diff --git a/hw/top_earlgrey/data/top_earlgrey_pkg.sv.tpl b/hw/top_earlgrey/data/top_earlgrey_pkg.sv.tpl
index 7af8a85..054d42b 100644
--- a/hw/top_earlgrey/data/top_earlgrey_pkg.sv.tpl
+++ b/hw/top_earlgrey/data/top_earlgrey_pkg.sv.tpl
@@ -21,14 +21,30 @@
             top["name"], sig["name"], start_idx))
 %>\
 package top_${top["name"]}_pkg;
+% for name, region in helper.modules():
+  /**
+   * Peripheral base address for ${name} in top ${top["name"]}.
+   */
+  parameter int unsigned ${region.base_addr_name().as_c_define()} = 32'h${region.base_addr[2:]};
 
-  // Base addresses of all peripherals.
-  % for m in top["module"]:
-  ${"parameter logic [31:0] TOP_{}_{}_BASE_ADDR = 32'h{}".format(top["name"].upper(),
-                                                                 m["name"].upper(),
-                                                                 m["base_addr"][2:])};
-  % endfor
+  /**
+   * Peripheral size in bytes for ${name} in top ${top["name"]}.
+   */
+  parameter int unsigned ${region.size_bytes_name().as_c_define()} = 32'h${region.size_bytes[2:]};
 
+% endfor
+% for name, region in helper.memories():
+  /**
+   * Memory base address for ${name} in top ${top["name"]}.
+   */
+  parameter int unsigned ${region.base_addr_name().as_c_define()} = 32'h${region.base_addr[2:]};
+
+  /**
+   * Memory size for ${name} in top ${top["name"]}.
+   */
+  parameter int unsigned ${region.size_bytes_name().as_c_define()} = 32'h${region.size_bytes[2:]};
+
+% endfor
   // Enumeration for DIO pins.
   typedef enum {
   <% pin_cnt = 0 %>\
diff --git a/hw/top_earlgrey/rtl/autogen/top_earlgrey_pkg.sv b/hw/top_earlgrey/rtl/autogen/top_earlgrey_pkg.sv
index a701200..9b1e5d3 100644
--- a/hw/top_earlgrey/rtl/autogen/top_earlgrey_pkg.sv
+++ b/hw/top_earlgrey/rtl/autogen/top_earlgrey_pkg.sv
@@ -3,28 +3,245 @@
 // SPDX-License-Identifier: Apache-2.0
 
 package top_earlgrey_pkg;
+  /**
+   * Peripheral base address for uart in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_UART_BASE_ADDR = 32'h40000000;
 
