Re: [PATCH V1 2/6] soc: qcom: dcc: Add driver support for Data Capture and Compare unit(DCC)

Bjorn Andersson
2021-03-11T16:34:54Z

On Thu 11 Mar 04:06 CST 2021, schowdhu@codeaurora.org wrote:

> On 2021-03-11 04:49, Bjorn Andersson wrote:
> > On Wed 10 Mar 10:46 CST 2021, Souradeep Chowdhury wrote:
> >
> > > The DCC is a DMA Engine designed to capture and store data
> > > during system crash or software triggers. The DCC operates
> > > based on link list entries which provides it with data and
> > > addresses and the function it needs to perform. These
> > > functions are read, write and loop. Added the basic driver
> > > in this patch which contains a probe method which instantiates
> > > the resources needed by the driver. DCC has it's own SRAM which
> > > needs to be instantiated at probe time as well.
> > >
> >
> > So to summarize, the DCC will upon a crash copy the configured region
> > into the dcc-ram, where it can be retrieved either by dumping the memory
> > over USB or from sysfs on the next boot?
>
> Replied by Sai
>

Thanks Souradeep and Sai, I'm definitely interested in learning more
about what the hardware block can do and how we can use it.

Regards,
Bjorn