On 02/09/2017 05:34 PM, Bystricky, Juro wrote:
>> The code running on nios2 can issue unaligned access to the jtag uart
>> registers, yes ? If that happens, what happens on real HW and how is
>> this emulated ?
>
> Misaligned accesses to any registers would raise an exception.
> The exception is handled by interrupt controller, either "real"
> or emulated. Such access should never reach code for jtag uart.
>
> Also note we only allow access size 4 in the code:
>
> static const MemoryRegionOps juart_ops = {
> .read = altera_juart_read,
> .write = altera_juart_write,
> .endianness = DEVICE_LITTLE_ENDIAN,
> .valid = {
> .min_access_size = 4,
> .max_access_size = 4
> }
> };
This answers my question , thanks.
--
Best regards,
Marek Vasut
