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Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation
From: |
Marek Vasut |
Subject: |
Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation |
Date: |
Thu, 9 Feb 2017 18:25:16 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.4.0 |
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
- [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, (continued)
- [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Juro Bystricky, 2017/02/08
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Marek Vasut, 2017/02/08
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Peter Maydell, 2017/02/08
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Bystricky, Juro, 2017/02/08
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Marek Vasut, 2017/02/09
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Bystricky, Juro, 2017/02/09
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Marek Vasut, 2017/02/09
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Bystricky, Juro, 2017/02/09
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Marek Vasut, 2017/02/09
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation, Bystricky, Juro, 2017/02/09
- Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART emulation,
Marek Vasut <=