[openrisc] Cell not translated

[luolei2000@hotmail.com]

Hi, All,
 
I want to use OpenRisc as the netlist for my project. When I try to 
compile and synthsis, there is warning:

Warning: 
Cell 'or1200_immu_top/or1200_immu_tlb/itlb_mr_ram/ramb4_s16_0' 
(RAMB4_S16) not translated. (TRANS-1)
Warning: 
Cell 'or1200_immu_top/or1200_immu_tlb/itlb_tr_ram/ramb4_s16_0' 
(RAMB4_S16_1) not translated. (TRANS-1)
Warning: 
Cell 'or1200_immu_top/or1200_immu_tlb/itlb_tr_ram/ramb4_s16_1' 
(RAMB4_S16_param_1) not translated. (TRANS-1)
Warning: Cell 'or1200_ic_top/or1200_ic_ram/ic_ram0/ramb4_s4_0' 
(RAMB4_S4) not translated. (TRANS-1)
Warning: Cell 'or1200_ic_top/or1200_ic_ram/ic_ram0/ramb4_s4_1' 
(RAMB4_S4_param_1) not translated. (TRANS-1)
Warning: Cell 'or1200_ic_top/or1200_ic_ram/ic_ram0/ramb4_s4_2' 
(RAMB4_S4_param_2) not translated.
.....
 
Anyone can tell me why and how to make it synthsizable?
 
Is OpenRisc1200 synthsizable?
 
Thanks in advance.
 
Lei
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