Remove unnecessary keep attributes

diff --git a/techlibs/ice40/cells_sim.v b/techlibs/ice40/cells_sim.v
index fb74ea4f3e24da43f9701c95c168fdeb6dc90619..2bcab88846b4f898d0592526fbc9bbb32fd93db2 100644 (file)
--- a/techlibs/ice40/cells_sim.v
+++ b/techlibs/ice40/cells_sim.v
@@ -883,7 +883,7 @@ module SB_WARMBOOT (
 endmodule
 
 // UltraPlus feature cells
-(* blackbox, keep *)
+(* blackbox *)
 module SB_MAC16 (
        input CLK,
        input CE,
@@ -935,7 +935,7 @@ parameter A_SIGNED = 1'b0;
 parameter B_SIGNED = 1'b0;
 endmodule
 
-(* blackbox, keep *)
+(* blackbox *)
 module SB_SPRAM256KA(
        input [13:0] ADDRESS,
        input [15:0] DATAIN,
@@ -950,7 +950,7 @@ module SB_SPRAM256KA(
 );
 endmodule
 
-(* blackbox, keep *)
+(* blackbox *)
 module SB_HFOSC(
        input CLKHFPU,
        input CLKHFEN,
@@ -959,7 +959,7 @@ module SB_HFOSC(
 parameter CLKHF_DIV = "0b00";
 endmodule
 
-(* blackbox, keep *)
+(* blackbox *)
 module SB_LFOSC(
        input CLKLFPU,
        input CLKLFEN,
@@ -967,7 +967,7 @@ module SB_LFOSC(
 );
 endmodule
 
-(* blackbox, keep *)
+(* blackbox *)
 module SB_RGBA_DRV(
        input CURREN,
        input RGBLEDEN,