-  // Base addresses of all peripherals.
-  parameter logic [31:0] TOP_EARLGREY_UART_BASE_ADDR = 32'h40000000;
-  parameter logic [31:0] TOP_EARLGREY_GPIO_BASE_ADDR = 32'h40010000;
-  parameter logic [31:0] TOP_EARLGREY_SPI_DEVICE_BASE_ADDR = 32'h40020000;
-  parameter logic [31:0] TOP_EARLGREY_FLASH_CTRL_BASE_ADDR = 32'h40030000;
-  parameter logic [31:0] TOP_EARLGREY_RV_TIMER_BASE_ADDR = 32'h40080000;
-  parameter logic [31:0] TOP_EARLGREY_AES_BASE_ADDR = 32'h40110000;
-  parameter logic [31:0] TOP_EARLGREY_HMAC_BASE_ADDR = 32'h40120000;
-  parameter logic [31:0] TOP_EARLGREY_RV_PLIC_BASE_ADDR = 32'h40090000;
-  parameter logic [31:0] TOP_EARLGREY_PINMUX_BASE_ADDR = 32'h40070000;
-  parameter logic [31:0] TOP_EARLGREY_PADCTRL_BASE_ADDR = 32'h40160000;
-  parameter logic [31:0] TOP_EARLGREY_ALERT_HANDLER_BASE_ADDR = 32'h40130000;
-  parameter logic [31:0] TOP_EARLGREY_PWRMGR_BASE_ADDR = 32'h400A0000;
-  parameter logic [31:0] TOP_EARLGREY_RSTMGR_BASE_ADDR = 32'h400B0000;
-  parameter logic [31:0] TOP_EARLGREY_CLKMGR_BASE_ADDR = 32'h400C0000;
-  parameter logic [31:0] TOP_EARLGREY_NMI_GEN_BASE_ADDR = 32'h40140000;
-  parameter logic [31:0] TOP_EARLGREY_USBDEV_BASE_ADDR = 32'h40150000;
-  parameter logic [31:0] TOP_EARLGREY_SENSOR_CTRL_BASE_ADDR = 32'h40170000;
-  parameter logic [31:0] TOP_EARLGREY_KEYMGR_BASE_ADDR = 32'h401a0000;
-  parameter logic [31:0] TOP_EARLGREY_OTP_CTRL_BASE_ADDR = 32'h401b0000;
-  parameter logic [31:0] TOP_EARLGREY_OTBN_BASE_ADDR = 32'h50000000;
+  /**
+   * Peripheral size in bytes for uart in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_UART_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for gpio in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_GPIO_BASE_ADDR = 32'h40010000;
+
+  /**
+   * Peripheral size in bytes for gpio in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_GPIO_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for spi_device in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_SPI_DEVICE_BASE_ADDR = 32'h40020000;
+
+  /**
+   * Peripheral size in bytes for spi_device in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_SPI_DEVICE_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for flash_ctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_FLASH_CTRL_BASE_ADDR = 32'h40030000;
+
+  /**
+   * Peripheral size in bytes for flash_ctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_FLASH_CTRL_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for rv_timer in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RV_TIMER_BASE_ADDR = 32'h40080000;
+
+  /**
+   * Peripheral size in bytes for rv_timer in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RV_TIMER_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for aes in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_AES_BASE_ADDR = 32'h40110000;
+
+  /**
+   * Peripheral size in bytes for aes in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_AES_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for hmac in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_HMAC_BASE_ADDR = 32'h40120000;
+
+  /**
+   * Peripheral size in bytes for hmac in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_HMAC_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for rv_plic in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RV_PLIC_BASE_ADDR = 32'h40090000;
+
+  /**
+   * Peripheral size in bytes for rv_plic in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RV_PLIC_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for pinmux in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_PINMUX_BASE_ADDR = 32'h40070000;
+
+  /**
+   * Peripheral size in bytes for pinmux in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_PINMUX_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for padctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_PADCTRL_BASE_ADDR = 32'h40160000;
+
+  /**
+   * Peripheral size in bytes for padctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_PADCTRL_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for alert_handler in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_ALERT_HANDLER_BASE_ADDR = 32'h40130000;
+
+  /**
+   * Peripheral size in bytes for alert_handler in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_ALERT_HANDLER_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for pwrmgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_PWRMGR_BASE_ADDR = 32'h400A0000;
+
+  /**
+   * Peripheral size in bytes for pwrmgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_PWRMGR_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for rstmgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RSTMGR_BASE_ADDR = 32'h400B0000;
+
+  /**
+   * Peripheral size in bytes for rstmgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RSTMGR_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for clkmgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_CLKMGR_BASE_ADDR = 32'h400C0000;
+
+  /**
+   * Peripheral size in bytes for clkmgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_CLKMGR_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for nmi_gen in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_NMI_GEN_BASE_ADDR = 32'h40140000;
+
+  /**
+   * Peripheral size in bytes for nmi_gen in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_NMI_GEN_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for usbdev in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_USBDEV_BASE_ADDR = 32'h40150000;
+
+  /**
+   * Peripheral size in bytes for usbdev in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_USBDEV_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for sensor_ctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_SENSOR_CTRL_BASE_ADDR = 32'h40170000;
+
+  /**
+   * Peripheral size in bytes for sensor_ctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_SENSOR_CTRL_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for keymgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_KEYMGR_BASE_ADDR = 32'h401a0000;
+
+  /**
+   * Peripheral size in bytes for keymgr in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_KEYMGR_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Peripheral base address for otp_ctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_OTP_CTRL_BASE_ADDR = 32'h401b0000;
+
+  /**
+   * Peripheral size in bytes for otp_ctrl in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_OTP_CTRL_SIZE_BYTES = 32'h2000;
+
+  /**
+   * Peripheral base address for otbn in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_OTBN_BASE_ADDR = 32'h50000000;
+
+  /**
+   * Peripheral size in bytes for otbn in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_OTBN_SIZE_BYTES = 32'h400000;
+
+  /**
+   * Memory base address for rom in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_ROM_BASE_ADDR = 32'h00008000;
+
+  /**
+   * Memory size for rom in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_ROM_SIZE_BYTES = 32'h4000;
+
+  /**
+   * Memory base address for ram_main in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RAM_MAIN_BASE_ADDR = 32'h10000000;
+
+  /**
+   * Memory size for ram_main in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RAM_MAIN_SIZE_BYTES = 32'h10000;
+
+  /**
+   * Memory base address for ram_ret in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RAM_RET_BASE_ADDR = 32'h18000000;
+
+  /**
+   * Memory size for ram_ret in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_RAM_RET_SIZE_BYTES = 32'h1000;
+
+  /**
+   * Memory base address for eflash in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_EFLASH_BASE_ADDR = 32'h20000000;
+
+  /**
+   * Memory size for eflash in top earlgrey.
+   */
+  parameter int unsigned TOP_EARLGREY_EFLASH_SIZE_BYTES = 32'h80000;
 
