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Re: [Qemu-arm] [PATCH v3 3/7] hw/arm: make bitbanded IO optional on ARM
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-arm] [PATCH v3 3/7] hw/arm: make bitbanded IO optional on ARM M Profile |
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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>
thanks
-- PMM
- [Qemu-arm] [PATCH v3 0/7] arm: add Cortex M0 CPU model and hex file loader, Stefan Hajnoczi, 2018/07/25
- [Qemu-arm] [PATCH v3 1/7] hw/arm: rename armv7m_load_kernel(), Stefan Hajnoczi, 2018/07/25
- [Qemu-arm] [PATCH v3 2/7] hw/arm: rename TYPE_ARMV7M to TYPE_ARM_M_PROFILE, Stefan Hajnoczi, 2018/07/25
- [Qemu-arm] [PATCH v3 3/7] hw/arm: make bitbanded IO optional on ARM M Profile, Stefan Hajnoczi, 2018/07/25
- [Qemu-arm] [PATCH v3 4/7] target/arm: add "cortex-m0" CPU model, Stefan Hajnoczi, 2018/07/25
- [Qemu-arm] [PATCH v3 5/7] loader: add rom transaction API, Stefan Hajnoczi, 2018/07/25
- [Qemu-arm] [PATCH v3 6/7] loader: Implement .hex file loader, Stefan Hajnoczi, 2018/07/25
- [Qemu-arm] [PATCH v3 7/7] Add QTest testcase for the Intel Hexadecimal, Stefan Hajnoczi, 2018/07/25