fpga: add new symbol for fpga_loadb

Adding new symbol for the fpga loadb command which is exclusive to
Xilinx. Default value is y for backward compatibility.

Clarify the type of file used for fpga programming commands

Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@amd.com>
Link: https://lore.kernel.org/r/20250121130138.1999916-6-ibai.erkiaga-elorza@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index d59a000..1f9b269 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1178,19 +1178,26 @@
 	help
 	  FPGA support.
 
+config CMD_FPGA_LOADB
+	bool "fpga loadb - load bitstream file"
+	default y
+	depends on CMD_FPGA && FPGA_XILINX
+	help
+	  Supports loading an FPGA device from a bitstream file (.BIT)
+
 config CMD_FPGA_LOADP
 	bool "fpga loadp - load partial bitstream"
 	depends on CMD_FPGA
 	help
-	  Supports loading an FPGA device from a bitstream buffer containing
-	  a partial bitstream.
+	  Supports loading an FPGA device from a bitstream buffer (.BIN)
+	  containing a partial bitstream.
 
 config CMD_FPGA_LOADBP
-	bool "fpga loadbp - load partial bitstream"
+	bool "fpga loadbp - load partial bitstream file"
 	depends on CMD_FPGA && FPGA_XILINX
 	help
-	  Supports loading an FPGA device from a bitstream buffer containing
-	  a partial bitstream.
+	  Supports loading an FPGA device from a bitstream file (.BIT)
+	  containing a partial bitstream.
 
 config CMD_FPGA_LOADFS
 	bool "fpga loadfs - load bitstream from FAT filesystem"