[sw/spi_device] Update the usage of window space
diff --git a/sw/boot_rom/spi_device.c b/sw/boot_rom/spi_device.c
index 20222ef..7939ea3 100644
--- a/sw/boot_rom/spi_device.c
+++ b/sw/boot_rom/spi_device.c
@@ -8,7 +8,7 @@
 #include "spi_device_regs.h"
 
 #define SPI_DEVICE0_BASE_ADDR 0x40020000
-#define SPID_SRAM_ADDR SPI_DEVICE_BUFFER(SPI_DEVICE0_BASE_ADDR)
+#define SPID_SRAM_ADDR SPI_DEVICE_BUFFER(0)
 #define SPID_RXF_BASE 0x000
 #define SPID_RXF_SIZE 0x400
 #define SPID_TXF_BASE 0x600
diff --git a/sw/lib/spi_device.h b/sw/lib/spi_device.h
index 18d3278..910fb9d 100644
--- a/sw/lib/spi_device.h
+++ b/sw/lib/spi_device.h
@@ -13,7 +13,7 @@
 
 #include "spi_device_regs.h"
 
-#define SPID_SRAM_ADDR SPI_DEVICE_BUFFER(SPI_DEVICE0_BASE_ADDR)
+#define SPID_SRAM_ADDR SPI_DEVICE_BUFFER(0)
 #define SPID_RXF_BASE 0x000
 #define SPID_RXF_SIZE 0x400
 #define SPID_TXF_BASE 0x600