From fdcac08fc97bd049a6d616ea93822341efa9b6aa Mon Sep 17 00:00:00 2001
From: vintagepc <53943260+vintagepc@users.noreply.github.com>
Date: Wed, 22 Dec 2021 06:21:43 -0500
Subject: [PATCH] 99 extra flash ram (#100)

* #99 - proper deprecation
* support -m arg
* option to expand flash storage
---
 hw/arm/prusa/prusa-mini.c              | 27 ++++++++++++--------------
 hw/arm/prusa/stm32f407/stm32f407_soc.c |  4 +++-
 hw/arm/prusa/stm32f407/stm32f407_soc.h |  8 +++++---
 3 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/hw/arm/prusa/prusa-mini.c b/hw/arm/prusa/prusa-mini.c
index 1e568f1992..cf35c5f4b8 100644
--- a/hw/arm/prusa/prusa-mini.c
+++ b/hw/arm/prusa/prusa-mini.c
@@ -44,12 +44,17 @@ static void prusa_mini_init(MachineState *machine)
 
     dev = qdev_new(TYPE_STM32F407_SOC);
     qdev_prop_set_string(dev, "cpu-type", ARM_CPU_TYPE_NAME("cortex-m4"));
+    qdev_prop_set_uint32(dev,"sram-size", machine->ram_size);
     sysbus_realize(SYS_BUS_DEVICE(dev), &error_fatal);
     STM32F407State *SOC = STM32F407_SOC(dev);
     // We (ab)use the kernel command line to piggyback custom arguments into QEMU. 
     // Parse those now. 
     arghelper_setargs(machine->kernel_cmdline);
-    
+    int default_flash_size = FLASH_SIZE;
+    if (arghelper_is_arg("4x_flash"))
+    {
+        default_flash_size <<=2; // quadruple the flash size for debug code.
+    }
     if (arghelper_is_arg("appendix")) {
         SOC->gpio[GPIO_A].idr_mask |= 0x2000;
     }
@@ -71,13 +76,13 @@ static void prusa_mini_init(MachineState *machine)
             load_image_targphys(machine->kernel_filename,0x20000-64,get_image_size(machine->kernel_filename));
             armv7m_load_kernel(ARM_CPU(first_cpu),
                 BOOTLOADER_IMAGE,
-                FLASH_SIZE);
+                default_flash_size);
         } 
         else // Raw bin or ELF file, load directly.
         {
             armv7m_load_kernel(ARM_CPU(first_cpu),
                             machine->kernel_filename,
-                            FLASH_SIZE);
+                            default_flash_size);
         }
     }
 
@@ -314,25 +319,17 @@ static void prusa_mini_init(MachineState *machine)
 
 static void prusa_mini_machine_init(MachineClass *mc)
 {
-    mc->desc = "Prusa Mini Board";
+    mc->desc = "Prusa Mini";
     mc->init = prusa_mini_init;
+    mc->default_ram_size = F407_SRAM_SIZE;
 }
 
 DEFINE_MACHINE("prusa-mini", prusa_mini_machine_init)
 
-
-// TODO - remove this at some point in the future...
-
-static void buddy_init(MachineState *machine)
-{
-    error_setg(&error_fatal, "-machine prusabuddy has been deprecated. Please use -machine prusa-mini instead.\n");
-};
-
-
 static void buddy_machine_init(MachineClass *mc)
 {
-    mc->desc = "Prusa Mini Board (Deprecated)";
-    mc->init = buddy_init;
+    mc->desc = "Prusa Mini Board";
+    mc->deprecation_reason = "prusabuddy has been deprecated because it's a board, not a machine. Use -machine prusa-mini instead";
 }
 
 DEFINE_MACHINE("prusabuddy", buddy_machine_init)
diff --git a/hw/arm/prusa/stm32f407/stm32f407_soc.c b/hw/arm/prusa/stm32f407/stm32f407_soc.c
index 72e506c424..bc4c59aaa7 100644
--- a/hw/arm/prusa/stm32f407/stm32f407_soc.c
+++ b/hw/arm/prusa/stm32f407/stm32f407_soc.c
@@ -33,6 +33,7 @@
 #include "net/net.h"
 #include "hw/i2c/smbus_eeprom.h"
 #include "exec/ramblock.h"
+#include "hw/qdev-properties.h"
 #define SYSCFG_ADD                     0x40013800
 static const uint32_t usart_addr[] = { 0x40011000, 0x40004400, 0x40004800,
                                        0x40004C00, 0x40005000, 0x40011400,
@@ -194,7 +195,7 @@ static void stm32f407_soc_realize(DeviceState *dev_soc, Error **errp)
     memory_region_add_subregion(system_memory, FLASH_BASE_ADDRESS, &s->flash);
     memory_region_add_subregion(system_memory, 0, &s->flash_alias);
 
-    memory_region_init_ram(&s->sram, NULL, "STM32F407.sram", SRAM_SIZE,
+    memory_region_init_ram(&s->sram, NULL, "STM32F407.sram", s->ram_size,
                            &err);
     if (err != NULL) {
         error_propagate(errp, err);
@@ -560,6 +561,7 @@ static void stm32f407_soc_realize(DeviceState *dev_soc, Error **errp)
 
 static Property stm32f407_soc_properties[] = {
     DEFINE_PROP_STRING("cpu-type", STM32F407State, cpu_type),
+    DEFINE_PROP_UINT32("sram-size",STM32F407State, ram_size, 192*KiB),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/arm/prusa/stm32f407/stm32f407_soc.h b/hw/arm/prusa/stm32f407/stm32f407_soc.h
index 4cc40458a3..9a6477505e 100644
--- a/hw/arm/prusa/stm32f407/stm32f407_soc.h
+++ b/hw/arm/prusa/stm32f407/stm32f407_soc.h
@@ -28,7 +28,7 @@
 
 #include "hw/misc/stm32f4xx_syscfg.h"
 #include "hw/timer/stm32f2xx_timer.h"
-// #include "hw/char/stm32f2xx_usart.h"
+#include "qemu/units.h"
 #include "hw/misc/stm32f4xx_exti.h"
 #include "hw/or-irq.h"
 #include "stm32f4xx_adc.h"
@@ -64,9 +64,9 @@ OBJECT_DECLARE_SIMPLE_TYPE(STM32F407State, STM32F407_SOC)
 #define STM_NUM_DMAS 2
 
 #define FLASH_BASE_ADDRESS 0x08000000
-#define FLASH_SIZE (1024 * 1024)
+#define FLASH_SIZE (1U *MiB)
 #define SRAM_BASE_ADDRESS 0x20000000
-#define SRAM_SIZE (192 * 1024)
+#define F407_SRAM_SIZE (192 * KiB)
 
 
 // Convenience enum. 
@@ -135,6 +135,8 @@ struct STM32F407State {
     MemoryRegion ccmsram;
     MemoryRegion temp_usb;
 
+    uint32_t ram_size;
+
 };
 
 #endif