Currently, after the rpmsg link up it will use mailbox
channel in blocking mode to send the notifications. So
it will be stuck in the notification when the remote side
unable to respond for some reason, such as crashed.
To avoid interlock, this patch changes the notifying to
timeout mode, and treats the virtqueue as broken when
the remote side doesn't respond within 1 second.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Add the rpmsg tty demo for iMX AMP platforms.
Use the "echo <string> > /dev/*RPMSG*", after insmod the module.
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
[ Aisheng: cope with tty_operations::write() change ]
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
- Enable the tx_block mechanism to make sure that every transmission is
complete when mailbox is used.
- Refine the data exchange in the rpmsg_rx_callback and some info
messages and codes comments.
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Based on "virtio_rpmsg_bus" driver, This patch-set is used to set up
the communication mechanism between A core and M core on i.MX AMP SOCs.
Add the initial imx rpmsg support glue driver and one pingpong demo,
demonstrated the data transactions between A core and remote M core.
Distributed framework is used in IMX RPMSG implementation, refer to the
following requirements:
- The CAN functions contained in M core and RTOS should be ready and
complete functional in 50ms after AMP system is turned on.
- Partition reset. System wouldn't be stalled by the exceptions (e.x
the reset triggered by the system hang) occurred at the other side.
And the RPMSG mechanism should be recovered automactilly after the
partition reset is completed.
In this scenario, the M core and RTOS would be kicked off by bootloader
firstly, then A core and Linux would be loaded later. Both M core/RTOS
and A core/Linux are running independly.
One physical memory region used to store the vring is mandatory required
to pre-reserved and well-knowned by both A core and M core
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
