Re: [PATCH] hw/avr/atmega.c: use the avr51 cpu for atmega1280

[Joaquin de Andres <me@xcancerberox.com.ar>]

On 4/28/21 9:17 PM, Philippe Mathieu-Daudé wrote:
> Cc'ing Joaquín.
>
> On 4/28/21 9:15 PM, Frederic Konrad wrote:
>> According to the as documentation:
>>  (https://sourceware.org/binutils/docs-2.36/as/AVR-Options.html)
>>
>> "Instruction set avr51 is for the enhanced AVR core with exactly 128K
>>  program memory space (MCU types: atmega128, atmega128a, atmega1280,
>>  atmega1281, atmega1284, atmega1284p, atmega128rfa1, atmega128rfr2,
>>  atmega1284rfr2, at90can128, at90usb1286, at90usb1287, m3000)."
>>
>> But when compiling a program for atmega1280 or avr51 and trying to execute
>> it:
>>
>> $ cat > test.S << EOF
>>> loop:
>>>     rjmp loop
>>> EOF
>> $ avr-gcc -nostdlib -nostartfiles -mmcu=atmega1280 test.S -o test.elf
>> $ qemu-system-avr -serial mon:stdio -nographic -no-reboot -M mega \
>>                   -bios test.elf
>> qemu-system-avr: Current machine: Arduino Mega (ATmega1280) with 'avr6' CPU
>> qemu-system-avr: ELF image 'test.elf' is for 'avr51' CPU
>>
>> So this fixes the atmega1280 class to use an avr51 CPU.
>>
>> Signed-off-by: Frederic Konrad <frederic.konrad@adacore.com>
>> ---
>>  hw/avr/atmega.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/hw/avr/atmega.c b/hw/avr/atmega.c
>> index 44c6afebbb..e3ea5702f5 100644
>> --- a/hw/avr/atmega.c
>> +++ b/hw/avr/atmega.c
>> @@ -402,7 +402,7 @@ static void atmega1280_class_init(ObjectClass *oc, void *data)
>>  {
>>      AtmegaMcuClass *amc = ATMEGA_MCU_CLASS(oc);
>>  
>> -    amc->cpu_type = AVR_CPU_TYPE_NAME("avr6");
>> +    amc->cpu_type = AVR_CPU_TYPE_NAME("avr51");
>>      amc->flash_size = 128 * KiB;
>>      amc->eeprom_size = 4 * KiB;
>>      amc->sram_size = 8 * KiB;
>>
>
Good catch!