please share steps to download and setup latest pdk. I am getting empty directory after clone

gf180mcu-pdk/libraries/gf180mcu_fd_sc_mcu7t5v0/latest

git submodule update --init --recursive

for an already cloned repo or

git clone --recurse-submodules

otherwise

First option throws error

git submodule update --init --recursive
fatal: No url found for submodule path 'libraries/gf180mcu_fd_bd_sram/latest' in .gitmodules

2nd option working fine. Thanks