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Re: [Qemu-devel] [PATCH v3 3/7] hw/arm: make bitbanded IO optional on AR

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v3 3/7] hw/arm: make bitbanded IO optional on ARM M Profile
Date: Mon, 30 Jul 2018 18:33:07 +0100

On 25 July 2018 at 09:59, Stefan Hajnoczi <address@hidden> wrote:
> Some ARM CPUs have bitbanded IO, a memory region that allows convenient
> bit access via 32-bit memory loads/stores.  This eliminates the need for
> read-modify-update instruction sequences.
> This patch makes this optional feature a ARMMProfile qdev property,
> allowing boards to choose whether they want bitbanding or not.
> Status of boards:
>  * iotkit (Cortex M33), no bitband
>  * mps2 (Cortex M3), bitband
>  * msf2 (Cortex M3), bitband
>  * stellaris (Cortex M3), bitband
>  * stm32f205 (Cortex M3), bitband
> Signed-off-by: Stefan Hajnoczi <address@hidden>

Reviewed-by: Peter Maydell <address@hidden>

-- PMM

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