Linux Kernel handling AXI DECERR/SLVERR

[Bharat Kumar Gogada]

On Tue, Dec 19, 2017 at 11:28:49AM +0000, Bharat Kumar Gogada wrote:
> In our case the peripheral returns SLVERR first time and we see the following print but kernel do not hang.
> [  231.484186] Unhandled fault: synchronous external abort 
> (0x92000210) at 0x0000007f9241f880 Bus error
> 
> And from simulation we know that subsequent access to peripheral 
> returns OKAY response, however we see subsequent access fail with same 
> above bus error when we boot Linux.
> 
> Is there a way to handle these synchronous abort gracefully in Linux 
> or are these fatal ?

We don't currently have any mechanism to handle these, though it might be possible for synchronous abort.
Since currently there is no mechanism to handle, if once synchronous abort is received from a peripheral,
consecutive access will show up same error even peripheral responds with OKAY ?
What are the possible ways for handling these ?

Do you know why the device is returning SLVERR in this case?
There is an error being detected by the device.

Bharat