copied in local SRAM.
However, this section appears in u-boot (elf file) when we use the external files to init spifi (see common/spifi). These files are provided by LPCware developer George Romaniuk (see http://www.lpcware.com/content/contribproj/spifitest).
When just declaring variables needed and calling pSpifi->init_spifi(...) in my command, there is no .constdata section appearing.
Still working on it