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-Wrong initial value of stack pointer on AVR devices
-Description of problem:
-The initial value of stack pointer of AVR MCUs should be RAMEND (address of the end of their RAM), but QEMU initialize them to 0.
-
-`qemu-system-avr -machine help` lists 4 flavors of MCUs which are ATmega168, ATmega2560, ATmega1280, ATmega328P. According to their datasheets, the stack pointer should be initialized as follows on reset.
-
-- [ATmega168](https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-9365-Automotive-Microcontrollers-ATmega88-ATmega168_Datasheet.pdf#page=12): RAMEND (which is 0x04FF)
-- [ATmega2560 and ATmega1280](https://ww1.microchip.com/downloads/en/devicedoc/atmel-2549-8-bit-avr-microcontroller-atmega640-1280-1281-2560-2561_datasheet.pdf#page=15): RAMEND (which is 0x21FF)
-- [ATmega328P](https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ProductDocuments/DataSheets/ATmega48A-PA-88A-PA-168A-PA-328-P-DS-DS40002061B.pdf#page=22): RAMEND (which is 0x08FF)
-Steps to reproduce:
-1. Assemble the assembly code below: `avrasm2 -fI test.asm`
-
-    ```asm
-    ;; test.asm
-    .INCLUDE "m328Pdef.inc"
-
-    .EQU F_CPU = 16000000
-    .EQU BAUD_RATE = 9600
-    .EQU PRESCALE = (F_CPU / (16 * BAUD_RATE)) - 1
-
-    .CSEG
-    start:
-    	;; initialize USART (serial port)
-    	LDI R16, LOW(PRESCALE)
-    	LDI R17, HIGH(PRESCALE)
-    	STS UBRR0L, R16
-    	STS UBRR0H, R17
-    	LDI R16, (1 << RXEN0) | (1 << TXEN0)
-    	STS UCSR0B, R16
-
-    	;; Get stack pointer low byte and print it in ASCII
-    	IN R16, SPL
-    	LDI R17, 0x30
-    	ADD R16, R17
-    print1:
-    	LDS r17, UCSR0A
-    	SBRS r17, UDRE0
-    	RJMP print1
-    	STS UDR0, r16
-
-    	;; Get stack pointer high byte and print it in ASCII
-    	IN R16, SPH
-    	LDI R17, 0x30
-    	ADD R16, R17
-    print2:
-    	LDS r17, UCSR0A
-    	SBRS r17, UDRE0
-    	RJMP print2
-    	STS UDR0, r16
-
-    end:
-    	RJMP end
-    ```
-
-2. Convert it to bin file: `avr-objcopy --input-target=ihex --output-target=binary test.hex test.bin`
-
-3. Run it with QEMU: `qemu-system-avr -machine uno -bios test.bin -serial stdio`
-
-This should print 00 which means that the stack pointer is initialized to 0.
-Additional information:
-I examined the source code and I think that editing the function `avr_cpu_reset_hold` in `/target/avr/cpu.c` might fix this issue. This is my first time seeing QEMU source code, so I might be wrong, though.
-
-```c
-// in /target/avr/cpu.c line 70
-static void avr_cpu_reset_hold(Object *obj)
-{
-    // ...
-
-    env->rampD = 0;
-    env->rampX = 0;
-    env->rampY = 0;
-    env->rampZ = 0;
-    env->eind = 0;
-    env->sp = 0;    // <-- change this value in accordance with board type?
-
-    //...
-}
-```