   // Enumeration for DIO pins.
   typedef enum {
diff --git a/hw/top_earlgrey/top_earlgrey.core b/hw/top_earlgrey/top_earlgrey.core
index 4a81bb6..629156a 100644
--- a/hw/top_earlgrey/top_earlgrey.core
+++ b/hw/top_earlgrey/top_earlgrey.core
@@ -42,7 +42,6 @@
       - lowrisc:tlul:headers
       - lowrisc:prim:all
     files:
-      - rtl/autogen/top_earlgrey_pkg.sv
       - rtl/autogen/top_earlgrey.sv
     file_type: systemVerilogSource
 
diff --git a/hw/top_earlgrey/top_earlgrey_artys7-50.core b/hw/top_earlgrey/top_earlgrey_artys7-50.core
index 0f0b38e..1f88ff9 100644
--- a/hw/top_earlgrey/top_earlgrey_artys7-50.core
+++ b/hw/top_earlgrey/top_earlgrey_artys7-50.core
@@ -8,6 +8,7 @@
   files_rtl_artys7:
     depend:
       - lowrisc:systems:top_earlgrey:0.1
+      - lowrisc:systems:top_earlgrey_pkg
       - lowrisc:tool:opentitan_earlgrey_flash_size_check:0.1
     files:
       - rtl/clkgen_xil7series.sv
diff --git a/hw/top_earlgrey/top_earlgrey_asic.core b/hw/top_earlgrey/top_earlgrey_asic.core
index d9eb657..f47bf57 100644
--- a/hw/top_earlgrey/top_earlgrey_asic.core
+++ b/hw/top_earlgrey/top_earlgrey_asic.core
@@ -8,6 +8,7 @@
   files_rtl:
     depend:
       - lowrisc:systems:top_earlgrey:0.1
+      - lowrisc:systems:top_earlgrey_pkg
       - lowrisc:systems:ast_wrapper
       - lowrisc:ibex:ibex_tracer:0.1
     files:
diff --git a/hw/top_earlgrey/top_earlgrey_cw305.core b/hw/top_earlgrey/top_earlgrey_cw305.core
index 67aa209..e849166 100644
--- a/hw/top_earlgrey/top_earlgrey_cw305.core
+++ b/hw/top_earlgrey/top_earlgrey_cw305.core
@@ -9,6 +9,7 @@
   files_rtl_cw305:
     depend:
       - lowrisc:systems:top_earlgrey:0.1
+      - lowrisc:systems:top_earlgrey_pkg
       - lowrisc:tool:opentitan_earlgrey_flash_size_check:0.1
     files:
       - rtl/clkgen_xil7series.sv
diff --git a/hw/top_earlgrey/top_earlgrey_nexysvideo.core b/hw/top_earlgrey/top_earlgrey_nexysvideo.core
index e3cd9ab..2139657 100644
--- a/hw/top_earlgrey/top_earlgrey_nexysvideo.core
+++ b/hw/top_earlgrey/top_earlgrey_nexysvideo.core
@@ -8,6 +8,7 @@
   files_rtl_nexysvideo:
     depend:
       - lowrisc:systems:top_earlgrey:0.1
+      - lowrisc:systems:top_earlgrey_pkg
     files:
       - rtl/clkgen_xil7series.sv
       - rtl/top_earlgrey_nexysvideo.sv
diff --git a/hw/top_earlgrey/top_earlgrey_pkg.core b/hw/top_earlgrey/top_earlgrey_pkg.core
new file mode 100644
index 0000000..7795569
--- /dev/null
+++ b/hw/top_earlgrey/top_earlgrey_pkg.core
@@ -0,0 +1,16 @@
+CAPI=2:
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+name: "lowrisc:systems:top_earlgrey_pkg:0.1"
+description: "Autogenerated top_earlgrey_pkg used in RTL and DV."
+filesets:
+  files_rtl:
+    files:
+      - rtl/autogen/top_earlgrey_pkg.sv
+    file_type: systemVerilogSource
+
+targets:
+  default: &default_target
+    filesets:
+      - files_rtl
diff --git a/hw/top_earlgrey/top_earlgrey_verilator.core b/hw/top_earlgrey/top_earlgrey_verilator.core
index 34b47b4..3aa5dc3 100644
--- a/hw/top_earlgrey/top_earlgrey_verilator.core
+++ b/hw/top_earlgrey/top_earlgrey_verilator.core
@@ -8,6 +8,7 @@
   files_sim_verilator:
     depend:
       - lowrisc:systems:top_earlgrey:0.1
+      - lowrisc:systems:top_earlgrey_pkg
       - lowrisc:dv_dpi:uartdpi
       - lowrisc:dv_dpi:gpiodpi
       - lowrisc:dv_dpi:jtagdpi